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« _disable_logging对于性能的影响 | Blog首页 | Oracle9i到10g,空闲等待事件的变化 »

_disable_logging如何禁用日志

在非归档模式下(归档模式会导致日志损坏),使用_disable_logging可以禁止日志的生成,从而可以提高某些特殊操作(如批量加载或Benchmark测试等)的性能.

我们可以来看一下这个禁止是如何完成的.

启动2个Session,一个用于管理,一个用于测试.

1.Session 1 ,使用SYS用户连接数据库,当前_disable_logging未设置,数据库处于正常状态

$ sqlplus "/ as sysdba"

SQL*Plus: Release 9.2.0.4.0 - Production on Fri Apr 14 09:30:42 2006

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


Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production

SQL> col member for a40
SQL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER
---------- ------- ------- ----------------------------------------
1 ONLINE /opt/oracle9/oradata/testora9/redo01.log
2 ONLINE /opt/oracle9/oradata/testora9/redo02.log
3 ONLINE /opt/oracle9/oradata/testora9/redo03.log

SQL> alter system switch logfile;

System altered.

SQL> select * from v$log;

GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 148 104857600 1 NO CURRENT 262708457 14-APR-06
2 1 146 104857600 1 NO INACTIVE 262662667 14-APR-06
3 1 147 104857600 1 NO ACTIVE 262675537 14-APR-06

2.Session2通过SCOTT用户连接,执行如下更新:

SQL> connect scott/tiger
Connected.

SQL> update emp set sal=3000 where empno=7788;

1 row updated.

SQL> commit;

Commit complete.

3.在Session转储REDO日志

SQL> ALTER SYSTEM DUMP LOGFILE '/opt/oracle9/oradata/testora9/redo01.log';

System altered.

4.观察跟踪文件,记录正常状态下的REDO信息

$ ls
testora9_ora_16037.trc
$ cat *
/opt/oracle9/admin/testora9/udump/testora9_ora_16037.trc
Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production
ORACLE_HOME = /opt/oracle9/product/9.2.0
System name: SunOS
Node name: testdbserver.hurray.com.cn
Release: 5.8
Version: Generic_108528-25
Machine: sun4u
Instance name: testora9
Redo thread mounted by this instance: 1
Oracle process number: 15
Unix process pid: 16037, image: oracle@testdbserver.hurray.com.cn (TNS V1-V3)

*** 2006-04-14 09:32:01.356
*** SESSION ID:(17.3524) 2006-04-14 09:32:01.340

DUMP OF REDO FROM FILE '/opt/oracle9/oradata/testora9/redo01.log'
Opcodes *.*
DBA's: (file # 0, block # 0) thru (file # 65534, block # 4194303)
RBA's: 0x000000.00000000.0000 thru 0xffffffff.ffffffff.ffff
SCN's scn: 0x0000.00000000 thru scn: 0xffff.ffffffff
Times: creation thru eternity
FILE HEADER:
Software vsn=153092096=0x9200000, Compatibility Vsn=153092096=0x9200000
Db ID=1628068176=0x610a5950, Db Name='TESTORA9'
Activation ID=1628067152=0x610a5550
Control Seq=1161=0x489, File size=204800=0x32000
File Number=1, Blksiz=512, File Type=2 LOG
descrip:"Thread 0001, Seq# 0000000148, SCN 0x00000fa89ce9-0xffffffffffff"
thread: 1 nab: 0xffffffff seq: 0x00000094 hws: 0x1 eot: 1 dis: 0
reset logs count: 0x1f435110 scn: 0x0000.00000001
Low scn: 0x0000.0fa89ce9 04/14/2006 09:31:06
Next scn: 0xffff.ffffffff 01/01/1988 00:00:00
Enabled scn: 0x0000.00000001 04/26/2004 15:56:10
Thread closed scn: 0x0000.0fa89ce9 04/14/2006 09:31:06
Log format vsn: 0x8000000 Disk cksum: 0x9930 Calc cksum: 0x9930
Terminal Recovery Stamp scn: 0x0000.00000000 01/01/1988 00:00:00
Most recent redo scn: 0x0000.00000000
Largest LWN: 0 blocks
End-of-redo stream : No
Unprotected mode
Miscellaneous flags: 0x0

