本文主要描述Oracle备库日志与主库日志之间有gap，切主库这部分gap的归档日志已经删除或丢失，如何在不重建备库的情况下，恢复备库。
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作者：张正
blog：http://space.itpub.net/26355921
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在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$database;
DATABASE_ROLE
----------------
PRIMARY
SQL> archive log list;
DATABASE log mode Archive Mode
Automatic archival Enabled
Archive destination /arch
Oldest online log SEQUENCE 382
NEXT log SEQUENCE TO archive 383
CURRENT log SEQUENCE 383
SQL> SELECT COUNT(1) FROM roger.test;
COUNT(1)
----------
30
—-备库
SQL> SELECT database_role FROM v$database;
DATABASE_ROLE
----------------
PHYSICAL STANDBY
SQL> archive log list;
DATABASE log mode Archive Mode
Automatic archival Enabled
Archive destination /arch2
Oldest online log SEQUENCE 382
NEXT log SEQUENCE TO archive 0
CURRENT log SEQUENCE 383
SQL>
SQL> ALTER DATABASE recover managed standby DATABASE cancel;
DATABASE altered.
SQL> ALTER DATABASE OPEN READ ONLY;
DATABASE altered.
SQL> SELECT COUNT(1) FROM roger.test;
COUNT(1)
----------
30
模拟主库丢失归档的情况：
—主库
SQL> SELECT * FROM v$Log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIME
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ------------
1 1 383 10485760 1 NO CURRENT 740638 10-OCT-12
2 1 382 20971520 1 YES INACTIVE 740633 10-OCT-12
SQL> archive log list;
DATABASE log mode Archive Mode
Automatic archival Enabled
Archive destination /arch
Oldest online log SEQUENCE 382
NEXT log SEQUENCE TO archive 383
CURRENT log SEQUENCE 383
SQL> ALTER system SET log_archive_dest_state_2 = 'defer';
System altered.
SQL> DELETE FROM roger.test WHERE rownum < 11;
10 ROWS deleted.
SQL> commit;
Commit complete.
SQL> SELECT COUNT(*) FROM roger.test;
COUNT(*)
----------
20
SQL> ALTER system switch logfile;
System altered.
SQL> /
System altered.
SQL> /
System altered.
SQL> !
[oracle@primarydb ~]$ 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> ALTER DATABASE recover managed standby DATABASE disconnect FROM SESSION;
DATABASE altered.
SQL>
此时alert log信息如下：
Tue Nov 13 14:45:26 2012
MRP0: Background Managed Standby Recovery process started (test)
Managed Standby Recovery NOT USING REAL TIME Apply
parallel recovery started WITH 2 processes
Tue Nov 13 14:45:31 2012
Waiting FOR ALL non-CURRENT ORLs TO be archived...
Media Recovery Waiting FOR thread 1 SEQUENCE 383
Tue Nov 13 14:45:32 2012
Completed: ALTER DATABASE recover managed standby DATABASE disconnect FROM SESSION
Tue Nov 13 14:45:59 2012
Redo Shipping Client Connected AS PUBLIC
-- Connected User is Valid
RFS[2]: Assigned TO RFS process 9542
RFS[2]: IDENTIFIED DATABASE TYPE AS 'physical standby'
RFS[2]: Archived Log: '/arch2/1_385_726529113.dbf'
Tue Nov 13 14:46:02 2012
Fetching gap SEQUENCE IN thread 1, gap SEQUENCE 383-384
Tue Nov 13 14:47:02 2012
FAL[client]: Failed TO request gap SEQUENCE
GAP - thread 1 SEQUENCE 383-384
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> SELECT SEQUENCE#,FIRST_CHANGE#,NEXT_CHANGE# FROM v$archived_log WHERE SEQUENCE# > 382 ORDER BY 1;
SEQUENCE# FIRST_CHANGE# NEXT_CHANGE#
---------- ------------- ------------
383 740638 740911
384 740911 740915
385 740915 740917
385 740915 740917
2)根据scn，进行rman增量备份
