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关于ASSM HWM的研究

1.       测试基本脚本

create tablespace assm

datafile '/data1/oracle/oradata/assm01.dbf'

size 10M

extent management local uniform size 40K  ----这里对于不同size分别测试

segment space management auto

/

 

CREATE TABLE TEST_HWM1  (ID CHAR(2000), NAME CHAR(2000) )

Tablespace ASSM

STORAGE ( MINEXTENTS 2)  PCTFREE 40

/

 

 

select EXTENT_ID,FILE_ID,RELATIVE_FNO,BLOCK_ID,BLOCKS

from dba_extents

where segment_name='TEST_HWM1'

/

 

alter system dump datafile 7 block min 9 block max 11;

 

insert into test_hwm1 values('1','eeyglee');

commit;

 

alter system dump datafile 7 block min 9 block max 11;

 

drop tablespace assm including contents and datafiles;

 

2.       测试步骤

[oracle@jumper udump]$ sqlplus "/ as sysdba"

 

SQL*Plus: Release 9.2.0.3.0 - Production on Tue Jun 15 11:01:59 2004

 

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

 

 

Connected to:

Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

 

SQL> drop tablespace assm including contents and datafiles;

 

Tablespace dropped.

 

SQL> create tablespace assm

  2  datafile '/data1/oracle/oradata/assm01.dbf'

  3  size 10M

  4  extent management local uniform size 40K

  5  segment space management auto

  6  /

 

Tablespace created.

 

SQL> CREATE TABLE TEST_HWM1  (ID CHAR(2000), NAME CHAR(2000) )

  2  Tablespace ASSM

  3  STORAGE ( MINEXTENTS 2)  PCTFREE 40

  4  /

 

Table created.

 

SQL> select EXTENT_ID,FILE_ID,RELATIVE_FNO,BLOCK_ID,BLOCKS

  2  from dba_extents

  3  where segment_name='TEST_HWM1'

  4  /

 

 EXTENT_ID    FILE_ID RELATIVE_FNO   BLOCK_ID     BLOCKS

---------- ---------- ------------ ---------- ----------

         0          7            7          9          5

         1          7            7         14          5

 

SQL> ! vi a.sql

 

alter system dump datafile 7 block min 9 block max 11;

 

insert into test_hwm1 values('1','eeyglee');

commit;

 

alter system dump datafile 7 block min 9 block max 11;

~

"a.sql" [New] 6L, 165C written

 

SQL> set echo on

SQL> @a

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL>

SQL> insert into test_hwm1 values('1','eeyglee');

 

1 row created.

 

SQL> commit;

 

Commit complete.

 

SQL>

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL> !

[oracle@jumper udump]$ ls

a.sql  hsjf_ora_14222.trc

[oracle@jumper udump]$ more *.trc

/opt/oracle/admin/hsjf/udump/hsjf_ora_14222.trc

Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

ORACLE_HOME = /opt/oracle/product/9.2.0

System name:    Linux

Node name:      jumper.hurray.com.cn

Release:        2.4.18-14

Version:        #1 Wed Sep 4 13:35:50 EDT 2002

Machine:        i686

Instance name: hsjf

Redo thread mounted by this instance: 1

Oracle process number: 9

Unix process pid: 14222, image: oracle@jumper.hurray.com.cn (TNS V1-V3)

 

*** 2004-06-15 11:03:09.785

*** SESSION ID:(8.1436) 2004-06-15 11:03:09.784

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444b37 seq: 0x02 flg: 0x00 tail: 0x4b372002

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 2         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 7       total: 10        first useful block: 3     

   owning instance : 1

   instance ownership changed at

   Last successful Search

   Freeness Status:  nf1 0      nf2 0      nf3 0      nf4 0     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 3     

   Bitmap block lock opcode 3

   Locker xid:     :  0x000a.017.00000aec

      Highwater::  0x01c0000c  ext#: 0  blk#: 3  ext size: 5 ---HWM H0c = 12

  #blocks in seg. hdr's freelists: 0                          ---文件头 8

  #blocks below: 0                                      ---Metadata 3

  mapblk  0x00000000  offset: 0                         ---HWM = 8 + 3 + 1 = 12

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 5      Offset: 0     

   0x01c0000e  Length: 5      Offset: 5     

 

   0:Metadata   1:Metadata   2:Metadata   3:unformatted

   4:unformatted   5:unformatted   6:unformatted   7:unformatted

   8:unformatted   9:unformatted

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444b36 seq: 0x02 flg: 0x00 tail: 0x4b362102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 1       nfree: 1       ffree: 0      pdba:     0x01c0000b

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444b3a seq: 0x01 flg: 0x00 tail: 0x4b3a2301

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 10   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 5    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 5    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0     

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00009

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15685  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 5    

   0x01c0000e  length: 5    

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00009 Data dba:  0x01c0000e

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444b46 seq: 0x04 flg: 0x00 tail: 0x4b462004

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 2         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 5       total: 10        first useful block: 3     

   owning instance : 1

   instance ownership changed at 06/15/2004 11:03:09

   Last successful Search 06/15/2004 11:03:09

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 1     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 3     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c0000e  ext#: 0  blk#: 5  ext size: 5   HWM H0e = 14

  #blocks in seg. hdr's freelists: 0                             HWM = 8 + 3 + 2 +1 = 14

  #blocks below: 2    

  mapblk  0x00000000  offset: 0    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 5      Offset: 0     

   0x01c0000e  Length: 5      Offset: 5     

 

