一. dump redo 说明
关于Dump redo log 的示例,MOS 上的文档:[ID 1031381.6] 有详细说明。Dump 有两种方式: (1)使用"alter session" 命令dumpredo header。 (2)使用"alter system dump logfile" 命令dump logfile contents。 可以在mount,nomout和open状态下使用如上命令,并且使用以上命令需要"alter system" 的权限。 可以使用该命令dump onlie redo log 或者归档文件。 当操作系统系统相同的情况下,还可以dump其他db的log 文件。 有如下dump 方法: 1.To dump records based in DBA (Data Block Address) 2.To dump records based on RBA (Redo Block Address) 3.To dump records based on SCN 4.To dump records based on time 5.To dump records based on layer and opcode 6.Dump the file header information 7.Dump an entire log file:
二. 具体使用示例
2.1 To dump records based on DBA (Data Block Address)
关于DBA的说明,参考:
Oracle rdba和 dba 说明 http://www.linuxidc.com/Linux/2011-07/37999.htm 根据DBA进行dump,主要是根据file和block 号来进行dump。 这个的block 是一个范围值。 11g命令格式如下:ALTER SYSTEM DUMP LOGFILE "filename" DBA MIN fileno . blockno DBA MAX fileno . blockno; 如果是Oracle 10g,需要省略".",即格式如下:ALTER SYSTEM DUMP LOGFILE "filename" DBA MIN fileno blockno DBA MAX fileno blockno; 否则会报: ORA-01963: Must specify a block number 错误。 如:SYS@anqing1(rac1)> select * fromv$version where rownum=1; BANNER----------------------------------------------------------------Oracle Database 10g Enterprise EditionRelease 10.2.0.4.0 - Prod SQL>select distinct dbms_rowid.rowid_relative_fno(rowid) rel_fno,dbms_rowid.rowid_block_number(rowid)blockno from ta; REL_FNO BLOCKNO---------- ---------- 1 294608 1 294609 1 294612 1 294614 1 294621 1 294635 1 294643 1 294654 1 294656 1 294657 6 10385 REL_FNO BLOCKNO---------- ---------- 6 10393 6 10410 6 10411 6 10415 6 10416 6 10458 6 10461 6 10464 6 10465 6 10468 6 10472 确定log file 位置:SYS@anqing1(rac1)> selecta.group#,a.status,b.member from v$log a,v$logfile b where a.group#=b.group#; GROUP# STATUS MEMBER---------- -------------------------------------------------------------------- 3 INACTIVE +DATA/anqing/onlinelog/redo03.log 2 INACTIVE +DATA/anqing/onlinelog/redo02.log 1 CURRENT +DATA/anqing/onlinelog/group_1.277.751552735 1 CURRENT +FRA/anqing/onlinelog/group_1.426.751552739 4 CURRENT +DATA/anqing/onlinelog/group_4.282.751560131 5 INACTIVE +DATA/anqing/onlinelog/group_5.283.751560139 6 rows selected. SYS@anqing1(rac1)> alter system dump logfile"+data/anqing/onlinelog/redo02.log" dbamin 6 10458 dba max 6 10472; System altered. SYS@anqing1(rac1)> oradebug setmypidStatement processed.SYS@anqing1(rac1)> oradebug tracefile_name/u01/app/oracle/admin/anqing/udump/anqing1_ora_30373.trcSYS@anqing1(rac1)> [oracle@rac1 ~]$cat /u01/app/oracle/admin/anqing/udump/anqing1_ora_30373.trc/u01/app/oracle/admin/anqing/udump/anqing1_ora_30373.trcOracle Database 10g Enterprise EditionRelease 10.2.0.4.0 - ProductionWith the Partitioning, Real ApplicationClusters, OLAP, Data Miningand Real Application Testing optionsORACLE_HOME =/u01/app/oracle/product/10.2.0/db_1System name: LinuxNode name: rac1Release: 2.6.18-194.el5Version: #1 SMP Tue Mar 16 21:52:43 EDT 2010Machine: i686Instance name: anqing1Redo thread mounted by this instance: 1Oracle process number: 28Unix process pid: 30373, image: oracle@rac1(TNS V1-V3) *** 2011-08-08 22:10:37.053*** ACTION NAME:() 2011-08-08 22:10:37.052*** MODULE NAME:(sqlplus@rac1 (TNS V1-V3))2011-08-08 22:10:37.052*** SERVICE NAME:(SYS$USERS) 2011-08-0822:10:37.052*** SESSION ID:(127.27077) 2011-08-0822:10:37.052 DUMP OF REDO FROM FILE"+data/anqing/onlinelog/redo02.log" Opcodes *.