[oracle@primarydb ~]$ 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. oracle@192.168.3.176'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 13 15:03:46 2012 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 AND REAL Application Testing options SQL> ALTER DATABASE 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 AND REAL 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 13 14:58:25 2012 Copyright (c) 1982, 2007, Oracle. ALL rights reserved. connected TO target DATABASE: TEST (DBID=2024668720, NOT OPEN) 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-12 USING 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 13 15:04:05 2012 Completed: ALTER DATABASE recover managed standby DATABASE cancel Tue Nov 13 15:04:55 2012 Incremental restore complete OF datafile 2 /oracle/product/oradata/test/undo01.dbf checkpoint IS 741134 Incremental restore complete OF datafile 8 /oracle/product/oradata/test/test02.dbf checkpoint IS 741134 Incremental restore complete OF datafile 10 /oracle/product/oradata/test/test04.dbf checkpoint IS 741134 Incremental restore complete OF datafile 11 /oracle/product/oradata/test/test05.dbf checkpoint IS 741134 Incremental restore complete OF datafile 3 /oracle/product/oradata/test/rman.dbf checkpoint IS 741134 Incremental restore complete OF datafile 5 /oracle/product/oradata/test/perfstat.dbf checkpoint IS 741134 Incremental restore complete OF datafile 1 /oracle/product/oradata/test/system01.dbf checkpoint IS 741134 Incremental restore complete OF datafile 6 /oracle/product/oradata/test/undo02.dbf checkpoint IS 741134 Incremental restore complete OF datafile 4 /oracle/product/oradata/test/test01.dbf checkpoint IS 741134 Incremental restore complete OF datafile 7 /oracle/product/oradata/test/sysaux01.dbf checkpoint IS 741134 Incremental restore complete OF datafile 9 /oracle/product/oradata/test/test03.dbf checkpoint IS 741134 5) 开启standby同步，检查是否ok。 SQL> ALTER DATABASE recover managed standby DATABASE disconnect FROM SESSION; 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 ---------------- ---------- PRIMARY READ WRITE SQL> SQL> ALTER system switch logfile; System altered. SQL> SELECT MAX(al.SEQUENCE#) "Last Seq Recieved", 2 MAX(lh.SEQUENCE#) "Last Seq Applied" 3 FROM v$archived_log al, v$log_history lh; LAST Seq Recieved LAST Seq Applied ----------------- ---------------- 386 386 SQL> --备库 SQL> SELECT MAX(al.SEQUENCE#) "Last Seq Recieved", 2 MAX(lh.SEQUENCE#) "Last Seq Applied" 3 FROM v$archived_log al, v$log_history lh; LAST Seq Recieved LAST Seq Applied ----------------- ---------------- 386 382 SQL> SQL> SELECT * FROM v$archive_gap; THREAD# LOW_SEQUENCE# HIGH_SEQUENCE# ---------- ------------- -------------- 1 383 384 备库archivelog： [oracle@standbydb arch2]$ 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 13 15:06:17 2012 ALTER DATABASE recover managed standby DATABASE disconnect FROM SESSION Tue Nov 13 15:06:17 2012 Attempt TO START background Managed Standby Recovery process (test) MRP0 started WITH pid=19, OS id=13497 Tue Nov 13 15:06:17 2012 MRP0: Background Managed Standby Recovery process started (test) Managed Standby Recovery NOT USING REAL TIME Apply parallel recovery started WITH 2 processes Tue Nov 13 15:06:22 2012 Waiting FOR ALL non-CURRENT ORLs TO be archived... Media Recovery Waiting FOR thread 1 SEQUENCE 383 Fetching gap SEQUENCE IN thread 1, gap SEQUENCE 383-384 Tue Nov 13 15:06:23 2012 Completed: ALTER DATABASE recover managed standby DATABASE disconnect FROM SESSION Tue Nov 13 15:06:54 2012 Redo Shipping Client Connected AS PUBLIC -- Connected User is Valid RFS[3]: Assigned TO RFS process 13596 RFS[3]: IDENTIFIED DATABASE TYPE AS 'physical standby' PRIMARY DATABASE IS IN MAXIMUM PERFORMANCE mode PRIMARY DATABASE IS IN MAXIMUM PERFORMANCE