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本文链接地址:dataguard主库丢失archivelog，如何不重建备库？
昨天群中有网友问到dataguard环境中，由于主库archivelog丢失，且尚未同步到standby，问如何在避免
重建standby的情况下来将standby恢复成功的。 下面是我的测试过程，供参考！
―-主库
SQL>SELECT database_role FROM v$database; DATABASE_ROLE ----------------PRIMARY SQL> archive log list; DATABASE log mode Archive Mode Automatic archival Enabled Archive destination /arch Oldest online log SEQUENCE382NEXT log SEQUENCETO archive 383CURRENT log SEQUENCE383 SQL>SELECTCOUNT(1)FROM roger.test; COUNT(1)----------30 |
―-备库
SQL>SELECT database_role FROM v$database; DATABASE_ROLE ---------------- PHYSICAL STANDBY SQL> archive log list; DATABASE log mode Archive Mode Automatic archival Enabled Archive destination /arch2 Oldest online log SEQUENCE382NEXT log SEQUENCETO archive 0CURRENT log SEQUENCE383 SQL> SQL>ALTERDATABASE recover managed standby DATABASE cancel; DATABASE altered. SQL>ALTERDATABASEOPENREADONLY; DATABASE altered. SQL>SELECTCOUNT(1)FROM roger.test; COUNT(1)----------30 |
模拟主库丢失归档的情况：
―主库
SQL>SELECT*FROM v$Log; GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIME ---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ------------11383104857601 NO CURRENT74063810-OCT-1221382209715201 YES INACTIVE 74063310-OCT-12 SQL> archive log list; DATABASE log mode Archive Mode Automatic archival Enabled Archive destination /arch Oldest online log SEQUENCE382NEXT log SEQUENCETO archive 383CURRENT log SEQUENCE383 SQL>ALTER system SET log_archive_dest_state_2 ='defer'; System altered. SQL>DELETEFROM roger.test WHERE rownum <11; 10ROWS deleted. SQL> commit; Commit complete. SQL>SELECTCOUNT(*)FROM roger.test; COUNT(*)----------20 SQL>ALTER system switch logfile; System altered. SQL>/ System altered. SQL>/ System altered. SQL> ! [oracle@primarydb ~]$ cd /arch [oracle@primarydb arch]$ ls -ltr|tail -10-rw-r----- 1 oracle dba 3456000 Oct 10 15:18 1_374_726529113.dbf-rw-r----- 1 oracle dba 593408 Oct 10 15:23 1_375_726529113.dbf-rw-r----- 1 oracle dba 4608 Oct 10 15:23 1_376_726529113.dbf-rw-r----- 1 oracle dba 1024 Oct 10 15:23 1_377_726529113.dbf-rw-r----- 1 oracle dba 68096 Oct 10 15:25 1_378_726529113.dbf-rw-r----- 1 oracle dba 1297408 Oct 10 15:34 1_379_726529113.dbf-rw-r----- 1 oracle dba 2048 Oct 10 18:35 1_382_726529113.dbf-rw-r----- 1 oracle dba 166400 Oct 10 18:44 1_383_726529113.dbf-rw-r----- 1 oracle dba 2560 Oct 10 18:44 1_384_726529113.dbf-rw-r----- 1 oracle dba 1024 Oct 10 18:44 1_385_726529113.dbf[oracle@primarydb arch]$ rm 1_383_726529113.dbf ---删除archivelog[oracle@primarydb arch]$ rm 1_384_726529113.dbf [oracle@primarydb arch]$ exit exit SQL>ALTER system SET log_archive_dest_state_2 ='enable'; System altered. SQL> |
―备库
SQL>ALTERDATABASE recover managed standby DATABASE disconnect FROMSESSION; DATABASE altered. SQL> 此时alert log信息如下： Tue Nov 1314:45:262012 MRP0: Background Managed Standby Recovery process started (test) Managed Standby Recovery NOTUSINGREALTIME Apply parallel recovery started WITH2 processes Tue Nov 1314:45:312012 Waiting FORALL non-CURRENT ORLs TO be archived... Media Recovery Waiting FOR thread 1SEQUENCE383 Tue Nov 1314:45:322012 Completed: ALTERDATABASE recover managed standby DATABASE disconnect