   0:Metadata   1:Metadata   2:Metadata   3:75-100% free      此处一次格式化

   4:25-50% free   5:unformatted   6:unformatted   7:unformatted  extents另外2block

   8:unformatted   9:unformatted

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444b36 seq: 0x02 flg: 0x00 tail: 0x4b362102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 1       nfree: 1       ffree: 0      pdba:     0x01c0000b

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444b46 seq: 0x01 flg: 0x00 tail: 0x4b462301

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 10   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c0000e  ext#: 0      blk#: 5      ext size: 5    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 2    

  mapblk  0x00000000  offset: 0    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 5    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0     

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00009

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15685  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 5    

   0x01c0000e  length: 5    

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00009 Data dba:  0x01c0000e

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

 

 

 

 

 

继续增加记录

[oracle@jumper udump]$ more hsjf_ora_16003.trc

/opt/oracle/admin/hsjf/udump/hsjf_ora_16003.trc

Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

ORACLE_HOME = /opt/oracle/product/9.2.0

System name:    Linux

Node name:      jumper.hurray.com.cn

Release:        2.4.18-14

Version:        #1 Wed Sep 4 13:35:50 EDT 2002

Machine:        i686

Instance name: hsjf

Redo thread mounted by this instance: 1

Oracle process number: 9

Unix process pid: 16003, image: oracle@jumper.hurray.com.cn (TNS V1-V3)

 

*** SESSION ID:(8.1438) 2004-06-15 11:14:10.331

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444c21 seq: 0x04 flg: 0x00 tail: 0x4c212004

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 2         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 0       total: 10        first useful block: 3     

   owning instance : 1

   instance ownership changed at 06/15/2004 11:14:07

   Last successful Search 06/15/2004 11:14:07

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 4     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 5     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c00013  ext#: 1      blk#: 5      ext size: 5    

  #blocks in seg. hdr's freelists: 0                       HWM = H13 = 19

  #blocks below: 7                                  HWM=19=8 + 3 + 2 + 5 + 1 =19

  mapblk  0x00000000  offset: 1    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 5      Offset: 0     

   0x01c0000e  Length: 5      Offset: 5     

                                                ---Oracle选择格式化第二个extents 5block

   0:Metadata   1:Metadata   2:Metadata   3:FULL        

   4:FULL   5:75-100% free   6:75-100% free   7:75-100% free

   8:75-100% free   9:25-50% free

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444b36 seq: 0x02 flg: 0x00 tail: 0x4b362102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 1       nfree: 1       ffree: 0      pdba:     0x01c0000b

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444c21 seq: 0x01 flg: 0x00 tail: 0x4c212301

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 10   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c00013  ext#: 1      blk#: 5      ext size: 5    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 7    

  mapblk  0x00000000  offset: 1    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 5    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0     

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00009

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15685  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 5    

   0x01c0000e  length: 5    

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00009 Data dba:  0x01c0000e

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

 

 

测试第二种情况:

 

[oracle@jumper udump]$ sqlplus "/as sysdba"

 

SQL*Plus: Release 9.2.0.3.0 - Production on Tue Jun 15 11:26:08 2004

 

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

 

 

Connected to:

Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

 

SQL> drop tablespace assm including contents and datafiles;

 

Tablespace dropped.

 

SQL> @a

SQL> create tablespace assm

  2  datafile '/data1/oracle/oradata/assm01.dbf'

  3  size 10M

  4  extent management local uniform size 64K

  5  segment space management auto

  6  /

 

Tablespace created.

 

SQL>

SQL> CREATE TABLE TEST_HWM1     (ID CHAR(2000), NAME CHAR(2000) )

  2  Tablespace ASSM

  3  STORAGE ( MINEXTENTS 2)  PCTFREE 40

  4  /

 

Table created.

 

SQL>

SQL>

SQL> select EXTENT_ID,FILE_ID,RELATIVE_FNO,BLOCK_ID,BLOCKS

  2  from dba_extents

  3  where segment_name='TEST_HWM1'

  4  /

 

 EXTENT_ID    FILE_ID RELATIVE_FNO   BLOCK_ID     BLOCKS

---------- ---------- ------------ ---------- ----------

         0          7            7          9          8

         1          7            7         17          8

 

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL>

SQL> insert into test_hwm1 values('1','eeyglee');

 

1 row created.

 

SQL> commit;

 

Commit complete.

 

SQL>

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL> exit

Disconnected from Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

[oracle@jumper udump]$ ls -sort

total 60

  16 -rw-r-----    1 oracle      15744  6 15 11:13 hsjf_ora_14222.trc

   4 -rw-r--r--    1 oracle        109  6 15 11:14 b.sql

  12 -rw-r-----    1 oracle      11888  6 15 11:14 hsjf_ora_16003.trc

   4 -rw-r--r--    1 oracle        546  6 15 11:22 a.sql

  12 -rw-r-----    1 oracle       8325  6 15 11:22 hsjf_ora_16983.trc

  12 -rw-r-----    1 oracle       8326  6 15 11:26 hsjf_ora_17568.trc

[oracle@jumper udump]$ more hsjf_ora_17568.trc

/opt/oracle/admin/hsjf/udump/hsjf_ora_17568.trc

Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

ORACLE_HOME = /opt/oracle/product/9.2.0

System name:    Linux

Node name:      jumper.hurray.com.cn

Release:        2.4.18-14

Version:        #1 Wed Sep 4 13:35:50 EDT 2002

Machine:        i686

Instance name: hsjf

Redo thread mounted by this instance: 1

Oracle process number: 10

Unix process pid: 17568, image: oracle@jumper.hurray.com.cn (TNS V1-V3)

