Do you need RAC?

• Using RAC where you don't have OJVM installed mostly gives you zero downtime patching (but there will be exceptions).

• RAC is also a solution for scaling out (adding more smaller servers) when scaling up (making your big server bigger) is not an option.

• Many other features of RAC can be achieved with less cost and complexity using Data Guard.

• Virtualisation can also work well, but does introduce license complexity.

Oracle RAC One Node

Check

srvctl -V

crsctl query crs softwareversion

crsctl check cluster

sqlplus / as sysdba

SHOW PARAMETER cluster_database;

SHOW PARAMETER cluster_database_instances

SHOW PARAMETER cluster_interconnects

Bibliography