FROMSESSION Tue Nov 1314:45:592012 Redo Shipping Client Connected AS PUBLIC -- Connected User is Valid RFS[2]: Assigned TO RFS process 9542 RFS[2]: IDENTIFIEDDATABASETYPEAS'physical standby' RFS[2]: Archived Log: '/arch2/1_385_726529113.dbf' Tue Nov 1314:46:02 2012 Fetching gap SEQUENCEIN thread 1, gap SEQUENCE383-384 Tue Nov 1314:47:02 2012 FAL[client]: Failed TO request gap SEQUENCE GAP - thread 1SEQUENCE383-384 DBID 2024668720 branch 726529113 FAL[client]: ALL defined FAL servers have been attempted.-------------------------------------------------------------CHECK that the CONTROL_FILE_RECORD_KEEP_TIME initialization parameter IS defined TO a VALUE that IS sufficiently LARGE enough TO maintain adequate log switch information TO resolve archivelog gaps. |
如何在重建standby的情况下搞好备库呢？mos上,其实也有文章进行描述的,就是利用rman进行增量scn的恢复,下面我来进行展示：
1)首先定位到scn
SQL>SELECTSEQUENCE#,FIRST_CHANGE#,NEXT_CHANGE# FROM v$archived_log WHERESEQUENCE# >382ORDERBY1; SEQUENCE# FIRST_CHANGE# NEXT_CHANGE# ---------- ------------- ------------383740638740911384740911740915385740915740917385740915740917 |
2)根据scn，进行rman增量备份
[oracle@primarydb ~]$ cd $ORACLE_HOME/bin [oracle@primarydb bin]$ ./rman target / Recovery Manager: Release 10.2.0.4.0 - Production on Wed Oct 10 18:51:57 2012 Copyright (c) 1982, 2007, Oracle. All rights reserved. connected to target database: TEST (DBID=2024668720) RMAN> backup device type disk incremental from scn 740638 database format '/tmp/test_db_incre.bbk'; Starting backup at 10-OCT-12 using target database control file instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: sid=147 devtype=DISK channel ORA_DISK_1: starting full datafile backupset channel ORA_DISK_1: specifying datafile(s) in backupset input datafile fno=00004 name=/oracle/product/oradata/test/test01.dbf input datafile fno=00007 name=/oracle/product/oradata/test/sysaux01.dbf input datafile fno=00009 name=/oracle/product/oradata/test/test03.dbf input datafile fno=00006 name=/oracle/product/oradata/test/undo02.dbf input datafile fno=00001 name=/oracle/product/oradata/test/system01.dbf input datafile fno=00005 name=/oracle/product/oradata/test/perfstat.dbf input datafile fno=00003 name=/oracle/product/oradata/test/rman.dbf input datafile fno=00002 name=/oracle/product/oradata/test/undo01.dbf input datafile fno=00008 name=/oracle/product/oradata/test/test02.dbf input datafile fno=00010 name=/oracle/product/oradata/test/test04.dbf input datafile fno=00011 name=/oracle/product/oradata/test/test05.dbf channel ORA_DISK_1: starting piece 1 at 10-OCT-12 channel ORA_DISK_1: finished piece 1 at 10-OCT-12 piece handle=/tmp/test_db_incre.bbk tag=TAG20121010T185204 comment=NONE channel ORA_DISK_1: backup set complete, elapsed time: 00:03:26 Finished backup at 10-OCT-12 RMAN> |
3) 拷贝增量备份到standby
[oracle@primarydb bin]$ cd /tmp [oracle@primarydb tmp]$ scp test_db_incre.bbk 192.168.3.176:/tmp/backup The authenticity of host '192.168.3.176 (192.168.3.176)' can't be established. RSA key fingerprint is a4:54:6b:bf:12:34:42:73:f5:ba:5f:38:c7:28:9c:b5. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '192.168.3.176' (RSA) to the list of known hosts. [email protected]'s password: test_db_incre.bbk 100% 736KB 736.0KB/s 00:00 [oracle@primarydb tmp]$ |
