https://www.oraclescripts.com/tags/vdataguard_process/Recent content in V$dataguard_process on Oracle ScriptsHugo -- gohugo.ioenOracleScripts.comSat, 03 Jan 2026 00:00:00 +0000https://www.oraclescripts.com/post/check-oracle-data-guard-standby-synchronization-status/Sat, 03 Jan 2026 00:00:00 +0000https://www.oraclescripts.com/post/check-oracle-data-guard-standby-synchronization-status/ <h2 id="check-oracle-data-guard-standby-synchronization-status">Check Oracle Data Guard Standby Synchronization Status</h2> <h2 id="purpose">Purpose</h2> <p>Is the physical standby caught up with the primary? The fastest first answer is a pair of numbers: the log sequence the primary is writing now, and the newest log sequence the standby has applied. If the two are close, redo is flowing and being applied. If the gap is growing, something between the primary and the standby needs attention.</p> <p>The queries below produce those two numbers. They are a quick check, not a full health report. Later sections explain what each query reads, where it can mislead, and which Oracle views give a more exact answer for lag and gaps. A standby that is behind is a recovery risk, because a failover would lose the redo that has not yet arrived or been applied.</p>