如何获取Oracle DBID，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$database视图获得。
1.查询v$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
----------
1363251591
Oracle 10g中获取DBID
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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-1363251591-20051221-00
-rw-r----- 1 oracle dba 3358720 Jan 21 14:03 c-1363251591-20060121-00
-rw-r----- 1 oracle dba 3358720 Jan 21 14:08 c-1363251591-20060121-01
这里的1363251591就是DBID。在10g中，使用Flash Recovery Area，，则没有这个命名规则。
3.从自动备份中恢复
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-095: 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-1363251591-20051221-00';
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
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