REDO RECORD - Thread:1 RBA: 0x000094.00000002.0010 LEN: 0x01b0 VLD: 0x01
SCN: 0x0000.0fa89cf0 SUBSCN: 1 04/14/2006 09:31:30
CHANGE #1 TYP:0 CLS:33 AFN:2 DBA:0x00800089 SCN:0x0000.0fa89cca SEQ: 1 OP:5.2
ktudh redo: slt: 0x000f sqn: 0x00009c89 flg: 0x000a siz: 132 fbi: 0
uba: 0x00800559.0352.01 pxid: 0x0000.000.00000000
CHANGE #2 TYP:1 CLS:34 AFN:2 DBA:0x00800559 SCN:0x0000.0fa89cf0 SEQ: 1 OP:5.1
ktudb redo: siz: 132 spc: 0 flg: 0x000a seq: 0x0352 rec: 0x01
xid: 0x0009.00f.00009c89
ktubl redo: slt: 15 rci: 0 opc: 11.1 objn: 30359 objd: 30359 tsn: 0
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x00800558.0352.57
prev ctl max cmt scn: 0x0000.0fa89887 prev tx cmt scn: 0x0000.0fa8988b
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0005.01e.00009810 uba: 0x00800615.032f.26
flg: C--- lkc: 0 scn: 0x0000.0f92af59
KDO Op code: URP row dependencies Disabled
xtype: XA bdba: 0x0040a482 hdba: 0x0040a481
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 7(0x7) flag: 0x2c lock: 0 ckix: 0
ncol: 8 nnew: 1 size: 0
col 5: [ 2] c2 29
CHANGE #3 TYP:2 CLS: 1 AFN:1 DBA:0x0040a482 SCN:0x0000.0f92ced1 SEQ: 1 OP:11.5
KTB Redo
op: 0x11 ver: 0x01
op: F xid: 0x0009.00f.00009c89 uba: 0x00800559.0352.01
Block cleanout record, scn: 0x0000.0fa89cf0 ver: 0x01 opt: 0x02, entries follow...
itli: 2 flg: 2 scn: 0x0000.0f92ced1
KDO Op code: URP row dependencies Disabled
xtype: XA bdba: 0x0040a482 hdba: 0x0040a481
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 7(0x7) flag: 0x2c lock: 1 ckix: 0
ncol: 8 nnew: 1 size: 0
col 5: [ 2] c2 1f
CHANGE #4 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ: 0 OP:5.20
session number = 16
serial number = 651
transaction name =

REDO RECORD - Thread:1 RBA: 0x000094.00000002.01c0 LEN: 0x0054 VLD: 0x01
SCN: 0x0000.0fa89cf1 SUBSCN: 1 04/14/2006 09:31:30
CHANGE #1 TYP:0 CLS:33 AFN:2 DBA:0x00800089 SCN:0x0000.0fa89cf0 SEQ: 1 OP:5.4
ktucm redo: slt: 0x000f sqn: 0x00009c89 srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x00800559.0352.01 ext: 2 spc: 8016 fbi: 0

REDO RECORD - Thread:1 RBA: 0x000094.00000004.0010 LEN: 0x01f4 VLD: 0x01
SCN: 0x0000.0fa89cf2 SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:21 AFN:2 DBA:0x00800029 SCN:0x0000.0fa89ccc SEQ: 1 OP:5.2
ktudh redo: slt: 0x001b sqn: 0x00009c9b flg: 0x0012 siz: 108 fbi: 0
uba: 0x0080046b.0345.40 pxid: 0x0000.000.00000000
CHANGE #2 TYP:0 CLS:22 AFN:2 DBA:0x0080046b SCN:0x0000.0fa89ccb SEQ: 1 OP:5.1
ktudb redo: siz: 108 spc: 2908 flg: 0x0012 seq: 0x0345 rec: 0x40
xid: 0x0003.01b.00009c9b
ktubl redo: slt: 27 rci: 0 opc: 11.1 objn: 3643 objd: 3643 tsn: 0
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x0080046b.0345.3f
prev ctl max cmt scn: 0x0000.0fa89888 prev tx cmt scn: 0x0000.0fa8988d
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0002.021.0000a088 uba: 0x0080091e.0714.47
flg: C--- lkc: 0 scn: 0x0000.0fa89ce0
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f7a hdba: 0x00401f79
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 0 to: 0
CHANGE #3 TYP:2 CLS: 1 AFN:1 DBA:0x00401f7a SCN:0x0000.0fa89ce3 SEQ: 1 OP:11.4
KTB Redo
op: 0x11 ver: 0x01
op: F xid: 0x0003.01b.00009c9b uba: 0x0080046b.0345.40
Block cleanout record, scn: 0x0000.0fa89cf2 ver: 0x01 opt: 0x02, entries follow...
itli: 1 flg: 2 scn: 0x0000.0fa89ce0
itli: 2 flg: 2 scn: 0x0000.0fa89ce3
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f7a hdba: 0x00401f79
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 0 to: 1
CHANGE #4 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ: 0 OP:5.19
session number = 8
serial number = 1
current username = SYS
login username =
client info =
OS username = oracle9
Machine name = testdbserver.hurray.com.cn
OS terminal = UNKNOWN
OS process id = 2053
OS program name = oracle@testdbserver.hurray.com.cn (QMN0)
transaction name =

REDO RECORD - Thread:1 RBA: 0x000094.00000005.0014 LEN: 0x00dc VLD: 0x01
SCN: 0x0000.0fa89cf2 SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:22 AFN:2 DBA:0x0080046b SCN:0x0000.0fa89cf2 SEQ: 1 OP:5.1
ktudb redo: siz: 84 spc: 2798 flg: 0x0022 seq: 0x0345 rec: 0x41
xid: 0x0003.01b.00009c9b
ktubu redo: slt: 27 rci: 64 opc: 11.1 objn: 3635 objd: 3635 tsn: 0
Undo type: Regular undo Undo type: Last buffer split: No
Tablespace Undo: No
0x00000000
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0008.01b.00009c85 uba: 0x008007a3.037e.0b
flg: C--- lkc: 0 scn: 0x0000.0fa89ce3
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 0 to: 0
CHANGE #2 TYP:2 CLS: 1 AFN:1 DBA:0x00401f3a SCN:0x0000.0fa89ce5 SEQ: 1 OP:11.4
KTB Redo
op: 0x01 ver: 0x01
op: F xid: 0x0003.01b.00009c9b uba: 0x0080046b.0345.41
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 0 to: 1

