怎么获得数据库的DBID
日期：2014-05-16 浏览次数：20474 次
DBID作用：
1 当丢失了控制文件时，进行自动恢复数据时用到DBID.
RMAN> restore controlfile from autobackup;
启动 restore 于 15-2月 -08
使用通道 ORA_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 02/15/2008 00:43:38
RMAN-06495: must explicitly specify DBID with SET DBID command
2 进行rman恢复时，有时也用到DBID.
3 oracle自动控制文件也用DBID做文件名
4 DBID存在于数据文件及控制文件中
?
在进行数据库恢复的过程中,很多时候我们需要知道Oracle数据库的DBID,通常有以下几种方法可以获得数据库的DBID.
1.查询v$database获得
由于DBID在控制文件和数据文件中都存在记录,所以如果能够mount数据库就可以查询v$database视图获得.
SQL> alter database mount;
Database altered.
SQL> select dbid from v$database;
????? DBID
----------
3152029224
2.在nomount状态时
如果数据库配置了自动控制文件备份(Oracle9i),并且名称是缺省的,那么我们可以从自动备份文件获得DBID.
[oracle@jumper dbs]$ cd $ORACLE_HOME/dbs
[oracle@jumper dbs]$ ll c-*
-rw-r----- 1 oracle dba 3375104 Dec 21 11:13 c-3152029224-20051221-00
-rw-r----- 1 oracle dba 3358720 Jan 21 14:03 c-3152029224-20060121-00
-rw-r----- 1 oracle dba 3358720 Jan 21 14:08 c-3152029224-20060121-01
这里的3152029224就是DBID。在10g中，使用Flash Recovery Area，则没有这个命名规则。
需要或缺DBID进行恢复通常是因为丢失了所有的控制文件.在恢复时会遇到错误.
[oracle@jumper dbs]$ rman target? /
Recovery Manager: Release 9.2.0.4.0 - Production
Copyright (c) 1995, 2002, Oracle Corporation.? All rights reserved.
connected to target database: conner (not mounted)
RMAN> restore controlfile from autobackup;
Starting restore at 05-FEB-06
using target database controlfile instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=11 devtype=DISK
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of restore command at 02/05/2006 20:47:25
RMAN-06495: must explicitly specify DBID with SET DBID command
如果存在自动备份,我们通常可以直接恢复控制文件,mount数据库之后就好办了:
RMAN> restore controlfile from '/opt/oracle/product/9.2.0/dbs/c-3152029224-20051221-00';?
Starting restore at 05-FEB-06
using channel ORA_DISK_1
channel ORA_DISK_1: restoring controlfile
channel ORA_DISK_1: restore complete
replicating controlfile
input filename=/opt/oracle/oradata/conner/control01.ctl
output filename=/opt/oracle/oradata/conner/control02.ctl
output filename=/opt/oracle/oradata/conner/control03.ctl
Finished restore at 05-FEB-06
4.直接从幸存的文件中读取
由于DBID存在于数据文件及控制文件中,所以我们可以通过PL/SQL程序直接从文件中读取:
SQL> select eygle.get_dbid('/opt/oracle/oradata/conner','user02.dbf') from dual;?其实更简单的，用BBED就好了
EYGLE.GET_DBID('/OPT/ORACLE/OR
------------------------------
3152029224
SQL> select dbid from v$database;
DBID
----------
3152029224