 

*** SESSION ID:(11.587) 2004-06-15 11:26:20.196

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444d6b seq: 0x02 flg: 0x00 tail: 0x4d6b2002

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 2         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 13      total: 16        first useful block: 3     

   owning instance : 1

   instance ownership changed at

   Last successful Search

   Freeness Status:  nf1 0      nf2 0      nf3 0      nf4 0     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 3     

   Bitmap block lock opcode 3

   Locker xid:     :  0x0009.020.00000aca

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 8      Offset: 0     

   0x01c00011  Length: 8      Offset: 8     

 

   0:Metadata   1:Metadata   2:Metadata   3:unformatted

   4:unformatted   5:unformatted   6:unformatted   7:unformatted

   8:unformatted   9:unformatted   10:unformatted   11:unformatted

   12:unformatted   13:unformatted   14:unformatted   15:unformatted

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444d6a seq: 0x02 flg: 0x00 tail: 0x4d6a2102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 1       nfree: 1       ffree: 0      pdba:     0x01c0000b

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444d6e seq: 0x01 flg: 0x00 tail: 0x4d6e2301

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 16   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0     

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00009

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15687  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 8    

   0x01c00011  length: 8    

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00009 Data dba:  0x01c00011

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444d71 seq: 0x04 flg: 0x00 tail: 0x4d712004

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 2         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 8       total: 16        first useful block: 3     

   owning instance : 1

   instance ownership changed at 06/15/2004 11:26:20

   Last successful Search 06/15/2004 11:26:20

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 4     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 3     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c00011  ext#: 0      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 5    

  mapblk  0x00000000  offset: 0    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 8      Offset: 0     

   0x01c00011  Length: 8      Offset: 8     

 

   0:Metadata   1:Metadata   2:Metadata   3:25-50% free  --5block被格式化

   4:75-100% free   5:75-100% free   6:75-100% free   7:75-100% free

   8:unformatted   9:unformatted   10:unformatted   11:unformatted

   12:unformatted   13:unformatted   14:unformatted   15:unformatted

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444d6a seq: 0x02 flg: 0x00 tail: 0x4d6a2102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 1       nfree: 1       ffree: 0      pdba:     0x01c0000b

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444d71 seq: 0x01 flg: 0x00 tail: 0x4d712301

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 16   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c00011  ext#: 0      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 5    

  mapblk  0x00000000  offset: 0    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0      

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00009

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15687  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 8    

   0x01c00011  length: 8    

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00009 Data dba:  0x01c00011

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

 

[oracle@jumper udump]$ sqlplus "/ as sysdba"

 

SQL*Plus: Release 9.2.0.3.0 - Production on Tue Jun 15 11:29:14 2004

 

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

 

 

Connected to:

Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

 

SQL> @b

SQL> insert into test_hwm1 values('1','eeyglee');

 

1 row created.

 

SQL> commit;

 

Commit complete.

 

SQL>

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL> @b

SQL> set echo on

SQL> insert into test_hwm1 values('1','eeyglee');

 

1 row created.

 

SQL> commit;

 

Commit complete.

 

SQL>

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL> @b

SQL> set echo on

SQL> insert into test_hwm1 values('1','eeyglee');

 

1 row created.

 

SQL> commit;

 

Commit complete.

 

SQL>

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL> @b

SQL> set echo on

SQL> insert into test_hwm1 values('1','eeyglee');

 

1 row created.

 

SQL> commit;

 

Commit complete.

 

SQL>

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL> @b

SQL> set echo on

SQL> insert into test_hwm1 values('1','eeyglee');

 

1 row created.

 

SQL> commit;

 

Commit complete.

 

SQL>

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL> @b

SQL> set echo on

SQL> insert into test_hwm1 values('1','eeyglee');

 

1 row created.

 

SQL> commit;

 

Commit complete.

 

SQL>

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL> !

[oracle@jumper udump]$ ls -sort

total 84

  16 -rw-r-----    1 oracle      15744  6 15 11:13 hsjf_ora_14222.trc

  12 -rw-r-----    1 oracle      11888  6 15 11:14 hsjf_ora_16003.trc

   4 -rw-r--r--    1 oracle        546  6 15 11:22 a.sql

  12 -rw-r-----    1 oracle       8325  6 15 11:22 hsjf_ora_16983.trc

  12 -rw-r-----    1 oracle       8326  6 15 11:26 hsjf_ora_17568.trc

   4 -rw-r--r--    1 oracle        121  6 15 11:29 b.sql

  24 -rw-r-----    1 oracle      23800  6 15 11:29 hsjf_ora_18039.trc

[oracle@jumper udump]$ more hsjf_ora_18039.trc

/opt/oracle/admin/hsjf/udump/hsjf_ora_18039.trc

Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

ORACLE_HOME = /opt/oracle/product/9.2.0

System name:    Linux

Node name:      jumper.hurray.com.cn

Release:        2.4.18-14

Version:        #1 Wed Sep 4 13:35:50 EDT 2002

Machine:        i686

Instance name: hsjf

Redo thread mounted by this instance: 1

Oracle process number: 10

Unix process pid: 18039, image: oracle@jumper.hurray.com.cn (TNS V1-V3)

 

*** SESSION ID:(11.591) 2004-06-15 11:29:15.312

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444dab seq: 0x02 flg: 0x00 tail: 0x4dab2002