mode RFS[3]: Successfully opened standby log 4: '/oracle/product/oradata/test/redo04.log' Tue Nov 13 15:06:54 2012 RFS[2]: Successfully opened standby log 3: '/oracle/product/oradata/test/redo03.log' Tue Nov 13 15:07:23 2012 FAL[client]: Failed TO request gap SEQUENCE GAP - thread 1 SEQUENCE 383-384 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> ALTER DATABASE recover managed standby DATABASE cancel; DATABASE altered. SQL> SELECT file#,checkpoint_change# FROM v$datafile ORDER BY 1; FILE# CHECKPOINT_CHANGE# ---------- ------------------ 1 740638 2 740638 3 740638 4 740638 5 740638 6 740638 7 740638 8 740638 9 740638 10 740638 11 740638 11 ROWS selected. SQL> SELECT file#,checkpoint_change# FROM v$datafile_header ORDER BY 1; FILE# CHECKPOINT_CHANGE# ---------- ------------------ 1 741134 2 741134 3 741134 4 741134 5 741134 6 741134 7 741134 8 741134 9 741134 10 741134 11 741134 11 ROWS selected. SQL> ALTER DATABASE OPEN READ ONLY; ALTER DATABASE OPEN READ ONLY * 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> ALTER DATABASE CREATE 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 AND REAL 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 bytes Variable Size 209718016 bytes Database Buffers 50331648 bytes Redo Buffers 2924544 bytes RMAN> restore controlfile from '/tmp/backup/standby.ctl'; Starting restore at 13-NOV-12 using target database control file instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: sid=101 devtype=DISK channel ORA_DISK_1: copied control file copy output filename=/oracle/product/oradata/test/control01.ctl Finished restore at 13-NOV-12 RMAN> startup mount database is already started database mounted released 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 - Production With 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 SQL> 最后，我们可以看到，在主库archivelog丢失无法同步到备库时，可以利用增量scn的方式，来避免重建standby。
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$database;
DATABASE_ROLE
----------------
PRIMARY
SQL> archive log list;
DATABASE log mode Archive Mode
Automatic archival Enabled
Archive destination /arch
Oldest online log SEQUENCE 382
NEXT log SEQUENCE TO archive 383
CURRENT log SEQUENCE 383
SQL> SELECT COUNT(1) FROM roger.test;
COUNT(1)
----------
30
—-备库
SQL> SELECT database_role FROM v$database;
DATABASE_ROLE
----------------
PHYSICAL STANDBY
SQL> archive log list;
DATABASE log mode Archive Mode
Automatic archival Enabled
Archive destination /arch2
Oldest online log SEQUENCE 382
NEXT log SEQUENCE TO archive 0
CURRENT log SEQUENCE 383
SQL>
SQL> ALTER DATABASE recover managed standby DATABASE cancel;
DATABASE altered.
SQL> ALTER DATABASE OPEN READ ONLY;
DATABASE altered.
SQL> SELECT COUNT(1) FROM roger.test;
COUNT(1)
----------
30
模拟主库丢失归档的情况：
—主库
SQL> SELECT * FROM v$Log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARC STATUS FIRST_CHANGE# FIRST_TIME
---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- ------------
1 1 383 10485760 1 NO CURRENT 740638 10-OCT-12
2 1 382 20971520 1 YES INACTIVE 740633 10-OCT-12
SQL> archive log list;
DATABASE log mode Archive Mode
Automatic archival Enabled
Archive destination /arch
Oldest online log SEQUENCE 382
NEXT log SEQUENCE TO archive 383
CURRENT log SEQUENCE 383
SQL> ALTER system SET log_archive_dest_state_2 = 'defer';
System altered.
SQL> DELETE FROM roger.test WHERE rownum < 11;
10 ROWS deleted.
SQL> commit;
Commit complete.
SQL> SELECT COUNT(*) FROM roger.test;
COUNT(*)
----------
20
SQL> ALTER system switch logfile;
System altered.