REDO RECORD - Thread:1 RBA: 0x000094.00000005.00f0 LEN: 0x0054 VLD: 0x01
SCN: 0x0000.0fa89cf3 SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:21 AFN:2 DBA:0x00800029 SCN:0x0000.0fa89cf2 SEQ: 1 OP:5.4
ktucm redo: slt: 0x001b sqn: 0x00009c9b srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x0080046b.0345.41 ext: 2 spc: 2712 fbi: 0

REDO RECORD - Thread:1 RBA: 0x000094.00000006.0010 LEN: 0x0188 VLD: 0x01
SCN: 0x0000.0fa89cf5 SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:27 AFN:2 DBA:0x00800059 SCN:0x0000.0fa89ccd SEQ: 1 OP:5.2
ktudh redo: slt: 0x0020 sqn: 0x00009c72 flg: 0x0012 siz: 108 fbi: 0
uba: 0x0080027b.0352.1d pxid: 0x0000.000.00000000
CHANGE #2 TYP:0 CLS:28 AFN:2 DBA:0x0080027b SCN:0x0000.0fa89ccc SEQ: 1 OP:5.1
ktudb redo: siz: 108 spc: 5718 flg: 0x0012 seq: 0x0352 rec: 0x1d
xid: 0x0006.020.00009c72
ktubl redo: slt: 32 rci: 0 opc: 11.1 objn: 3635 objd: 3635 tsn: 0
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x0080027b.0352.1c
prev ctl max cmt scn: 0x0000.0fa8988a prev tx cmt scn: 0x0000.0fa8988e
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0002.01a.0000a089 uba: 0x0080091e.0714.49
flg: C--- lkc: 0 scn: 0x0000.0fa89ce5
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 2 ispac: 0 maxfr: 4863
tabn: 0 slot: 0 to: 0
CHANGE #3 TYP:2 CLS: 1 AFN:1 DBA:0x00401f3a SCN:0x0000.0fa89cf3 SEQ: 1 OP:11.4
KTB Redo
op: 0x11 ver: 0x01
op: F xid: 0x0006.020.00009c72 uba: 0x0080027b.0352.1d
Block cleanout record, scn: 0x0000.0fa89cf5 ver: 0x01 opt: 0x02, entries follow...
itli: 1 flg: 2 scn: 0x0000.0fa89cf3
itli: 2 flg: 2 scn: 0x0000.0fa89ce5
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 2 ispac: 0 maxfr: 4863
tabn: 0 slot: 0 to: 2
CHANGE #4 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ: 0 OP:5.20
session number = 8
serial number = 1
transaction name =

REDO RECORD - Thread:1 RBA: 0x000094.00000006.0198 LEN: 0x0054 VLD: 0x01
SCN: 0x0000.0fa89cf6 SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:27 AFN:2 DBA:0x00800059 SCN:0x0000.0fa89cf5 SEQ: 1 OP:5.4
ktucm redo: slt: 0x0020 sqn: 0x00009c72 srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x0080027b.0352.1d ext: 2 spc: 5608 fbi: 0

REDO RECORD - Thread:1 RBA: 0x000094.00000007.0010 LEN: 0x00d4 VLD: 0x01
SCN: 0x0000.0fa89cf7 SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:33 AFN:2 DBA:0x00800089 SCN:0x0000.0fa89cf1 SEQ: 1 OP:5.2
ktudh redo: slt: 0x0027 sqn: 0x00009c88 flg: 0x0011 siz: 52 fbi: 0
uba: 0x00800559.0352.02 pxid: 0x0000.000.00000000
CHANGE #2 TYP:0 CLS:34 AFN:2 DBA:0x00800559 SCN:0x0000.0fa89cf0 SEQ: 2 OP:5.1
ktudb redo: siz: 52 spc: 8016 flg: 0x0012 seq: 0x0352 rec: 0x02
xid: 0x0009.027.00009c88
ktubl redo: slt: 39 rci: 0 opc: 5.7 objn: 0 objd: 0 tsn: 0
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x00800559.0352.01
prev ctl max cmt scn: 0x0000.0fa8988b prev tx cmt scn: 0x0000.0fa89894
CHANGE #3 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ: 0 OP:5.20
session number = 8
serial number = 1
transaction name =

