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DBA Scripts:转换RDBA的文件和数据块地址
作者：eygle |【转载时请务必以超链接形式标明文章原始出处和作者信息及本声明】链接：http://www.eygle.com/archives/2007/07/function_rdba_convert.html
昨天作测试，涉及很多rdba的转换，一般我是自己手工转换的，不过考虑到自己的书中有地方涉及这些转换，手工显然不容易解释的。
RDBA的关系参考如下链接:
http://www.eygle.com/archives/2004/08/how_to_dump_datablock.html
写了一个简单的函数，用来从RDBA中转换file#和block#出来:
CREATE OR REPLACE FUNCTION getbfno (p_dba IN VARCHAR2)
RETURN VARCHAR2
IS
l_str VARCHAR2 (255) DEFAULT NULL;
l_fno VARCHAR2 (15);
l_bno VARCHAR2 (15);
BEGIN
l_fno :=
DBMS_UTILITY.data_block_address_file (TO_NUMBER (LTRIM (p_dba, '0x'),
'xxxxxxxx'
)
);
l_bno :=
DBMS_UTILITY.data_block_address_block (TO_NUMBER (LTRIM (p_dba, '0x'),
'xxxxxxxx'
)
);
l_str :=
'datafile# is:'
|| l_fno
|| CHR (10)
|| 'datablock is:'
|| l_bno
|| CHR (10)
|| 'dump command:alter system dump datafile '
|| l_fno
|| ' block '
|| l_bno
|| ';';
RETURN l_str;
END;
/
有了这个函数，方便了很多:
SQL> col BFNO for a60
SQL> select getbfno('0x037d86de') BFNO from dual;BFNO
------------------------------------------------------------
datafile# is:13
datablock is:4032222
dump command:alter system dump datafile 13 block 4032222;
-The End-
By eygle on 2007-07-05 21:00 | Comments (5) | Posted to Scripts | Edit |Pageviews:
留言 (5)
写得太复杂了吧.
ASQL> select to_number('037d86de','xxxxxxxx') from dual;
TO_NUMBER('037D86DE','XXXXXXXX')
--------------------------------
58558174
1 rows returned.
ASQL> SELECT BITAND(58558174,4194303) from dual;
BITAND(58558174,4194303)
------------------------
4032222
1 rows returned.
ASQL> SELECT trunc(58558174/4194303) from dual;
TRUNC(58558174/4194303)
-----------------------
13
1 rows returned.
Posted by: anysql at July 6, 2007 6:51 AM
你还要注意,file#大于1023以后的情况呢,rfile#是重新开始循环的.没有这么简单转换的.
Posted by: piner at July 6, 2007 8:41 AM
那种情况下, 肯定是要查数据字典的进行从rfile#到file#的转换的, 没有规律可言啊.
Posted by: anysql at July 6, 2007 9:18 AM
这个大Bug很难避免的，光靠Rdba的信息是不足够的。
不过通常的测试，这个还是够用了。
Posted by: eygle at July 6, 2007 10:09 AM
dbca起的够早的啊
Posted by: victor666666 at July 6, 2007 11:14 AM
