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Don Burleson Blog 







Data Guard v$ view tips

Oracle Database Tips by Donald BurlesonDecember 9, 2015

The DBA tables to monitor Data Guard

Since, unlike the physical standby database, the logical Oracle instance is open for query during the recovery process, there is an option to query static views to extract information about logical standby processes. The following three views can be used for this purpose:

  • dba_logstdby_progress - The dba_logstdby_progress view holds the information about the overall progress of the log apply service on the standby site.

  • dba_logstdby_log - The dba_logstdby_log view has extensive information about individual archived logs. The timestamp column of dba_logstdby_log  shows the time when archived log file was received on the standby site. The dba_logstdby_log view can be used in diagnosing issues with the log transfer service.

  • dba_logstdby_events - The view dba_logstdby_events shows events affecting the SQL Apply operations are recorded in dba_logstdby_events. This dba_logstdby_events should be the starting point in diagnosing problems with the SQL Apply operations. The dba_logstdby_events view holds 100 records by default, and the dfault number of records can be changed using the dbms_logstdby package.

In addition to the above-mentioned views specially designed for the logical standby database, the dynamic performance views holding information about LogMiner activities can be used to find out if the SQL Apply operation is performing as expected.

The above text is an excerpt from the book: Oracle Data Guard Handbook

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