4) standby进行recover
[oracle@standbydb bin]$ sqlplus "/as sysdba"SQL*Plus: Release 10.2.0.4.0 - Production ON Tue Nov 1315:03:462012 Copyright (c)1982,2007, Oracle.ALL Rights Reserved. Connected TO: Oracle DATABASE 10g Enterprise Edition Release 10.2.0.4.0 - Production WITH the Partitioning, OLAP,DATA Mining ANDREAL Application Testing options SQL>ALTERDATABASE recover managed standby DATABASE cancel; DATABASE altered. SQL> exit Disconnected FROM Oracle DATABASE 10g Enterprise Edition Release 10.2.0.4.0 - Production WITH the Partitioning, OLAP,DATA Mining ANDREAL Application Testing options [oracle@standbydb ~]$ cd $ORACLE_HOME/bin [oracle@standbydb bin]$ ./rman target / Recovery Manager: Release 10.2.0.4.0 - Production ON Tue Nov 1314:58:252012 Copyright (c)1982,2007, Oracle.ALL rights reserved. connected TO target DATABASE: TEST (DBID=2024668720,NOTOPEN) RMAN> catalog backuppiece '/tmp/backup/test_db_incre.bbk'; USING target DATABASE control file instead OF recovery catalog cataloged backuppiece backup piece handle=/tmp/backup/test_db_incre.bbk recid=49 stamp=799253957 RMAN> recover DATABASE noredo; Starting recover at 13-NOV-12USING target DATABASE control file instead OF recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: sid=97 devtype=DISK channel ORA_DISK_1: starting incremental datafile backupset restore channel ORA_DISK_1: specifying datafile(s)TO restore FROM backup SET destination FOR restore OF datafile 00001: /oracle/product/oradata/test/system01.dbf destination FOR restore OF datafile 00002: /oracle/product/oradata/test/undo01.dbf destination FOR restore OF datafile 00003: /oracle/product/oradata/test/rman.dbf destination FOR restore OF datafile 00004: /oracle/product/oradata/test/test01.dbf destination FOR restore OF datafile 00005: /oracle/product/oradata/test/perfstat.dbf destination FOR restore OF datafile 00006: /oracle/product/oradata/test/undo02.dbf destination FOR restore OF datafile 00007: /oracle/product/oradata/test/sysaux01.dbf destination FOR restore OF datafile 00008: /oracle/product/oradata/test/test02.dbf destination FOR restore OF datafile 00009: /oracle/product/oradata/test/test03.dbf destination FOR restore OF datafile 00010: /oracle/product/oradata/test/test04.dbf destination FOR restore OF datafile 00011: /oracle/product/oradata/test/test05.dbf channel ORA_DISK_1: reading FROM backup piece /tmp/backup/test_db_incre.bbk channel ORA_DISK_1: restored backup piece 1 piece handle=/tmp/backup/test_db_incre.bbk tag=TAG20121010T185204 channel ORA_DISK_1: restore complete, elapsed TIME: 00:00:01 Finished recover at 13-NOV-12 RMAN> 如下信息是recover时，alert log的记录信息： Tue Nov 1315:04:05 2012 Completed: ALTERDATABASE recover managed standby DATABASE cancel Tue Nov 1315:04:552012 Incremental restore complete OF datafile 2/oracle/product/oradata/test/undo01.dbf checkpoint IS741134 Incremental restore complete OF datafile 8/oracle/product/oradata/test/test02.dbf checkpoint IS741134 Incremental restore complete OF datafile 10/oracle/product/oradata/test/test04.dbf checkpoint IS741134 Incremental restore complete OF datafile 11/oracle/product/oradata/test/test05.dbf