Database Terminated With ORA-27300/ORA-27301/ORA-27302/ORA-27303

Hello friends, so again I faced some issue after creating a new database using DBCA and using RMAN duplicate, so here is my observation and solution to the issue

Cause :

1] During the DBCA execution the permission of the oracle executable in the $ORACLE/bin/oracle has changed from oracle:oinstall to the owner of the asm disk i.e . oracle: asmadmin

-rwsr-s--x 1 oracle asmadmin 385832552 Mar 27 23:49 oracle

(There will be a possibility that the $ORACLE/bin/oracle retains the permission as oracle:oinstall after patching )

Oracle RAC background processes.

The GCS and GES processes, and the GRD collaborate to enable Cache Fusion. The Oracle RAC processes and their identifiers are as follows:

1. ACMS: Atomic Controlfile to Memory Service (ACMS)

In an Oracle RAC environment, the ACMS per-instance process is an agent that contributes to ensuring a distributed SGA memory update is either globally committed on success or globally aborted if a failure occurs.