SQL> /
System altered.
SQL> /
System altered.
SQL> !
[oracle@primarydb ~]$ 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> ALTER DATABASE recover managed standby DATABASE disconnect FROM SESSION;
DATABASE altered.
SQL>
此时alert log信息如下：
Tue Nov 13 14:45:26 2012
MRP0: Background Managed Standby Recovery process started (test)
Managed Standby Recovery NOT USING REAL TIME Apply
parallel recovery started WITH 2 processes
Tue Nov 13 14:45:31 2012
Waiting FOR ALL non-CURRENT ORLs TO be archived...
Media Recovery Waiting FOR thread 1 SEQUENCE 383
Tue Nov 13 14:45:32 2012
Completed: ALTER DATABASE recover managed standby DATABASE disconnect FROM SESSION
Tue Nov 13 14:45:59 2012
Redo Shipping Client Connected AS PUBLIC
-- Connected User is Valid
RFS[2]: Assigned TO RFS process 9542
RFS[2]: IDENTIFIED DATABASE TYPE AS 'physical standby'
RFS[2]: Archived Log: '/arch2/1_385_726529113.dbf'
Tue Nov 13 14:46:02 2012
Fetching gap SEQUENCE IN thread 1, gap SEQUENCE 383-384
Tue Nov 13 14:47:02 2012
FAL[client]: Failed TO request gap SEQUENCE
GAP - thread 1 SEQUENCE 383-384
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> SELECT SEQUENCE#,FIRST_CHANGE#,NEXT_CHANGE# FROM v$archived_log WHERE SEQUENCE# > 382 ORDER BY 1;
SEQUENCE# FIRST_CHANGE# NEXT_CHANGE#
---------- ------------- ------------
383 740638 740911
384 740911 740915
385 740915 740917
385 740915 740917
2)根据scn，进行rman增量备份
[oracle@primarydb ~]$ 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. oracle@192.168.3.176'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 13 15:03:46 2012 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 AND REAL Application Testing options SQL> ALTER DATABASE 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 AND REAL 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 13 14:58:25 2012 Copyright (c) 1982, 2007, Oracle. ALL rights reserved. connected TO target DATABASE: TEST (DBID=2024668720, NOT OPEN) 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-12 USING 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 13 15:04:05 2012 Completed: ALTER DATABASE recover managed standby DATABASE cancel Tue Nov 13 15:04:55 2012 Incremental restore complete OF datafile 2 /oracle/product/oradata/test/undo01.dbf checkpoint IS 741134 Incremental restore complete OF datafile 8 /oracle/product/oradata/test/test02.dbf checkpoint IS 741134 Incremental restore complete OF datafile 10 /oracle/product/oradata/test/test04.dbf checkpoint IS 741134 Incremental restore complete OF datafile 11 /oracle/product/oradata/test/test05.dbf checkpoint IS 741134 Incremental restore complete OF datafile 3 /oracle/product/oradata/test/rman.dbf checkpoint IS 741134 Incremental restore complete OF datafile 5 /oracle/product/oradata/test/perfstat.dbf checkpoint IS 741134 Incremental restore complete OF datafile 1 /oracle/product/oradata/test/system01.dbf checkpoint IS 741134 Incremental restore complete OF datafile 6 /oracle/product/oradata/test/undo02.dbf checkpoint IS 741134 Incremental restore complete OF datafile 4 /oracle/product/oradata/test/test01.dbf checkpoint IS 741134 Incremental restore complete OF datafile 7 /oracle/product/oradata/test/sysaux01.dbf checkpoint IS 741134 Incremental restore complete OF datafile 9 /oracle/product/oradata/test/test03.dbf checkpoint IS 741134 5) 开启standby同步，检查是否ok。 