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 2         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 8       total: 16        first useful block: 3     

   owning instance : 1

   instance ownership changed at 06/15/2004 11:26:20

   Last successful Search 06/15/2004 11:26:20

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 3     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 4     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c00011  ext#: 0      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 5    

  mapblk  0x00000000  offset: 0    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 8      Offset: 0     

   0x01c00011  Length: 8      Offset: 8     

 

   0:Metadata   1:Metadata   2:Metadata   3:FULL

   4:75-100% free   5:75-100% free   6:25-50% free   7:75-100% free

   8:unformatted   9:unformatted   10:unformatted   11:unformatted

   12:unformatted   13:unformatted   14:unformatted   15:unformatted

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444d6a seq: 0x02 flg: 0x00 tail: 0x4d6a2102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 1       nfree: 1       ffree: 0      pdba:     0x01c0000b

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444d71 seq: 0x01 flg: 0x00 tail: 0x4d712301

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 16   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c00011  ext#: 0      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 5    

  mapblk  0x00000000  offset: 0    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0     

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00009

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15687  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 8    

   0x01c00011  length: 8    

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00009 Data dba:  0x01c00011

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444dad seq: 0x02 flg: 0x00 tail: 0x4dad2002

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 2         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 8       total: 16        first useful block: 3     

   owning instance : 1

   instance ownership changed at 06/15/2004 11:26:20

   Last successful Search 06/15/2004 11:26:20

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 2     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 4     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c00011  ext#: 0      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 5    

  mapblk  0x00000000  offset: 0    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 8      Offset: 0     

   0x01c00011  Length: 8      Offset: 8     

 

   0:Metadata   1:Metadata   2:Metadata   3:FULL

   4:75-100% free   5:75-100% free   6:FULL   7:25-50% free

   8:unformatted   9:unformatted   10:unformatted   11:unformatted

   12:unformatted   13:unformatted   14:unformatted   15:unformatted

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444d6a seq: 0x02 flg: 0x00 tail: 0x4d6a2102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 1       nfree: 1       ffree: 0      pdba:     0x01c0000b

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444d71 seq: 0x01 flg: 0x00 tail: 0x4d712301

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 16   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c00011  ext#: 0      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 5    

  mapblk  0x00000000  offset: 0    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0     

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00009

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15687  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 8    

   0x01c00011  length: 8    

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00009 Data dba:  0x01c00011

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444daf seq: 0x02 flg: 0x00 tail: 0x4daf2002

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 2         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 8       total: 16        first useful block: 3     

   owning instance : 1

   instance ownership changed at 06/15/2004 11:26:20

   Last successful Search 06/15/2004 11:26:20

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 1     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 4     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c00011  ext#: 0      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0     

  #blocks below: 5    

  mapblk  0x00000000  offset: 0    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 8      Offset: 0      

   0x01c00011  Length: 8      Offset: 8     

 

   0:Metadata   1:Metadata   2:Metadata   3:FULL

   4:25-50% free   5:75-100% free   6:FULL   7:FULL

   8:unformatted   9:unformatted   10:unformatted   11:unformatted

   12:unformatted   13:unformatted   14:unformatted   15:unformatted

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444d6a seq: 0x02 flg: 0x00 tail: 0x4d6a2102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 1       nfree: 1       ffree: 0      pdba:     0x01c0000b

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444d71 seq: 0x01 flg: 0x00 tail: 0x4d712301

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 16   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c00011  ext#: 0      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 5    

  mapblk  0x00000000  offset: 0    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0     

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00009

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15687  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 8    

   0x01c00011  length: 8    

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00009 Data dba:  0x01c00011

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444db1 seq: 0x02 flg: 0x00 tail: 0x4db12002

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 2         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 8       total: 16        first useful block: 3     

   owning instance : 1

   instance ownership changed at 06/15/2004 11:26:20

   Last successful Search 06/15/2004 11:26:20

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 0     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 5     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c00011  ext#: 0      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 5    

  mapblk  0x00000000  offset: 0    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 8      Offset: 0     

   0x01c00011  Length: 8      Offset: 8     

 

   0:Metadata   1:Metadata   2:Metadata   3:FULL

   4:FULL   5:25-50% free   6:FULL   7:FULL

   8:unformatted   9:unformatted   10:unformatted   11:unformatted

   12:unformatted   13:unformatted   14:unformatted   15:unformatted

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444d6a seq: 0x02 flg: 0x00 tail: 0x4d6a2102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 1       nfree: 1       ffree: 0      pdba:     0x01c0000b

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444d71 seq: 0x01 flg: 0x00 tail: 0x4d712301

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 16   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c00011  ext#: 0      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 5    

  mapblk  0x00000000  offset: 0    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0     

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00009

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15687  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 8    

   0x01c00011  length: 8    

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00009 Data dba:  0x01c00011

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444db3 seq: 0x04 flg: 0x00 tail: 0x4db32004

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 2         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 0       total: 16        first useful block: 3     

   owning instance : 1

   instance ownership changed at 06/15/2004 11:29:19

   Last successful Search 06/15/2004 11:29:19

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 7     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 8     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c00019  ext#: 1      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 13   

  mapblk  0x00000000  offset: 1    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 8      Offset: 0     

   0x01c00011  Length: 8      Offset: 8     

 

   0:Metadata   1:Metadata   2:Metadata   3:FULL  --格式化第二个extetns8block

   4:FULL   5:FULL   6:FULL   7:FULL

   8:75-100% free   9:75-100% free   10:25-50% free   11:75-100% free

   12:75-100% free   13:75-100% free   14:75-100% free   15:75-100% free

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444d6a seq: 0x02 flg: 0x00 tail: 0x4d6a2102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 1       nfree: 1       ffree: 0      pdba:     0x01c0000b

