手工 RAC Archive , flashback
ALTER SYSTEM SET LOG_ARCHIVE_DEST_1='LOCATION=+WEBLOG/' SCOPE=SPFILE SID='*';
OR
ALTER SYSTEM SET LOG_ARCHIVE_DEST_1='LOCATION=USE_DB_RECOVERY_FILE_DEST' SCOPE=SPFILE SID='*';
ALTER SYSTEM SET CLUSTER_DATABASE=FALSE SCOPE=SPFILE SID='WEBDB1';
SHUTDOWN ALL INSTANCES
WEBDB1 , STARTUP MOUNT
ALTER DATABASE ARCHIVELOG;
ALTER DATABASE FLASHBACK ON;
SELECT FLASHBACK_ON,CURRENT_SCN FROM V$DATABASE;
ALTER SYSTEM SET CLUSTER_DATABASE=TRUE SCOPE=SPFILE SID='*';
RESTART ALL INSTANCES
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