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Hi Yanwen,
Step 1 is to have a good read of the Administration Guide
Step 2 is to change the ORACLE_SID environment variable to the appropriate name of the second DB (ORACLE_SID=name);
Step 3 is to logon into sqlplus with sysdba privileges and issue the startup command. Assuming the second db has its spfile/pfile has the default name/location, it will start the second database.
Step 4 is let us know how you went.
Cheers
Richard
yanwen wrote:
>
> I just install Oracle9i in redhat linux7.3, and I create 2 databases.
>
> But I only know mount 1 database one time. How to mount 2 database
> concurrently?
>
> Any step by step documents i can follow? Thanks!