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444db3 seq: 0x01 flg: 0x00 tail: 0x4db32301

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 16   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c00019  ext#: 1      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 13   

  mapblk  0x00000000  offset: 1    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0     

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0     

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00009

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15687  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 8    

   0x01c00011  length: 8    

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00009 Data dba:  0x01c00011

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444db5 seq: 0x02 flg: 0x00 tail: 0x4db52002

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 2         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 0       total: 16        first useful block: 3      

   owning instance : 1

   instance ownership changed at 06/15/2004 11:29:19

   Last successful Search 06/15/2004 11:29:19

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 6     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 8     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c00019  ext#: 1      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 13   

  mapblk  0x00000000  offset: 1     

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 8      Offset: 0     

   0x01c00011  Length: 8      Offset: 8     

 

   0:Metadata   1:Metadata   2:Metadata   3:FULL

   4:FULL   5:FULL   6:FULL   7:FULL

   8:75-100% free   9:75-100% free   10:FULL   11:25-50% free

   12:75-100% free   13:75-100% free   14:75-100% free   15:75-100% free

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444d6a seq: 0x02 flg: 0x00 tail: 0x4d6a2102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 1       nfree: 1       ffree: 0      pdba:     0x01c0000b

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444db3 seq: 0x01 flg: 0x00 tail: 0x4db32301

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 16   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c00019  ext#: 1      blk#: 8      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 13   

  mapblk  0x00000000  offset: 1    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 8    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0      

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00009

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15687  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 8    

   0x01c00011  length: 8    

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00009 Data dba:  0x01c00011

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

 

 

 

第三种情况

 

[oracle@jumper udump]$ sqlplus "/ as sysdba"

 

SQL*Plus: Release 9.2.0.3.0 - Production on Tue Jun 15 11:34:15 2004

 

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

 

 

Connected to:

Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

 

SQL> @a

SQL> drop tablespace assm including contents and datafiles;

 

Tablespace dropped.

 

SQL> create tablespace assm

  2  datafile '/data1/oracle/oradata/assm01.dbf'

  3  size 10M

  4  extent management local uniform size 128K

  5  segment space management auto

  6  /

 

Tablespace created.

 

SQL>

SQL> CREATE TABLE TEST_HWM1     (ID CHAR(2000), NAME CHAR(2000) )

  2  Tablespace ASSM

  3  STORAGE ( MINEXTENTS 2)  PCTFREE 40

  4  /

 

Table created.

 

SQL>

SQL>

SQL> select EXTENT_ID,FILE_ID,RELATIVE_FNO,BLOCK_ID,BLOCKS

  2  from dba_extents

  3  where segment_name='TEST_HWM1'

  4  /

 

 EXTENT_ID    FILE_ID RELATIVE_FNO   BLOCK_ID     BLOCKS

---------- ---------- ------------ ---------- ----------

         0          7            7          9         16

         1          7            7         25         16

 

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL>

SQL> insert into test_hwm1 values('1','eeyglee');

 

1 row created.

 

SQL> commit;

 

Commit complete.

 

SQL>

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL> !

[oracle@jumper udump]$ ls

a.sql  hsjf_ora_14222.trc  hsjf_ora_16983.trc  hsjf_ora_18039.trc

b.sql  hsjf_ora_16003.trc  hsjf_ora_17568.trc  hsjf_ora_18807.trc

[oracle@jumper udump]$ ls -sort

total 96

  16 -rw-r-----    1 oracle      15744  6 15 11:13 hsjf_ora_14222.trc

  12 -rw-r-----    1 oracle      11888  6 15 11:14 hsjf_ora_16003.trc

  12 -rw-r-----    1 oracle       8325  6 15 11:22 hsjf_ora_16983.trc

  12 -rw-r-----    1 oracle       8326  6 15 11:26 hsjf_ora_17568.trc

   4 -rw-r--r--    1 oracle        121  6 15 11:29 b.sql

  24 -rw-r-----    1 oracle      23800  6 15 11:29 hsjf_ora_18039.trc

   4 -rw-r--r--    1 oracle        602  6 15 11:34 a.sql

  12 -rw-r-----    1 oracle       8305  6 15 11:34 hsjf_ora_18807.trc

[oracle@jumper udump]$ more hsjf_ora_18807.trc

/opt/oracle/admin/hsjf/udump/hsjf_ora_18807.trc

Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

ORACLE_HOME = /opt/oracle/product/9.2.0

System name:    Linux

Node name:      jumper.hurray.com.cn

Release:        2.4.18-14

Version:        #1 Wed Sep 4 13:35:50 EDT 2002

Machine:        i686

Instance name: hsjf

Redo thread mounted by this instance: 1

Oracle process number: 11

Unix process pid: 18807, image: oracle@jumper.hurray.com.cn (TNS V1-V3)

 

*** SESSION ID:(9.116) 2004-06-15 11:34:19.132

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444e3e seq: 0x02 flg: 0x00 tail: 0x4e3e2002

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 1         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 13      total: 16        first useful block: 3     

   owning instance : 1

   instance ownership changed at

   Last successful Search

   Freeness Status:  nf1 0      nf2 0      nf3 0      nf4 0     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 3     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 16   

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 16     Offset: 0     

 