REDO RECORD - Thread:1 RBA: 0x000094.00000007.00e4 LEN: 0x0118 VLD: 0x01
SCN: 0x0000.0fa89cf8 SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:33 AFN:2 DBA:0x00800089 SCN:0x0000.0fa89cf7 SEQ: 1 OP:5.2
ktudh redo: slt: 0x0027 sqn: 0x00000000 flg: 0x0002 siz: 84 fbi: 0
uba: 0x00800559.0352.03 pxid: 0x0000.000.00000000
CHANGE #2 TYP:0 CLS:34 AFN:2 DBA:0x00800559 SCN:0x0000.0fa89cf7 SEQ: 1 OP:5.1
ktudb redo: siz: 84 spc: 7962 flg: 0x0022 seq: 0x0352 rec: 0x03
xid: 0x0009.027.00009c88
ktubu redo: slt: 39 rci: 0 opc: 11.1 objn: 3643 objd: 3643 tsn: 0
Undo type: Regular undo Undo type: Last buffer split: No
Tablespace Undo: No
0x00000000
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0008.01b.00009c85 uba: 0x008007a3.037e.0a
flg: C--- lkc: 0 scn: 0x0000.0fa89ce3
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f7a hdba: 0x00401f79
itli: 2 ispac: 0 maxfr: 4863
tabn: 0 slot: 1 to: 0
CHANGE #3 TYP:2 CLS: 1 AFN:1 DBA:0x00401f7a SCN:0x0000.0fa89cf3 SEQ: 1 OP:11.4
KTB Redo
op: 0x01 ver: 0x01
op: F xid: 0x0009.027.00009c88 uba: 0x00800559.0352.03
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f7a hdba: 0x00401f79
itli: 2 ispac: 0 maxfr: 4863
tabn: 0 slot: 1 to: 2

REDO RECORD - Thread:1 RBA: 0x000094.00000008.0010 LEN: 0x00dc VLD: 0x01
SCN: 0x0000.0fa89cf8 SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:34 AFN:2 DBA:0x00800559 SCN:0x0000.0fa89cf8 SEQ: 1 OP:5.1
ktudb redo: siz: 84 spc: 7876 flg: 0x0022 seq: 0x0352 rec: 0x04
xid: 0x0009.027.00009c88
ktubu redo: slt: 39 rci: 3 opc: 11.1 objn: 3635 objd: 3635 tsn: 0
Undo type: Regular undo Undo type: Last buffer split: No
Tablespace Undo: No
0x00000000
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0003.01b.00009c9b uba: 0x0080046b.0345.41
flg: C--- lkc: 0 scn: 0x0000.0fa89cf3
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 1 to: 0
CHANGE #2 TYP:2 CLS: 1 AFN:1 DBA:0x00401f3a SCN:0x0000.0fa89cf6 SEQ: 1 OP:11.4
KTB Redo
op: 0x01 ver: 0x01
op: F xid: 0x0009.027.00009c88 uba: 0x00800559.0352.04
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 1 to: 1

REDO RECORD - Thread:1 RBA: 0x000094.00000008.00ec LEN: 0x0054 VLD: 0x01
SCN: 0x0000.0fa89cf9 SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:33 AFN:2 DBA:0x00800089 SCN:0x0000.0fa89cf8 SEQ: 1 OP:5.4
ktucm redo: slt: 0x0027 sqn: 0x00009c88 srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x00800559.0352.04 ext: 2 spc: 7790 fbi: 0

REDO RECORD - Thread:1 RBA: 0x000094.00000008.0140 LEN: 0x0188 VLD: 0x01
SCN: 0x0000.0fa89cfa SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:21 AFN:2 DBA:0x00800029 SCN:0x0000.0fa89cf3 SEQ: 1 OP:5.2
ktudh redo: slt: 0x001a sqn: 0x00009c9b flg: 0x0012 siz: 108 fbi: 0
uba: 0x0080046b.0345.42 pxid: 0x0000.000.00000000
CHANGE #2 TYP:0 CLS:22 AFN:2 DBA:0x0080046b SCN:0x0000.0fa89cf2 SEQ: 2 OP:5.1
ktudb redo: siz: 108 spc: 2712 flg: 0x0012 seq: 0x0345 rec: 0x42
xid: 0x0003.01a.00009c9b
ktubl redo: slt: 26 rci: 0 opc: 11.1 objn: 3635 objd: 3635 tsn: 0
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x0080046b.0345.40
prev ctl max cmt scn: 0x0000.0fa8988d prev tx cmt scn: 0x0000.0fa898e6
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0006.020.00009c72 uba: 0x0080027b.0352.1d
flg: C--- lkc: 0 scn: 0x0000.0fa89cf6
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 2 ispac: 0 maxfr: 4863
tabn: 0 slot: 1 to: 0
CHANGE #3 TYP:2 CLS: 1 AFN:1 DBA:0x00401f3a SCN:0x0000.0fa89cf9 SEQ: 1 OP:11.4
KTB Redo
op: 0x11 ver: 0x01
op: F xid: 0x0003.01a.00009c9b uba: 0x0080046b.0345.42
Block cleanout record, scn: 0x0000.0fa89cfa ver: 0x01 opt: 0x02, entries follow...
itli: 1 flg: 2 scn: 0x0000.0fa89cf9
itli: 2 flg: 2 scn: 0x0000.0fa89cf6
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 2 ispac: 0 maxfr: 4863
tabn: 0 slot: 1 to: 2
CHANGE #4 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ: 0 OP:5.20
session number = 8
serial number = 1
transaction name =

REDO RECORD - Thread:1 RBA: 0x000094.00000009.00d8 LEN: 0x0054 VLD: 0x01
SCN: 0x0000.0fa89cfb SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:21 AFN:2 DBA:0x00800029 SCN:0x0000.0fa89cfa SEQ: 1 OP:5.4
ktucm redo: slt: 0x001a sqn: 0x00009c9b srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x0080046b.0345.42 ext: 2 spc: 2602 fbi: 0

