Oracle: Am I on a RAC?

Question

What query can I perform to determine if I am running on a RAC system? If I'm on a RAC, I need to query from GV$* rather than V$*.

Answer 1

You can check the value of the CLUSTER_DATABASE parameter:

SQL> select name, value from v$parameter where name = 'cluster_database';

NAME                  VALUE
--------------------- ---------------------
cluster_database      TRUE 

According to the Oracle Database Reference:

CLUSTER_DATABASE is an Oracle RAC parameter that specifies whether or not Oracle RAC is enabled.