竟然遇上了ORACLE的BUG
2011-01-19
介绍：在创建物理standby的过程中，不想遇上了BUG.
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BUG表现
RMAN> list backupset 173;
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ -------------------
173 Full 6.92M DISK 00:00:01 2011-01-19 19:31:20
BP Key: 173 Status: AVAILABLE Compressed: NO Tag: TAG20110119T193119
Piece Name: /u02/flash_recovery_area/ORCL/backupset/2011_01_19/o1_mf_ncnnf_TAG20110119T193119_6mflw89s_.bkp
Standby Control File Included: Ckp SCN: 4813785 Ckp time: 2011-01-19 19:31:19
RMAN> @dup_standby.rman
RMAN> run
2> {
3> set newname for datafile 1 to '/u03/oradata/orcl02/system01.dbf';
4> set newname for datafile 2 to '/u03/oradata/orcl02/undotbs01.dbf';
5> set newname for datafile 3 to '/u03/oradata/orcl02/sysaux01.dbf';
6> set newname for datafile 4 to '/u03/oradata/orcl02/users01.dbf';
7> set newname for datafile 5 to '/u03/oradata/orcl02/example01.dbf';
8> set newname for datafile 6 to '/u03/oradata/orcl02/test_tbsp.dbf';
9> set newname for datafile 7 to '/u03/oradata/orcl02/test.dbf';
10> set newname for datafile 8 to '/u03/oradata/orcl02/test02.dbf';
11>
12> duplicate target database for standby dorecover;
13> }
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
Starting Duplicate Db at 2011-01-19 19:32:51
using channel ORA_AUX_DISK_1
contents of Memory Script.:
{
set until scn 4788916;
restore clone standby controlfile;
sql clone 'alter database mount standby database';
}
executing Memory Script
executing command: SET until clause
Starting restore at 2011-01-19 19:32:51
using channel ORA_AUX_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 01/19/2011 19:32:51
RMAN-03015: error occurred in stored script. Memory Script
RMAN-06026: some targets not found - aborting restore
RMAN-06024: no backup or copy of the control file found to restore
RMAN> **end-of-file**
RMAN>
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原因分析
《Oracle Data Guard 11g Handbook》中这样解释：The problem is that RMAN sets the SCN to restore to, it sets it
too low and the backup save set with you standby control file in it cannot be used.
即RMAN设置的恢复SCN太低，于是包含standby控制文件的备份集就无法使用。
我们这个例子中，RMAN设置的恢复SCN=4788916,而standby控制文件中的SCN=4813785（backupset 173），确实RMAN的低。
顺便看一下当前系统logfile的SCN：
19:37:45 SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARCHIV STATUS FIRST_CHANGE# FIRST_TIME
---------- ---------- ---------- ---------- ---------- ------ -------------------------------- ------------- -------------------
1 1 21 52428800 2 NO CURRENT 4788916 2011-01-18 22:20:25
2 1 19 52428800 2 YES INACTIVE 4738420 2011-01-17 14:48:04
3 1 20 52428800 2 YES INACTIVE 4784288 2011-01-18 22:00:25
20:05:43 SQL>
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解决方法
解决方法很简单，只要做一次switch logfile，让RMAN的恢复SCN比standby控制文件中的SCN大，之后重新运行duplicate.
20:08:04 SQL> alter system switch logfile;
系统已更改。
20:08:11 SQL> select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARCHIV STATUS FIRST_CHANGE# FIRST_TIME
---------- ---------- ---------- ---------- ---------- ------ -------------------------------- ------------- -------------------
1 1 21 52428800 2 NO ACTIVE 4788916 2011-01-18 22:20:25
2 1 22 52428800 2 NO CURRENT 4815502 2011-01-19 20:08:11
3 1 20 52428800 2 YES INACTIVE 4784288 2011-01-18 22:00:25
20:08:13 SQL>
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BUG修复情况
该BUG在10.2.0.4的版本中修复。
我的版本是：
20:08:13 SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE 10.2.0.1.0 Production
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
20:10:33 SQL>
竟然遇上了ORACLE的BUG
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lk-2010
2011-01-19 20:52:56 -
Linux操作系统
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