1.转储针对特定数据块（4号文件的第10-20号数据块）修改的 redo entry
select file#,name,blocks from v$datafile; FILE# NAME BLOCKS ---------- -------------------------------------------------- ---------- 1 +DATA/test/datafile/system.269.829746597 89600 2 +DATA/test/datafile/sysaux.270.829746621 76800 3 +DATA/test/datafile/undotbs1.271.829746639 25600 4 +DATA/test/datafile/users.273.829746667 640 -转储 test 表第4行所在的数据块的修改记录 SQL> select t.rowid,t.* from scott.test t; ROWID DEPTNO DNAME LOC ------------------ ---------- -------------- ------------- AAAPtpAAEAAAADbAAA 10 ACCOUNTING NEW YORK AAAPtpAAEAAAADbAAB 20 RESEARCH DALLAS AAAPtpAAEAAAADbAAC 30 SALES CHICAGO AAAPtpAAEAAAADbAAD 40 OPERATIONS BOSTON SQL> select DBMS_ROWID.ROWID_OBJECT(rowid) as object#, 2 DBMS_ROWID.ROWID_RELATIVE_FNO(rowid) as file#, 3 dbms_rowid.rowid_block_number(rowid) as block#, 4 DBMS_ROWID.ROWID_ROW_NUMBER(rowid) as row# 5 from scott.test; OBJECT# FILE# BLOCK# ROW# ---------- ---------- ---------- ---------- 64361 4 219 0 64361 4 219 1 64361 4 219 2 64361 4 219 3 --当前属于 current 状态的 online redo log SQL> select * from v$log; GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME ---------- ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- --------- ------------ --------- 1 1 1 10485760 512 2 YES INACTIVE 430256 25-OCT-13 450682 28-OCT-13 2 1 2 10485760 512 2 YES INACTIVE 450682 28-OCT-13 453557 28-OCT-13 3 1 3 10485760 512 2 NO CURRENT 453557 28-OCT-13 2.8147E+14 --修改 scott.test 表中 deptno 为 40 的记录进行测试 SQL> select * from scott.dept; DEPTNO DNAME LOC ---------- -------------- ------------- 10 ACCOUNTING NEW YORK 20 RESEARCH DALLAS 30 SALES CHICAGO 40 OPERATIONS BOSTON SQL> update scott.test set LOC='BEIJING' where deptno=40; 1 row updated. SQL> commit; Commit complete. SQL> select * from scott.test; DEPTNO DNAME LOC ---------- -------------- ------------- 10 ACCOUNTING NEW YORK 20 RESEARCH DALLAS 30 SALES CHICAGO 40 OPERATIONS BEIJING --转储 redo entry，确保 redo log 没有切换 SQL> select * from v$log; GROUP# THREAD# SEQUENCE# BYTES BLOCKSIZE MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIM NEXT_CHANGE# NEXT_TIME ---------- ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- --------- ------------ --------- 1 1 1 10485760 512 2 YES INACTIVE 430256 25-OCT-13 450682 28-OCT-13 2 1 2 10485760 512 2 YES INACTIVE 450682 28-OCT-13 453557 28-OCT-13 3 1 3 10485760 512 2 NO CURRENT 453557 28-OCT-13 2.8147E+14 SQL> select * from v$logfile; GROUP# STATUS TYPE MEMBER IS_ ---------- ------- ------- -------------------------------------------------- --- 1 ONLINE +DATA/test/onlinelog/group_1.266.829746583 NO 1 ONLINE +FRA/test/onlinelog/group_1.261.829746585 YES 2 ONLINE +DATA/test/onlinelog/group_2.267.829746587 NO 2 ONLINE +FRA/test/onlinelog/group_2.262.829746589 YES 3 ONLINE +DATA/test/onlinelog/group_3.268.829746591 NO 3 ONLINE +FRA/test/onlinelog/group_3.263.829746593 YES 6 rows selected. SQL> alter system dump logfile '+FRA/test/onlinelog/group_3.263.829746593' dba min 4 219 dba max 4 219; System altered. --获取转储文件的路径 col value for a60 SQL> SQL> select * from v$diag_info; INST_ID NAME VALUE ---------- -------------------------------------------------- ------------------------------------------------------------ 1 Diag Enabled TRUE 1 ADR Base /u01/app/oracle 1 ADR Home /u01/app/oracle/diag/rdbms/test/test 1 Diag Trace /u01/app/oracle/diag/rdbms/test/test/trace 1 Diag Alert /u01/app/oracle/diag/rdbms/test/test/alert 1 Diag Incident /u01/app/oracle/diag/rdbms/test/test/incident 1 Diag Cdump /u01/app/oracle/diag/rdbms/test/test/cdump 1 Health Monitor /u01/app/oracle/diag/rdbms/test/test/hm 1 Default Trace File /u01/app/oracle/diag/rdbms/test/test/trace/test_ora_4160.trc 1 Active Problem Count 1 1 Active Incident Count 4 转储指定 SCN 的 redo entry SQL> select dbms_flashback.get_system_change_number from dual; GET_SYSTEM_CHANGE_NUMBER ------------------------ 455005 SQL> update scott.test set LOC='BOSTON' where deptno=40; 1 row updated. SQL> commit; Commit complete. SQL> select * from scott.test; DEPTNO DNAME LOC ---------- -------------- ------------- 10 ACCOUNTING NEW YORK 20 RESEARCH DALLAS 30 SALES CHICAGO 40 OPERATIONS BOSTON SQL> select dbms_flashback.get_system_change_number from dual; GET_SYSTEM_CHANGE_NUMBER ------------------------ 455020 alter system dump logfile '+FRA/test/onlinelog/group_3.263.829746593' scn min 455005 scn max 455020; SQL> select * from v$diag_info where NAME ='Default Trace File'; INST_ID NAME VALUE ---------- -------------------------------------------------- ------------------------------------------------------------ 1 Default Trace File /u01/app/oracle/diag/rdbms/test/test/trace/test_ora_4160.trc 转储指定 RBA 的 redo entry SQL> select group#,sequence#,BYTES/BLOCKSIZE as block# from v$log; GROUP# SEQUENCE# BLOCK# ---------- ---------- ---------- 1 1 20480 2 2 20480 3 3 20480alter system dump logfile '+FRA/test/onlinelog/group_3.263.829746593' rba min 3 1 rba max 3 10;
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作者：xiangsir
原文链接：http://blog.csdn.net/xiangsir/article/details/13503089
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MSN：xiangsir@hotmail.com