REDO RECORD - Thread:1 RBA: 0x000094.00000009.012c LEN: 0x00d4 VLD: 0x01
SCN: 0x0000.0fa89cfb SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:27 AFN:2 DBA:0x00800059 SCN:0x0000.0fa89cf6 SEQ: 1 OP:5.2
ktudh redo: slt: 0x000c sqn: 0x00009c72 flg: 0x0011 siz: 52 fbi: 0
uba: 0x0080027b.0352.1e pxid: 0x0000.000.00000000
CHANGE #2 TYP:0 CLS:28 AFN:2 DBA:0x0080027b SCN:0x0000.0fa89cf5 SEQ: 1 OP:5.1
ktudb redo: siz: 52 spc: 5608 flg: 0x0012 seq: 0x0352 rec: 0x1e
xid: 0x0006.00c.00009c72
ktubl redo: slt: 12 rci: 0 opc: 5.7 objn: 0 objd: 0 tsn: 0
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x0080027b.0352.1d
prev ctl max cmt scn: 0x0000.0fa8988e prev tx cmt scn: 0x0000.0fa89902
CHANGE #3 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ: 0 OP:5.20
session number = 8
serial number = 1
transaction name =

REDO RECORD - Thread:1 RBA: 0x000094.0000000a.0010 LEN: 0x0148 VLD: 0x01
SCN: 0x0000.0fa89cfb SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:27 AFN:2 DBA:0x00800059 SCN:0x0000.0fa89cfb SEQ: 1 OP:5.2
ktudh redo: slt: 0x000c sqn: 0x00000000 flg: 0x0002 siz: 84 fbi: 0
uba: 0x0080027b.0352.1f pxid: 0x0000.000.00000000
CHANGE #2 TYP:0 CLS:28 AFN:2 DBA:0x0080027b SCN:0x0000.0fa89cfb SEQ: 1 OP:5.1
ktudb redo: siz: 84 spc: 5554 flg: 0x0022 seq: 0x0352 rec: 0x1f
xid: 0x0006.00c.00009c72
ktubu redo: slt: 12 rci: 0 opc: 11.1 objn: 3643 objd: 3643 tsn: 0
Undo type: Regular undo Undo type: Last buffer split: No
Tablespace Undo: No
0x00000000
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0003.01b.00009c9b uba: 0x0080046b.0345.40
flg: C--- lkc: 0 scn: 0x0000.0fa89cf3
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f7a hdba: 0x00401f79
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 2 to: 0
CHANGE #3 TYP:2 CLS: 1 AFN:1 DBA:0x00401f7a SCN:0x0000.0fa89cf9 SEQ: 1 OP:11.4
KTB Redo
op: 0x11 ver: 0x01
op: F xid: 0x0006.00c.00009c72 uba: 0x0080027b.0352.1f
Block cleanout record, scn: 0x0000.0fa89cfb ver: 0x01 opt: 0x02, entries follow...
itli: 1 flg: 2 scn: 0x0000.0fa89cf3
itli: 2 flg: 2 scn: 0x0000.0fa89cf9
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f7a hdba: 0x00401f79
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 2 to: 1

REDO RECORD - Thread:1 RBA: 0x000094.0000000a.0158 LEN: 0x00dc VLD: 0x01
SCN: 0x0000.0fa89cfb SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:28 AFN:2 DBA:0x0080027b SCN:0x0000.0fa89cfb SEQ: 2 OP:5.1
ktudb redo: siz: 84 spc: 5468 flg: 0x0022 seq: 0x0352 rec: 0x20
xid: 0x0006.00c.00009c72
ktubu redo: slt: 12 rci: 31 opc: 11.1 objn: 3635 objd: 3635 tsn: 0
Undo type: Regular undo Undo type: Last buffer split: No
Tablespace Undo: No
0x00000000
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0009.027.00009c88 uba: 0x00800559.0352.04
flg: C--- lkc: 0 scn: 0x0000.0fa89cf9
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 2 to: 0
CHANGE #2 TYP:2 CLS: 1 AFN:1 DBA:0x00401f3a SCN:0x0000.0fa89cfb SEQ: 1 OP:11.4
KTB Redo
op: 0x01 ver: 0x01
op: F xid: 0x0006.00c.00009c72 uba: 0x0080027b.0352.20
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 2 to: 1

REDO RECORD - Thread:1 RBA: 0x000094.0000000b.0044 LEN: 0x0054 VLD: 0x01
SCN: 0x0000.0fa89cfc SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:27 AFN:2 DBA:0x00800059 SCN:0x0000.0fa89cfb SEQ: 2 OP:5.4
ktucm redo: slt: 0x000c sqn: 0x00009c72 srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x0080027b.0352.20 ext: 2 spc: 5382 fbi: 0