   0:Metadata   1:Metadata   2:Metadata   3:unformatted

   4:unformatted   5:unformatted   6:unformatted   7:unformatted

   8:unformatted   9:unformatted   10:unformatted   11:unformatted

   12:unformatted   13:unformatted   14:unformatted   15:unformatted

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444e3f seq: 0x02 flg: 0x00 tail: 0x4e3f2102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 2       nfree: 2       ffree: 0      pdba:     0x01c0000b

  opcode:1

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

   0x01c00019  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444e42 seq: 0x01 flg: 0x00 tail: 0x4e422301

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 32   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 16   

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c0000c  ext#: 0      blk#: 3      ext size: 16   

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0     

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00019

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15688  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 16   

   0x01c00019  length: 16   

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00019 Data dba:  0x01c0001a

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444e45 seq: 0x03 flg: 0x00 tail: 0x4e452003

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 1         parent dba:  0x01c0000a   poffset: 0    

   unformatted: 0       total: 16        first useful block: 3     

   owning instance : 1

   instance ownership changed at 06/15/2004 11:34:19

   Last successful Search 06/15/2004 11:34:19

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 12    

 

   Extent Map Block Offset: 4294967295

   First free datablock : 3     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c00019  ext#: 0      blk#: 16     ext size: 16   

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 13   

  mapblk  0x00000000  offset: 0    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 16     Offset: 0     

                                             --一次格式化13block,第一个exntets

   0:Metadata   1:Metadata   2:Metadata   3:75-100% free   

   4:75-100% free   5:75-100% free   6:75-100% free   7:75-100% free

   8:75-100% free   9:75-100% free   10:75-100% free   11:75-100% free

   12:75-100% free   13:75-100% free   14:25-50% free   15:75-100% free

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444e3f seq: 0x02 flg: 0x00 tail: 0x4e3f2102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 2       nfree: 2       ffree: 0      pdba:     0x01c0000b

  opcode:1

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

   0x01c00019  Free: 5 Inst: 1

 

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444e45 seq: 0x02 flg: 0x00 tail: 0x4e452302

frmt: 0x02 chkval: 0x0000 type: 0x23=PAGETABLE SEGMENT HEADER

  Extent Control Header

  -----------------------------------------------------------------

  Extent Header:: spare1: 0      spare2: 0      #extents: 2      #blocks: 32   

                  last map  0x00000000  #maps: 0      offset: 2716 

      Highwater::  0x01c00019  ext#: 0      blk#: 16     ext size: 16   

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 13   

  mapblk  0x00000000  offset: 0    

                   Unlocked

  --------------------------------------------------------

  Low HighWater Mark :

      Highwater::  0x01c00019  ext#: 0      blk#: 16     ext size: 16   

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 13   

  mapblk  0x00000000  offset: 0    

  Level 1 BMB for High HWM block: 0x01c00009

  Level 1 BMB for Low HWM block: 0x01c00009

  --------------------------------------------------------

  Segment Type: 1 nl2: 1      blksz: 8192   fbsz: 0     

  L2 Array start offset:  0x00001434

  First Level 3 BMB:  0x00000000

  L2 Hint for inserts:  0x01c0000a

  Last Level 1 BMB:  0x01c00019

  Last Level II BMB:  0x01c0000a

  Last Level III BMB:  0x00000000

     Map Header:: next  0x00000000  #extents: 2    obj#: 15688  flag: 0x20000000

  Extent Map

  -----------------------------------------------------------------

   0x01c00009  length: 16   

   0x01c00019  length: 16   

 

  Auxillary Map

  --------------------------------------------------------

   Extent 0     :  L1 dba:  0x01c00009 Data dba:  0x01c0000c

   Extent 1     :  L1 dba:  0x01c00019 Data dba:  0x01c0001a

  --------------------------------------------------------

 

   Second Level Bitmap block DBAs

   --------------------------------------------------------

   DBA 1:   0x01c0000a

 

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

 

再测试J

[oracle@jumper udump]$ sqlplus "/ as sysdba"

 

SQL*Plus: Release 9.2.0.3.0 - Production on Tue Jun 15 11:37:12 2004

 

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

 

 

Connected to:

Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

 

SQL> @a

SQL> drop tablespace assm including contents and datafiles;

 

Tablespace dropped.

 

SQL> create tablespace assm

  2  datafile '/data1/oracle/oradata/assm01.dbf'

  3  size 10M

  4  extent management local uniform size 256K

  5  segment space management auto

  6  /

 

Tablespace created.

 

SQL>

SQL> CREATE TABLE TEST_HWM1     (ID CHAR(2000), NAME CHAR(2000) )

  2  Tablespace ASSM

  3  STORAGE ( MINEXTENTS 2)  PCTFREE 40

  4  /

 

Table created.

 

SQL>

SQL>

SQL> select EXTENT_ID,FILE_ID,RELATIVE_FNO,BLOCK_ID,BLOCKS

  2  from dba_extents

  3  where segment_name='TEST_HWM1'

  4  /

 

 EXTENT_ID    FILE_ID RELATIVE_FNO   BLOCK_ID     BLOCKS

---------- ---------- ------------ ---------- ----------

         0          7            7          9         32

         1          7            7         41         32

 

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL>

SQL> insert into test_hwm1 values('1','eeyglee');

 

1 row created.

 

SQL> commit;

 

Commit complete.

 

SQL>

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

SQL> !