checkpoint IS741134 Incremental restore complete OF datafile 3/oracle/product/oradata/test/rman.dbf checkpoint IS741134 Incremental restore complete OF datafile 5/oracle/product/oradata/test/perfstat.dbf checkpoint IS741134 Incremental restore complete OF datafile 1/oracle/product/oradata/test/system01.dbf checkpoint IS741134 Incremental restore complete OF datafile 6/oracle/product/oradata/test/undo02.dbf checkpoint IS741134 Incremental restore complete OF datafile 4/oracle/product/oradata/test/test01.dbf checkpoint IS741134 Incremental restore complete OF datafile 7/oracle/product/oradata/test/sysaux01.dbf checkpoint IS741134 Incremental restore complete OF datafile 9/oracle/product/oradata/test/test03.dbf checkpoint IS741134 |
5) 开启standby同步，检查是否ok。
SQL>ALTERDATABASE recover managed standby DATABASE disconnect FROMSESSION; DATABASE altered. SQL>SELECT database_role,open_mode FROM v$database; DATABASE_ROLE OPEN_MODE ---------------- ---------- PHYSICAL STANDBY MOUNTED --主库切换日志 SQL>SELECT database_role,open_mode FROM v$database; DATABASE_ROLE OPEN_MODE ---------------- ----------PRIMARYREADWRITE SQL> SQL>ALTER system switch logfile; System altered. SQL>SELECTMAX(al.SEQUENCE#)"Last Seq Recieved",2MAX(lh.SEQUENCE#)"Last Seq Applied"3FROM v$archived_log al, v$log_history lh; LAST Seq Recieved LAST Seq Applied ----------------- ----------------386386 SQL>--备库 SQL>SELECTMAX(al.SEQUENCE#)"Last Seq Recieved",2MAX(lh.SEQUENCE#)"Last Seq Applied"3FROM v$archived_log al, v$log_history lh; LAST Seq Recieved LAST Seq Applied ----------------- ----------------386382 SQL> SQL>SELECT*FROM v$archive_gap; THREAD# LOW_SEQUENCE# HIGH_SEQUENCE# ---------- ------------- --------------1383384 备库archivelog： [oracle@standbydb arch2]$ ls -ltr |tail -5-rw-r----- 1 oracle dba 2048 Nov 13 14:33 1_381_726529113.dbf-rw-r----- 1 oracle dba 2048 Nov 13 14:34 1_382_726529113.dbf-rw-r----- 1 oracle dba 1024 Nov 13 14:45 1_385_726529113.dbf-rw-r----- 1 oracle dba 1262080 Nov 13 15:06 1_386_726529113.dbf 备库alert log此时的信息： Tue Nov 1315:06:172012ALTERDATABASE recover managed standby DATABASE disconnect FROMSESSION Tue Nov 1315:06:172012 Attempt TOSTART background Managed Standby Recovery process (test) MRP0 started WITH pid=19, OS id=13497 Tue Nov 1315:06:172012 MRP0: Background Managed Standby Recovery process started (test) Managed Standby Recovery NOTUSINGREALTIME Apply parallel recovery started WITH2 processes Tue Nov 1315:06:222012 Waiting FORALL non-CURRENT ORLs TO be archived... Media Recovery Waiting FOR thread 1SEQUENCE383 Fetching gap SEQUENCEIN thread 1, gap SEQUENCE383-384 Tue Nov 1315:06:232012 Completed: ALTERDATABASE recover managed standby DATABASE disconnect FROMSESSION Tue Nov 1315:06:542012 Redo Shipping Client Connected AS PUBLIC -- Connected User is Valid RFS[3]: Assigned TO RFS process 13596 RFS[3]: IDENTIFIEDDATABASETYPEAS'physical standby'PRIMARYDATABASEISIN MAXIMUM PERFORMANCE mode PRIMARYDATABASEISIN MAXIMUM PERFORMANCE mode RFS[3]: Successfully opened standby log 4: '/oracle/product/oradata/test/redo04.log' Tue Nov 1315:06:542012 RFS[2]: Successfully opened standby log 3: '/oracle/product/oradata/test/redo03.log' Tue Nov 1315:07:232012 FAL[client]: Failed TO request gap SEQUENCE GAP - thread 1SEQUENCE383-384 DBID 2024668720 branch 726529113 FAL[client]: ALL defined FAL servers have been attempted.-------------------------------------------------------------CHECK that the CONTROL_FILE_RECORD_KEEP_TIME initialization parameter IS defined TO a VALUE that IS sufficiently LARGE enough TO maintain adequate log switch information TO resolve archivelog gaps. |
