Failover a standby database
Check archive log gaps
SELECT THREAD#, LOW_SEQUENCE#, HIGH_SEQUENCE# FROM V$ARCHIVE_GAP;
ALTER DATABASE REGISTER PHYSICAL LOGFILE ‘filespec1‘;
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE FINISH FORCE;
ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY;
ALTER DATABASE OPEN; OR SHUTDOWN IMMEDIATE and STARTUP;
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