[oracle@jumper udump]$ ls -sort

total 104

  16 -rw-r-----    1 oracle      15744  6 15 11:13 hsjf_ora_14222.trc

  12 -rw-r-----    1 oracle      11888  6 15 11:14 hsjf_ora_16003.trc

  12 -rw-r-----    1 oracle       8325  6 15 11:22 hsjf_ora_16983.trc

  12 -rw-r-----    1 oracle       8326  6 15 11:26 hsjf_ora_17568.trc

   4 -rw-r--r--    1 oracle        121  6 15 11:29 b.sql

  24 -rw-r-----    1 oracle      23800  6 15 11:29 hsjf_ora_18039.trc

  12 -rw-r-----    1 oracle       8305  6 15 11:34 hsjf_ora_18807.trc

   4 -rw-r--r--    1 oracle        602  6 15 11:37 a.sql

   8 -rw-r-----    1 oracle       7410  6 15 11:37 hsjf_ora_19159.trc

[oracle@jumper udump]$ more hsjf_ora_19159.trc

/opt/oracle/admin/hsjf/udump/hsjf_ora_19159.trc

Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

ORACLE_HOME = /opt/oracle/product/9.2.0

System name:    Linux

Node name:      jumper.hurray.com.cn

Release:        2.4.18-14

Version:        #1 Wed Sep 4 13:35:50 EDT 2002

Machine:        i686

Instance name: hsjf

Redo thread mounted by this instance: 1

Oracle process number: 11

Unix process pid: 19159, image: oracle@jumper.hurray.com.cn (TNS V1-V3)

 

*** SESSION ID:(9.118) 2004-06-15 11:37:16.067

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444ea9 seq: 0x02 flg: 0x00 tail: 0x4ea92002

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 1         parent dba:  0x01c0000b   poffset: 0    

   unformatted: 12      total: 16        first useful block: 4     

   owning instance : 1

   instance ownership changed at

   Last successful Search

   Freeness Status:  nf1 0      nf2 0      nf3 0      nf4 0     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 4     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c0000d  ext#: 0      blk#: 4      ext size: 32   

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 16     Offset: 0     

 

   0:Metadata   1:Metadata   2:Metadata   3:Metadata

   4:unformatted   5:unformatted   6:unformatted   7:unformatted

   8:unformatted   9:unformatted   10:unformatted   11:unformatted

   12:unformatted   13:unformatted   14:unformatted   15:unformatted

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444ea9 seq: 0x02 flg: 0x00 tail: 0x4ea92002

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 1         parent dba:  0x01c0000b   poffset: 1    

   unformatted: 16      total: 16        first useful block: 0     

   owning instance : 1

   instance ownership changed at

   Last successful Search

   Freeness Status:  nf1 0      nf2 0      nf3 0      nf4 0     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 0     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x00000000  ext#: 0      blk#: 0      ext size: 0    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  HWM Flag: Not Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00019  Length: 16     Offset: 0     

 

   0:unformatted   1:unformatted   2:unformatted   3:unformatted

   4:unformatted   5:unformatted   6:unformatted   7:unformatted

   8:unformatted   9:unformatted   10:unformatted   11:unformatted

   12:unformatted   13:unformatted   14:unformatted   15:unformatted

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444eac seq: 0x02 flg: 0x00 tail: 0x4eac2102

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 4       nfree: 4       ffree: 0      pdba:     0x01c0000c

  opcode:1

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

   0x01c0000a  Free: 5 Inst: 1

   0x01c00029  Free: 5 Inst: 1

   0x01c0002a  Free: 5 Inst: 1

 

  --------------------------------------------------------

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444eb2 seq: 0x02 flg: 0x00 tail: 0x4eb22002

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 1         parent dba:  0x01c0000b   poffset: 0    

   unformatted: 12      total: 16        first useful block: 4     

   owning instance : 1

   instance ownership changed at

   Last successful Search

   Freeness Status:  nf1 0      nf2 0      nf3 0      nf4 0     

 

   Extent Map Block Offset: 4294967295

   First free datablock : 4     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x00000000  ext#: 0      blk#: 0      ext size: 0    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  HWM Flag: Not Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 16     Offset: 0     

 

   0:Metadata   1:Metadata   2:Metadata   3:Metadata

   4:unformatted   5:unformatted   6:unformatted   7:unformatted

   8:unformatted   9:unformatted   10:unformatted   11:unformatted

   12:unformatted   13:unformatted   14:unformatted   15:unformatted

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444eb2 seq: 0x03 flg: 0x00 tail: 0x4eb22003

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 1         parent dba:  0x01c0000b   poffset: 1    

   unformatted: 0       total: 16        first useful block: 0     

   owning instance : 1

   instance ownership changed at 06/15/2004 11:37:16

   Last successful Search 06/15/2004 11:37:16

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 15    

 

   Extent Map Block Offset: 4294967295

   First free datablock : 0     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c00029  ext#: 0      blk#: 32     ext size: 32   

  #blocks in seg. hdr's freelists: 0       HWM=H29 = 41

  #blocks below: 28                  HWM= 16 + 16 + 8 + 1= 41

  mapblk  0x00000000  offset: 0      注意此HWM下包含了未格式化的block

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00019  Length: 16     Offset: 0      ---此处一次格式化16block

                                          ---这是一次格式化的最大值

   0:75-100% free   1:75-100% free   2:75-100% free   3:75-100% free

   4:75-100% free   5:75-100% free   6:75-100% free   7:75-100% free

   8:75-100% free   9:75-100% free   10:75-100% free   11:25-50% free

   12:75-100% free   13:75-100% free   14:75-100% free   15:75-100% free

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444eb2 seq: 0x01 flg: 0x00 tail: 0x4eb22101

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 4       nfree: 4       ffree: 0      pdba:     0x01c0000c

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

   0x01c0000a  Free: 5 Inst: 1

   0x01c00029  Free: 5 Inst: 1

   0x01c0002a  Free: 5 Inst: 1

 

  --------------------------------------------------------

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

 

继续插入数据

 

SQL> @b

SQL> set echo on

SQL> insert into test_hwm1 values('1','eeyglee');

 

1 row created.