SQL> ALTER DATABASE recover managed standby DATABASE disconnect FROM SESSION; 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 ---------------- ---------- PRIMARY READ WRITE SQL> SQL> ALTER system switch logfile; System altered. SQL> SELECT MAX(al.SEQUENCE#) "Last Seq Recieved", 2 MAX(lh.SEQUENCE#) "Last Seq Applied" 3 FROM v$archived_log al, v$log_history lh; LAST Seq Recieved LAST Seq Applied ----------------- ---------------- 386 386 SQL> --备库 SQL> SELECT MAX(al.SEQUENCE#) "Last Seq Recieved", 2 MAX(lh.SEQUENCE#) "Last Seq Applied" 3 FROM v$archived_log al, v$log_history lh; LAST Seq Recieved LAST Seq Applied ----------------- ---------------- 386 382 SQL> SQL> SELECT * FROM v$archive_gap; THREAD# LOW_SEQUENCE# HIGH_SEQUENCE# ---------- ------------- -------------- 1 383 384 备库archivelog： [oracle@standbydb arch2]$ 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 13 15:06:17 2012 ALTER DATABASE recover managed standby DATABASE disconnect FROM SESSION Tue Nov 13 15:06:17 2012 Attempt TO START background Managed Standby Recovery process (test) MRP0 started WITH pid=19, OS id=13497 Tue Nov 13 15:06:17 2012 MRP0: Background Managed Standby Recovery process started (test) Managed Standby Recovery NOT USING REAL TIME Apply parallel recovery started WITH 2 processes Tue Nov 13 15:06:22 2012 Waiting FOR ALL non-CURRENT ORLs TO be archived... Media Recovery Waiting FOR thread 1 SEQUENCE 383 Fetching gap SEQUENCE IN thread 1, gap SEQUENCE 383-384 Tue Nov 13 15:06:23 2012 Completed: ALTER DATABASE recover managed standby DATABASE disconnect FROM SESSION Tue Nov 13 15:06:54 2012 Redo Shipping Client Connected AS PUBLIC -- Connected User is Valid RFS[3]: Assigned TO RFS process 13596 RFS[3]: IDENTIFIED DATABASE TYPE AS 'physical standby' PRIMARY DATABASE IS IN MAXIMUM PERFORMANCE mode PRIMARY DATABASE IS IN MAXIMUM PERFORMANCE mode RFS[3]: Successfully opened standby log 4: '/oracle/product/oradata/test/redo04.log' Tue Nov 13 15:06:54 2012 RFS[2]: Successfully opened standby log 3: '/oracle/product/oradata/test/redo03.log' Tue Nov 13 15:07:23 2012 FAL[client]: Failed TO request gap SEQUENCE GAP - thread 1 SEQUENCE 383-384 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> ALTER DATABASE recover managed standby DATABASE cancel; DATABASE altered. SQL> SELECT file#,checkpoint_change# FROM v$datafile ORDER BY 1; FILE# CHECKPOINT_CHANGE# ---------- ------------------ 1 740638 2 740638 3 740638 4 740638 5 740638 6 740638 7 740638 8 740638 9 740638 10 740638 11 740638 11 ROWS selected. SQL> SELECT file#,checkpoint_change# FROM v$datafile_header ORDER BY 1; FILE# CHECKPOINT_CHANGE# ---------- ------------------ 1 741134 2 741134 3 741134 4 741134 5 741134 6 741134 7 741134 8 741134 9 741134 10 741134 11 741134 11 ROWS selected. SQL> ALTER DATABASE OPEN READ ONLY; ALTER DATABASE OPEN READ ONLY * 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> ALTER DATABASE CREATE 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 AND REAL 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 bytes Variable Size 209718016 bytes Database Buffers 50331648 bytes Redo Buffers 2924544 bytes RMAN> restore controlfile from '/tmp/backup/standby.ctl'; Starting restore at 13-NOV-12 using target database control file instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: sid=101 devtype=DISK channel ORA_DISK_1: copied control file copy output filename=/oracle/product/oradata/test/control01.ctl Finished restore at 13-NOV-12 RMAN> startup mount database is already started database mounted released 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 - Production With 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 SQL> 最后，我们可以看到，在主库archivelog丢失无法同步到备库时，可以利用增量scn的方式，来避免重建standby。
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