FIND THE ARCHIVE LAG BETWEEN PRIMARY AND STANDBY

select LOG_ARCHIVED-LOG_APPLIED “LOG_GAP” from
(SELECT MAX(SEQUENCE#) LOG_ARCHIVED
FROM V$ARCHIVED_LOG WHERE DEST_ID=1 AND ARCHIVED=’YES’),
(SELECT MAX(SEQUENCE#) LOG_APPLIED
FROM V$ARCHIVED_LOG WHERE DEST_ID=2 AND APPLIED=’YES’);

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