REDO RECORD - Thread:1 RBA: 0x000094.0000000b.0098 LEN: 0x0188 VLD: 0x01
SCN: 0x0000.0fa89cfd SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:33 AFN:2 DBA:0x00800089 SCN:0x0000.0fa89cf9 SEQ: 1 OP:5.2
ktudh redo: slt: 0x000d sqn: 0x00009c89 flg: 0x0012 siz: 108 fbi: 0
uba: 0x00800559.0352.05 pxid: 0x0000.000.00000000
CHANGE #2 TYP:0 CLS:34 AFN:2 DBA:0x00800559 SCN:0x0000.0fa89cf8 SEQ: 2 OP:5.1
ktudb redo: siz: 108 spc: 7790 flg: 0x0012 seq: 0x0352 rec: 0x05
xid: 0x0009.00d.00009c89
ktubl redo: slt: 13 rci: 0 opc: 11.1 objn: 3635 objd: 3635 tsn: 0
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x00800559.0352.02
prev ctl max cmt scn: 0x0000.0fa89894 prev tx cmt scn: 0x0000.0fa89905
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0003.01a.00009c9b uba: 0x0080046b.0345.42
flg: C--- lkc: 0 scn: 0x0000.0fa89cfb
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 2 ispac: 0 maxfr: 4863
tabn: 0 slot: 2 to: 0
CHANGE #3 TYP:2 CLS: 1 AFN:1 DBA:0x00401f3a SCN:0x0000.0fa89cfc SEQ: 1 OP:11.4
KTB Redo
op: 0x11 ver: 0x01
op: F xid: 0x0009.00d.00009c89 uba: 0x00800559.0352.05
Block cleanout record, scn: 0x0000.0fa89cfd ver: 0x01 opt: 0x02, entries follow...
itli: 1 flg: 2 scn: 0x0000.0fa89cfc
itli: 2 flg: 2 scn: 0x0000.0fa89cfb
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 2 ispac: 0 maxfr: 4863
tabn: 0 slot: 2 to: 2
CHANGE #4 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ: 0 OP:5.20
session number = 8
serial number = 1
transaction name =

REDO RECORD - Thread:1 RBA: 0x000094.0000000c.0030 LEN: 0x0054 VLD: 0x01
SCN: 0x0000.0fa89cfe SUBSCN: 1 04/14/2006 09:31:31
CHANGE #1 TYP:0 CLS:33 AFN:2 DBA:0x00800089 SCN:0x0000.0fa89cfd SEQ: 1 OP:5.4
ktucm redo: slt: 0x000d sqn: 0x00009c89 srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x00800559.0352.05 ext: 2 spc: 7680 fbi: 0

REDO RECORD - Thread:1 RBA: 0x000094.0000000d.0010 LEN: 0x00d4 VLD: 0x01
SCN: 0x0000.0fa89cff SUBSCN: 1 04/14/2006 09:31:37
CHANGE #1 TYP:0 CLS:21 AFN:2 DBA:0x00800029 SCN:0x0000.0fa89cfb SEQ: 1 OP:5.2
ktudh redo: slt: 0x0017 sqn: 0x00009c9c flg: 0x0011 siz: 52 fbi: 0
uba: 0x0080046b.0345.43 pxid: 0x0000.000.00000000
CHANGE #2 TYP:0 CLS:22 AFN:2 DBA:0x0080046b SCN:0x0000.0fa89cfa SEQ: 1 OP:5.1
ktudb redo: siz: 52 spc: 2602 flg: 0x0012 seq: 0x0345 rec: 0x43
xid: 0x0003.017.00009c9c
ktubl redo: slt: 23 rci: 0 opc: 5.7 objn: 0 objd: 0 tsn: 0
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x0080046b.0345.42
prev ctl max cmt scn: 0x0000.0fa898e6 prev tx cmt scn: 0x0000.0fa89907
CHANGE #3 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ: 0 OP:5.20
session number = 8
serial number = 1
transaction name =

REDO RECORD - Thread:1 RBA: 0x000094.0000000d.00e4 LEN: 0x0118 VLD: 0x01
SCN: 0x0000.0fa89cff SUBSCN: 1 04/14/2006 09:31:37
CHANGE #1 TYP:0 CLS:21 AFN:2 DBA:0x00800029 SCN:0x0000.0fa89cff SEQ: 1 OP:5.2
ktudh redo: slt: 0x0017 sqn: 0x00000000 flg: 0x0002 siz: 84 fbi: 0
uba: 0x0080046b.0345.44 pxid: 0x0000.000.00000000
CHANGE #2 TYP:0 CLS:22 AFN:2 DBA:0x0080046b SCN:0x0000.0fa89cff SEQ: 1 OP:5.1
ktudb redo: siz: 84 spc: 2548 flg: 0x0022 seq: 0x0345 rec: 0x44
xid: 0x0003.017.00009c9c
ktubu redo: slt: 23 rci: 0 opc: 11.1 objn: 3643 objd: 3643 tsn: 0
Undo type: Regular undo Undo type: Last buffer split: No
Tablespace Undo: No
0x00000000
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0009.027.00009c88 uba: 0x00800559.0352.03
flg: C--- lkc: 0 scn: 0x0000.0fa89cf9
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f7a hdba: 0x00401f79
itli: 2 ispac: 0 maxfr: 4863
tabn: 0 slot: 3 to: 0
CHANGE #3 TYP:2 CLS: 1 AFN:1 DBA:0x00401f7a SCN:0x0000.0fa89cfc SEQ: 1 OP:11.4
KTB Redo
op: 0x01 ver: 0x01
op: F xid: 0x0003.017.00009c9c uba: 0x0080046b.0345.44
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f7a hdba: 0x00401f79
itli: 2 ispac: 0 maxfr: 4863
tabn: 0 slot: 3 to: 2