* DBAs: (file # 6, block # 10458) thru (file #6, block # 10472) RBAs: 0x000000.00000000.0000 thru0xffffffff.ffffffff.ffff SCNs: scn: 0x0000.00000000 thru scn:0xffff.ffffffff Times: creation thru eternity FILEHEADER: Compatibility Vsn = 169870336=0xa200400 Db ID=715014091=0x2a9e3fcb, Db Name="ANQING" Activation ID=682502900=0x28ae2af4 Control Seq=4261=0x10a5, File size=102400=0x19000 File Number=2, Blksiz=512, File Type=2 LOG descrip:"Thread0001, Seq# 0000000119, SCN 0x0000006ab1bc-0x0000006e0c84" thread: 1 nab: 0x18ffd seq: 0x00000077 hws:0x2 eot: 0 dis: 0 resetlogs count: 0x2ccbc8df scn:0x0000.000704fa (460026) resetlogs terminal rcv count: 0x0 scn:0x0000.00000000 prevresetlogs count: 0x2ebbfe8f scn: 0x0000.0006ce7b (446075) prevresetlogs terminal rcv count: 0x0 scn: 0x0000.00000000 Low scn: 0x0000.006ab1bc (6992316) 07/30/2011 05:39:17 Nextscn: 0x0000.006e0c84 (7212164) 08/03/2011 14:14:34 Enabled scn: 0x0000.000704fa (460026)05/19/2011 12:38:55 Thread closed scn: 0x0000.006ab1bc (6992316)07/30/2011 05:39:17 Diskcksum: 0xd530 Calc cksum: 0xd530 Terminal recovery stop scn: 0x0000.00000000 Terminal recovery 01/01/1988 00:00:00 Mostrecent redo scn: 0x0000.00000000 Largest LWN: 1874 blocks End-of-redo stream : No Unprotected mode Miscellaneous flags: 0x0 Thread internal enable indicator: thr: 0, seq:0 scn: 0x0000.00000000 REDO RECORD - Thread:1 RBA:0x000077.00000cd6.017c LEN: 0x0048 VLD: 0x01SCN: 0x0000.006ac8a9 SUBSCN: 1 07/30/2011 08:28:08CHANGE #1 MEDIA RECOVERY MARKERSCN:0x0000.00000000 SEQ: 0 OP:18.3Reuse redo entryRange reuse: tsn=1 base=8542185 nblks=8 REDO RECORD - Thread:1 RBA:0x000077.00006e99.0078 LEN: 0x0044 VLD: 0x01SCN: 0x0000.006b7ae1 SUBSCN: 1 07/31/2011 06:18:10CHANGE #1 MEDIA RECOVERY MARKERSCN:0x0000.00000000 SEQ: 0 OP:17.4Datafile resize marker - file: 2 old size:153600 new size: 156160 REDO RECORD - Thread:1 RBA:0x000077.00007884.017c LEN: 0x0048 VLD: 0x01SCN: 0x0000.006b8d16 SUBSCN: 1 07/31/2011 08:33:09CHANGE #1 MEDIA RECOVERY MARKERSCN:0x0000.00000000 SEQ: 0 OP:18.3Reuse redo entryRange reuse: tsn=1 base=8542217 nblks=1024*** 2011-08-08 22:10:54.783END OF REDO DUMP----- Redo read statistics for thread 1-----Read rate (ASYNC): 51197Kb in 17.78s =>2.81 Mb/secTotal physical reads: 51197KbLongest record: 8Kb, moves: 0/85186 (0%)Change moves: 30223/143291 (21%), moved:5MbLongest LWN: 937Kb, moves: 6/66426 (0%),moved: 0MbLast redo scn: 0x0000.006e087b (7211131)----------------------------------------------[oracle@rac1 ~]$
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