Sometimes you need to disconnect Standby Database, Or even Delete the Configuration And let the primary Is StandAlone Database to do that you have Temporary way or Permanet Way :
1 – Temporary :
Run the below command in standby Database:
SQL> alter database recover managed standby database cancel;
2- Permant With The Following Steps :
Run the below command in standby Database:
SQL> alter database recover managed standby database cancel;
Shutdown Standby Database.
change the parameters LOG_ARCHIVE_DEST_n/LOG_ARCHIVE_CONFIG (if set).
Remove tnsnames.ora for standby In primary Database.
Thank you
Osama mustafa