解决rman无法自动删除过期备份和归档

rman的删除语句如下：

run {

delete noprompt obsolete;

crosscheck backup;

delete noprompt expired backup;

crosscheck archivelog all;

delete noprompt expired archivelog all;

delete noprompt archivelog all completed before 'SYSDATE - 7';

}

之前正常，一段时间之后发现过期的备份和归档日志没有自动删除。

查看过期发现报错：

RMAN> report obsolete;

RMAN retention policy will be applied to the command

RMAN retention policy is set to redundancy 1

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-03002: failure of report command at 01/25/2010 10:01:02

ORA-01775: looping chain of synonyms

（在之前发生过删除表空间，导致部分挪到该表空间上的数据字典表等被删除的事情。）

debug该语句：

rman target / log rman.log trace rman.trc debug

RMAN> run {

2> debug on;

3> report obsolete;

4> debug off;

5> }

RMAN> exit

view rman.trc

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-03002: failure of report command at 01/26/2010 13:49:40

RMAN-06003: ORACLE error from target database:

ORA-01775: looping chain of synonyms

RMAN-06097: text of failing SQL statement: select min(required_checkpoint_scn) ,min(source_resetlogs_scn) into :b1,:b2 from dba_capture where capture_type='LOCAL'

RMAN-06099: error occurred in source file: krmk.pc, line: 19284

DBGMISC: ENTERED krmkursr [13:49:40.492]

发现dba_capture 同义词确实存在问题。

找到该同义词创建脚本：

cd $ORACLE_HOME/rdbms/admin

grep DBA_CAPTURE *

确认为catcap.sql脚本

在测时间上安装该脚本，发现不会对系统产生影响，于是重新执行该脚本。

sqlplus / as sysdba

@catcap.sql

dba_capture 同义词正常。

重新执行删除过期语句，删除成功。

注：通过debug方式可以解决很多rman的问题。