Daily Archives: 2012 年 03 月 13 日

误删除dual表恢复

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1.10G中删除dual表恢复

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

SQL> select object_type,owner from dba_objects where object_name='DUAL';

OBJECT_TYPE         OWNER
------------------- ------------------------------
TABLE               SYS
SYNONYM             PUBLIC

SQL> drop table sys.dual;

Table dropped.

SQL> select object_type from dba_objects where object_name='DUAL';

OBJECT_TYPE
-------------------
SYNONYM

SQL> SELECT SYSDATE FROM dual;
SELECT SYSDATE FROM dual
                    *
ERROR at line 1:
ORA-01775: looping chain of synonyms


SQL> CREATE TABLE XFF AS SELECT * from dba_objects;

Table created.

SQL> drop table xff purge;
drop table xff purge
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-01775: looping chain of synonyms


设置10046跟踪会话发现，在每次删除表操作的时候发现如下错误
select dummy from dual where  ora_dict_obj_type = 'TABLE'

其实这里错误都很明显，是因为dual表不存在了，表对应的同义词还存在，当查询dual的时候，会去查询同义词，然后该同义词去找表，而表不存在，所以出现上述的ORA-01775: looping chain of synonyms错误

2.解决方法

SQL> CREATE TABLE "SYS"."DUAL" 
  2     (       "DUMMY" VARCHAR2(1)
  3     ) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
  4    STORAGE(INITIAL 16384 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  5    PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
  6    TABLESPACE "SYSTEM" ;

Table created.

SQL> GRANT SELECT ON "SYS"."DUAL" TO PUBLIC WITH GRANT OPTION;

Grant succeeded.

SQL> insert into dual values('X');

1 row created.

SQL> COMMIT;

Commit complete.

--编译对象
SQL> @?/rdbms/admin/utlrp.sql

3.测试结果


SQL> select sysdate from dual;

SYSDATE
------------
13-MAR-12

SQL> drop table xff purge;

Table dropped.

rman 备份出现ORA-00245/RMAN-08132

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rman备份出现如下错误

RMAN> backup full  tag 'dbfull' format '/jfkdata1/rman_bak/full_%d_%u' database 
 2>   include current controlfile  plus archivelog  format '/jfkdata1/rman_bak/arch_%d_%u'; 


Starting backup at 13-MAR-12
current log archived
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=297 instance=ykcdb2 device type=DISK
channel ORA_DISK_1: starting archived log backup set
channel ORA_DISK_1: specifying archived log(s) in backup set

input archived log thread=1 sequence=29 RECID=43 STAMP=777808820
input archived log thread=1 sequence=30 RECID=46 STAMP=777816035
input archived log thread=2 sequence=21 RECID=45 STAMP=777816033
channel ORA_DISK_1: starting piece 1 at 13-MAR-12
channel ORA_DISK_1: finished piece 1 at 13-MAR-12
piece handle=/jfkdata1/rman_bak/arch_YKCDB_01n5p1vf tag=DBFULL comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:25
Finished backup at 13-MAR-12

Starting backup at 13-MAR-12
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00002 name=/jfkdata1/oradata/ykcdb/sysaux01.dbf
input datafile file number=00001 name=/jfkdata1/oradata/ykcdb/system01.dbf
input datafile file number=00003 name=/jfkdata1/oradata/ykcdb/undotbs01.dbf
input datafile file number=00005 name=/jfkdata1/oradata/ykcdb/undotbs02.dbf
input datafile file number=00004 name=/jfkdata1/oradata/ykcdb/users01.dbf
channel ORA_DISK_1: starting piece 1 at 13-MAR-12
channel ORA_DISK_1: finished piece 1 at 13-MAR-12
piece handle=/jfkdata1/rman_bak/full_YKCDB_02n5p209 tag=DBFULL comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:25
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
including current control file in backup set
including current SPFILE in backup set
channel ORA_DISK_1: starting piece 1 at 13-MAR-12
channel ORA_DISK_1: finished piece 1 at 13-MAR-12
piece handle=/jfkdata1/rman_bak/full_YKCDB_03n5p213 tag=DBFULL comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 13-MAR-12

Starting backup at 13-MAR-12
current log archived
using channel ORA_DISK_1
channel ORA_DISK_1: starting archived log backup set
channel ORA_DISK_1: specifying archived log(s) in backup set
input archived log thread=2 sequence=22 RECID=48 STAMP=777816102
input archived log thread=1 sequence=31 RECID=47 STAMP=777816101
channel ORA_DISK_1: starting piece 1 at 13-MAR-12
channel ORA_DISK_1: finished piece 1 at 13-MAR-12
piece handle=/jfkdata1/rman_bak/arch_YKCDB_04n5p217 tag=DBFULL comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 13-MAR-12
ORA-00245: control file backup operation failed

RMAN-08132: WARNING: cannot update recovery area reclaimable file list

RMAN>

从这里可以看出数据库文件，归档日志，spfile和controlfile都备份完成，后面又出现一个controlfile失败，应该是控制文件快照备份失败。

错误原因

RMAN creates a copy of the control file for read consistency, this is the snapshot controlfile. 
Due to the changes made to the controlfile backup mechanism in 11gR2 any instances 
in the cluster may write to the snapshot controlfile. Therefore, 
the snapshot controlfile file needs to be visible to all instances.

The same happens when a backup of the controlfile is created directly from 
sqlplus any instance in the cluster may write to the backup controfile file.

In 11gR2 onwards, the controlfile backup happens without holding the control file enqueue. 
For non-RAC database, this doesn't change anything. 

But, for RAC database, the snapshot controlfile location 
must be in a shared file system that will be accessible from all the nodes.

The snapshot controlfile MUST be  accessible by all nodes of a RAC database.

大致意思就是rman的snapshot controlfile必须放在共享存储之上。

解决方法

The snapshot controlfile MUST be accessible by all nodes of a RAC database, 
if the snapshot controlfile does not reside in on a shared device this error will raise.

1. Check the snapshot controlfile location:
RMAN> show all;

2. Configure the snapshot controlfile to a shared disk:
RMAN> CONFIGURE SNAPSHOT CONTROLFILE NAME TO '<shared_disk>/snapcf_<DBNAME>.f';