REDO RECORD - Thread:1 RBA: 0x000094.0000000e.0010 LEN: 0x00dc VLD: 0x01
SCN: 0x0000.0fa89cff SUBSCN: 1 04/14/2006 09:31:37
CHANGE #1 TYP:0 CLS:22 AFN:2 DBA:0x0080046b SCN:0x0000.0fa89cff SEQ: 2 OP:5.1
ktudb redo: siz: 84 spc: 2462 flg: 0x0022 seq: 0x0345 rec: 0x45
xid: 0x0003.017.00009c9c
ktubu redo: slt: 23 rci: 68 opc: 11.1 objn: 3635 objd: 3635 tsn: 0
Undo type: Regular undo Undo type: Last buffer split: No
Tablespace Undo: No
0x00000000
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0006.00c.00009c72 uba: 0x0080027b.0352.20
flg: C--- lkc: 0 scn: 0x0000.0fa89cfc
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 3 to: 0
CHANGE #2 TYP:2 CLS: 1 AFN:1 DBA:0x00401f3a SCN:0x0000.0fa89cfe SEQ: 1 OP:11.4
KTB Redo
op: 0x01 ver: 0x01
op: F xid: 0x0003.017.00009c9c uba: 0x0080046b.0345.45
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 1 ispac: 0 maxfr: 4863
tabn: 0 slot: 3 to: 1

REDO RECORD - Thread:1 RBA: 0x000094.0000000e.00ec LEN: 0x0054 VLD: 0x01
SCN: 0x0000.0fa89d00 SUBSCN: 1 04/14/2006 09:31:37
CHANGE #1 TYP:0 CLS:21 AFN:2 DBA:0x00800029 SCN:0x0000.0fa89cff SEQ: 2 OP:5.4
ktucm redo: slt: 0x0017 sqn: 0x00009c9c srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x0080046b.0345.45 ext: 2 spc: 2376 fbi: 0

REDO RECORD - Thread:1 RBA: 0x000094.0000000e.0140 LEN: 0x0188 VLD: 0x01
SCN: 0x0000.0fa89d01 SUBSCN: 1 04/14/2006 09:31:37
CHANGE #1 TYP:0 CLS:27 AFN:2 DBA:0x00800059 SCN:0x0000.0fa89cfc SEQ: 1 OP:5.2
ktudh redo: slt: 0x001f sqn: 0x00009c72 flg: 0x0012 siz: 108 fbi: 0
uba: 0x0080027b.0352.21 pxid: 0x0000.000.00000000
CHANGE #2 TYP:0 CLS:28 AFN:2 DBA:0x0080027b SCN:0x0000.0fa89cfb SEQ: 3 OP:5.1
ktudb redo: siz: 108 spc: 5382 flg: 0x0012 seq: 0x0352 rec: 0x21
xid: 0x0006.01f.00009c72
ktubl redo: slt: 31 rci: 0 opc: 11.1 objn: 3635 objd: 3635 tsn: 0
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x0080027b.0352.1e
prev ctl max cmt scn: 0x0000.0fa89902 prev tx cmt scn: 0x0000.0fa89908
KDO undo record:
KTB Redo
op: 0x04 ver: 0x01
op: L itl: xid: 0x0009.00d.00009c89 uba: 0x00800559.0352.05
flg: C--- lkc: 0 scn: 0x0000.0fa89cfe
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 2 ispac: 0 maxfr: 4863
tabn: 0 slot: 3 to: 0
CHANGE #3 TYP:2 CLS: 1 AFN:1 DBA:0x00401f3a SCN:0x0000.0fa89d00 SEQ: 1 OP:11.4
KTB Redo
op: 0x11 ver: 0x01
op: F xid: 0x0006.01f.00009c72 uba: 0x0080027b.0352.21
Block cleanout record, scn: 0x0000.0fa89d01 ver: 0x01 opt: 0x02, entries follow...
itli: 1 flg: 2 scn: 0x0000.0fa89d00
itli: 2 flg: 2 scn: 0x0000.0fa89cfe
KDO Op code: LKR row dependencies Disabled
xtype: XA bdba: 0x00401f3a hdba: 0x00401f39
itli: 2 ispac: 0 maxfr: 4863
tabn: 0 slot: 3 to: 2
CHANGE #4 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ: 0 OP:5.20
session number = 8
serial number = 1
transaction name =

REDO RECORD - Thread:1 RBA: 0x000094.0000000f.00d8 LEN: 0x0054 VLD: 0x01
SCN: 0x0000.0fa89d02 SUBSCN: 1 04/14/2006 09:31:37
CHANGE #1 TYP:0 CLS:27 AFN:2 DBA:0x00800059 SCN:0x0000.0fa89d01 SEQ: 1 OP:5.4
ktucm redo: slt: 0x001f sqn: 0x00009c72 srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x0080027b.0352.21 ext: 2 spc: 5272 fbi: 0

