解决rac错误 ORA-01102: cannot mount database in EXCLUSIVE mode

启动 Oracle  11g RAC数据库时出现以下错误。只能启动其中一个节点（rac01）,另一个节点启动不了（rac02）。可能是以前修改cluster_database这个参数引起的。在Oracle RAC架构这个参数必须设置为TRUE。

执行startup时候，错误信息: ORA-01102: cannot mount database in EXCLUSIVE mode

解决方法:

rac01节点:

SQL> show parameter cluster_database;

NAME                                             TYPE          VALUE

------------------------------------            -----------      ------------------------------

cluster_database                            boolean      FALSE

cluster_database_instances           integer        1

SQL> alter system set cluster_database=true scope=spfile;

System altered.

SQL>  shutdown immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area 1068937216 bytes

Fixed Size                  2260088 bytes

Variable Size             734004104 bytes

Database Buffers          327155712 bytes

Redo Buffers                5517312 bytes

Database mounted.

Database opened.

SQL> select open_mode from v$database;

OPEN_MODE

--------------------

READ WRITE

SQL> show parameter cluster_database;

NAME                                            TYPE        VALUE

------------------------------------           -----------    ------------------------------

cluster_database                           boolean     TRUE

cluster_database_instances           integer      2

SQL>

rac02节点:

[oracle@fanxin02 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Tue May 21 23:08:16 2019

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> startup ORACLE instance started.

Total System Global Area 1068937216 bytes

Fixed Size                  2260088 bytes

Variable Size             734004104 bytes

Database Buffers          327155712 bytes

Redo Buffers                5517312 bytes

Database mounted.

Database opened.

SQL> show parameter cluster_database;

NAME                                 TYPE        VALUE

------------------------------------ ----------- ------------------------------

cluster_database                     boolean     TRUE

cluster_database_instances           integer     2

SQL>

SQL> archive log list;

Database log mode              Archive Mode

Automatic archival             Enabled

Archive destination            /u01/app/oracle/product/11.2.0.4/db_1/dbs/arch

Oldest online log sequence     12

Next log sequence to archive   13

Current log sequence               13

SQL>

 出自：http://blog.itpub.net/31562900/viewspace-2564139