startup mount exclusive

Question

What does the following command do?

startup mount **exclusive**;

Solution

Deprecated .. now use STARTUP MOUNT

http://psoug.org/reference/start_stop.html

If your Oracle server allows multiple instances to access a single database concurrently (Oracle Parallel Server option), choose whether to mount the database exclusively or in parallel.

If you specify EXCLUSIVE (the default), then the database can only be mounted and opened by the current instance.

Taken from: http://download.oracle.com/docs/cd/A87860_01/doc/server.817/a76956/start.htm#6155