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Finding Oracle instances

I want to find out how many Oracle instances (SIDs) are created on any machine. If I use the command "Select * from v$database" I get only the current instance name in the output.

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If you are running Oracle on a Windows server, go to Control Panel->Administrative Tools->Services. Look for any services titled OracleServiceSID. The word SID will be replaced by your ORACLE_SID database identifier.

If you are running Oracle on a Unix/Linux server, look for your oratab file (typically in /var/opt/oracle or /etc). It will contain an entry for each Oracle instance on that server.

This was first published in August 2005

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