 

SQL> commit;

 

Commit complete.

 

SQL>

SQL> alter system dump datafile 7 block min 9 block max 11;

 

System altered.

 

[oracle@jumper udump]$ more hsjf_ora_20288.trc

/opt/oracle/admin/hsjf/udump/hsjf_ora_20288.trc

Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.3.0 - Production

ORACLE_HOME = /opt/oracle/product/9.2.0

System name:    Linux

Node name:      jumper.hurray.com.cn

Release:        2.4.18-14

Version:        #1 Wed Sep 4 13:35:50 EDT 2002

Machine:        i686

Instance name: hsjf

Redo thread mounted by this instance: 1

Oracle process number: 12

Unix process pid: 20288, image: oracle@jumper.hurray.com.cn (TNS V1-V3)

 

*** SESSION ID:(13.32) 2004-06-15 11:44:38.947

Start dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

buffer tsn: 16 rdba: 0x01c00009 (7/9)

scn: 0x0000.01444f44 seq: 0x02 flg: 0x00 tail: 0x4f442002

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 1         parent dba:  0x01c0000b   poffset: 0    

   unformatted: 0       total: 16        first useful block: 4     

   owning instance : 1

   instance ownership changed at 06/15/2004 11:44:37

   Last successful Search 06/15/2004 11:44:37

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 11    

 

   Extent Map Block Offset: 4294967295

   First free datablock : 4     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x00000000  ext#: 0      blk#: 0      ext size: 0    

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 0    

  mapblk  0x00000000  offset: 0    

  HWM Flag: Not Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00009  Length: 16     Offset: 0     

 

   0:Metadata   1:Metadata   2:Metadata   3:Metadata

   4:25-50% free   5:75-100% free   6:75-100% free   7:75-100% free

   8:75-100% free   9:75-100% free   10:75-100% free   11:75-100% free

   12:75-100% free   13:75-100% free   14:75-100% free   15:75-100% free

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000a (7/10)

scn: 0x0000.01444eb2 seq: 0x03 flg: 0x00 tail: 0x4eb22003

frmt: 0x02 chkval: 0x0000 type: 0x20=FIRST LEVEL BITMAP BLOCK

Dump of First Level Bitmap Block

 --------------------------------

   nbits : 4 nranges: 1         parent dba:  0x01c0000b   poffset: 1    

   unformatted: 0       total: 16        first useful block: 0     

   owning instance : 1

   instance ownership changed at 06/15/2004 11:37:16

   Last successful Search 06/15/2004 11:37:16

   Freeness Status:  nf1 0      nf2 1      nf3 0      nf4 15    

 

   Extent Map Block Offset: 4294967295

   First free datablock : 0     

   Bitmap block lock opcode 0

   Locker xid:     :  0x0000.000.00000000

      Highwater::  0x01c00029  ext#: 0      blk#: 32     ext size: 32   

  #blocks in seg. hdr's freelists: 0    

  #blocks below: 28   

  mapblk  0x00000000  offset: 0    

  HWM Flag: HWM Set

  --------------------------------------------------------

  DBA Ranges :

  --------------------------------------------------------

   0x01c00019  Length: 16     Offset: 0     

 

   0:75-100% free   1:75-100% free   2:75-100% free   3:75-100% free

   4:75-100% free   5:75-100% free   6:75-100% free   7:75-100% free

   8:75-100% free   9:75-100% free   10:75-100% free   11:25-50% free

   12:75-100% free   13:75-100% free   14:75-100% free   15:75-100% free

  --------------------------------------------------------

buffer tsn: 16 rdba: 0x01c0000b (7/11)

scn: 0x0000.01444eb2 seq: 0x01 flg: 0x00 tail: 0x4eb22101

frmt: 0x02 chkval: 0x0000 type: 0x21=SECOND LEVEL BITMAP BLOCK

Dump of Second Level Bitmap Block

   number: 4       nfree: 4       ffree: 0      pdba:     0x01c0000c

  opcode:0

 xid:

  L1 Ranges :

  --------------------------------------------------------

   0x01c00009  Free: 5 Inst: 1

   0x01c0000a  Free: 5 Inst: 1

   0x01c00029  Free: 5 Inst: 1

   0x01c0002a  Free: 5 Inst: 1

 

  --------------------------------------------------------

End dump data blocks tsn: 16 file#: 7 minblk 9 maxblk 11

 

 

3.       结论

 

对于 extents <= 16 blocks

HWM 移动遵循:

1----à extent blocks – metadata

2----à extent blocks

 

对于 extents > 16 blocks

HWM移动遵循:

每次移动32blocks,但是HWM包含未格式化的block,每次格式化16block或者16 –metadata blocks


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无觅

By eygle on 2004-06-15 09:45 | Comments (1) | Internal | 9 |

1 Comment


这个Highwater:: 0x01c0000e 的值是16进制的吧
这个值怎么算出来的
SELECT TO_NUMBER('01c0000e','XXXXXXXX') FROM DUAL
应该不是这样的吧。


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