ORA-01102: cannot mount database in EXCLUSIVE mode

I received this error message when I was trying to mount the primary database in my dataguard configuration.

SQL> alter database mount;
alter database mount
*
ERROR at line 1:
ORA-01102: cannot mount database in EXCLUSIVE mode

Here is how I resolved it:

- Shutdown the primary database

SQL> shu immediate;
ORA-01507: database not mounted

– Find out all the processes belonging to the database still running

[oracle@EDP1R3P0-pc00sby1 dbs]$ ps -ef |grep ora_|grep pc00sb

– Kill all the processes

[oracle@EDP1R3P0-pc00sby1 dbs]$ kill -9 32231

– Check that there are no more processes running

[oracle@EDP1R3P0-pc00sby1 dbs]$ ps -ef |grep ora_|grep pc00sb

– startup the database – succeeeds

SQL> startup
ORACLE instance started.

Total System Global Area  439406592 bytes
Fixed Size                  1337072 bytes
Variable Size             348129552 bytes
Database Buffers           83886080 bytes
Redo Buffers                6053888 bytes
Database mounted.
Database opened.

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5 thoughts on “ORA-01102: cannot mount database in EXCLUSIVE mode

  1. Thanks…But every time I restart my server, the same problem returns. How to get rid of this problem once and for all. Thanks again ..in advance.

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