我们可以看到，虽然备库，仍然在提示383,384是gap ，但是实际上已经是同步的了。
6)最后来验证下数据
SQL>ALTERDATABASE recover managed standby DATABASE cancel; DATABASE altered. SQL>SELECT file#,checkpoint_change# FROM v$datafile ORDERBY1; FILE# CHECKPOINT_CHANGE# ---------- ------------------174063827406383740638474063857406386740638774063887406389740638107406381174063811ROWS selected. SQL>SELECT file#,checkpoint_change# FROM v$datafile_header ORDERBY1; FILE# CHECKPOINT_CHANGE# ---------- ------------------174113427411343741134474113457411346741134774113487411349741134107411341174113411ROWS selected. SQL>ALTERDATABASEOPENREADONLY; ALTERDATABASEOPENREADONLY* ERROR at line 1: ORA-16004: backup DATABASE requires recovery ORA-01152: file 1 was NOT restored FROM a sufficiently OLD backup ORA-01110: DATA file 1: '/oracle/product/oradata/test/system01.dbf' 重建备库的standby controlfile： SQL>ALTERDATABASECREATE standby controlfile AS'/tmp/standby.ctl'; DATABASE altered. SQL> exit Disconnected FROM Oracle DATABASE 10g Enterprise Edition Release 10.2.0.4.0 - Production WITH the Partitioning, OLAP,DATA Mining ANDREAL Application Testing options [oracle@primarydb tmp]$ scp standby.ctl 192.168.3.176:/tmp/backup oracle@192.168.3.176's password: standby.ctl 100% 3928KB 3.8MB/s 00:00 [oracle@primarydb tmp]$ [oracle@standbydb bin]$ ./rman target / Recovery Manager: Release 10.2.0.4.0 - Production on Tue Nov 13 15:19:09 2012 Copyright (c) 1982, 2007, Oracle. All rights reserved. connected to target database (not started) RMAN> startup nomount Oracle instance started Total System Global Area 264241152 bytes Fixed Size 1266944 bytesVariable Size 209718016 bytesDatabase Buffers 50331648 bytesRedo Buffers 2924544 bytes RMAN> restore controlfile from '/tmp/backup/standby.ctl'; Starting restore at 13-NOV-12using target database control file instead of recovery catalogallocated channel: ORA_DISK_1channel ORA_DISK_1: sid=101 devtype=DISK channel ORA_DISK_1: copied control file copyoutput filename=/oracle/product/oradata/test/control01.ctlFinished restore at 13-NOV-12 RMAN> startup mount database is already starteddatabase mountedreleased channel: ORA_DISK_1 RMAN> exit Recovery Manager complete.[oracle@standbydb bin]$ sqlplus "/as sysdba" SQL*Plus: Release 10.2.0.4.0 - Production on Tue Nov 13 15:20:02 2012 Copyright (c) 1982, 2007, Oracle. All Rights Reserved. Connected to:Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - ProductionWith the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> alter database recover managed standby database disconnect from session; Database altered. SQL> alter database recover managed standby database cancel; Database altered. SQL> SQL> SQL> alter database open read only; Database altered. SQL> select count(1) from roger.test; COUNT(1)---------- 20 |