REDO RECORD - Thread:1 RBA: 0x000094.0000000f.012c LEN: 0x00d4 VLD: 0x01
SCN: 0x0000.0fa89d02 SUBSCN: 1 04/14/2006 09:31:37
CHANGE #1 TYP:0 CLS:33 AFN:2 DBA:0x00800089 SCN:0x0000.0fa89cfe SEQ: 1 OP:5.2
ktudh redo: slt: 0x0028 sqn: 0x00009c88 flg: 0x0011 siz: 52 fbi: 0
uba: 0x00800559.0352.06 pxid: 0x0000.000.00000000
CHANGE #2 TYP:0 CLS:34 AFN:2 DBA:0x00800559 SCN:0x0000.0fa89cfd SEQ: 1 OP:5.1
ktudb redo: siz: 52 spc: 7680 flg: 0x0012 seq: 0x0352 rec: 0x06
xid: 0x0009.028.00009c88
ktubl redo: slt: 40 rci: 0 opc: 5.7 objn: 0 objd: 0 tsn: 0
Undo type: Regular undo Begin trans Last buffer split: No
Temp Object: No
Tablespace Undo: No
0x00000000 prev ctl uba: 0x00800559.0352.05
prev ctl max cmt scn: 0x0000.0fa89905 prev tx cmt scn: 0x0000.0fa8990a
CHANGE #3 MEDIA RECOVERY MARKER SCN:0x0000.00000000 SEQ: 0 OP:5.20
session number = 8
serial number = 1
transaction name =

REDO RECORD - Thread:1 RBA: 0x000094.00000010.0010 LEN: 0x0054 VLD: 0x01
SCN: 0x0000.0fa89d03 SUBSCN: 1 04/14/2006 09:31:37
CHANGE #1 TYP:0 CLS:33 AFN:2 DBA:0x00800089 SCN:0x0000.0fa89d02 SEQ: 1 OP:5.4
ktucm redo: slt: 0x0028 sqn: 0x00009c88 srt: 0 sta: 9 flg: 0x2
ktucf redo: uba: 0x00800559.0352.06 ext: 2 spc: 7626 fbi: 0
END OF REDO DUMP
----- Redo read statistics for thread 1 -----
Read rate (ASYNC): 7Kb in 0.19s => 0.00 Mb/sec
Longest record: 0Kb, moves: 0/27 (0%)
Change moves: 6/63 (9%), moved: 0Mb

5.禁用日志生成,并切换日志

SQL> alter system set "_disable_logging"=true;

System altered.

SQL> alter system switch logfile;

System altered.

SQL> select * from v$log;

GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ---------
1 1 148 104857600 1 NO ACTIVE 262708457 14-APR-06
2 1 149 104857600 1 NO CURRENT 262708606 14-APR-06
3 1 147 104857600 1 NO INACTIVE 262675537 14-APR-06

6.SCOTT用户再更新

SQL> show parameter disable

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
_disable_logging boolean TRUE
SQL> update emp set sal=4000 where empno=7788;

1 row updated.

SQL> commit;

Commit complete.

 

7.转储日志

SQL> ALTER SYSTEM DUMP LOGFILE '/opt/oracle9/oradata/testora9/redo02.log';

System altered.

8.记录此时REDO信息

DUMP OF REDO FROM FILE '/opt/oracle9/oradata/testora9/redo02.log'
Opcodes *.*
DBA's: (file # 0, block # 0) thru (file # 65534, block # 4194303)
RBA's: 0x000000.00000000.0000 thru 0xffffffff.ffffffff.ffff
SCN's scn: 0x0000.00000000 thru scn: 0xffff.ffffffff
Times: creation thru eternity
FILE HEADER:
Software vsn=153092096=0x9200000, Compatibility Vsn=153092096=0x9200000
Db ID=1628068176=0x610a5950, Db Name='TESTORA9'
Activation ID=1628067152=0x610a5550
Control Seq=1163=0x48b, File size=204800=0x32000
File Number=2, Blksiz=512, File Type=2 LOG
descrip:"Thread 0001, Seq# 0000000149, SCN 0x00000fa89d7e-0xffffffffffff"
thread: 1 nab: 0xffffffff seq: 0x00000095 hws: 0x1 eot: 1 dis: 0
reset logs count: 0x1f435110 scn: 0x0000.00000001
Low scn: 0x0000.0fa89d7e 04/14/2006 09:33:43
Next scn: 0xffff.ffffffff 01/01/1988 00:00:00
Enabled scn: 0x0000.00000001 04/26/2004 15:56:10
Thread closed scn: 0x0000.0fa89d7e 04/14/2006 09:33:43
Log format vsn: 0x8000000 Disk cksum: 0xcac7 Calc cksum: 0xcac7
Terminal Recovery Stamp scn: 0x0000.00000000 01/01/1988 00:00:00
Most recent redo scn: 0x0000.00000000
Largest LWN: 0 blocks
End-of-redo stream : No
Unprotected mode
Miscellaneous flags: 0x0
END OF REDO DUMP


我们看到此时已经没有REDO生成.数据库仅记录少量必要信息而已.

这就是日志禁用的本质所在.

 


历史上的今天...
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无觅

By eygle on 2006-04-14 21:04 | Comments (0) | Internal | 744 |


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