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Start Logical Oracle instance apply tips

Oracle Database Tips by Donald BurlesonDecember 9, 2015


Oracle Data Guard - Log Management Services

Physical Standby Database

The following diagram shows various processes of log management services on the physical standby database. In this diagram, log writer is used to transfer redo log entries from the primary to the standby database. Also, standby redo logs are created and used at the standby site.  A log switch on the primary database triggers archiving on the standby database.

Figure 5.2 - Log management service on physical standby database

Logical Standby Database

The logical Oracle instance provides a unique feature in which a database can coexist in recovery and query mode simultaneously. The log apply service on a logical Oracle instance uses the LogMiner engine of Oracle database. When the log apply service is initiated on the standby database, the LogMiner engine reads the archived redo logs from the standby_archive_dest directory and converts these redo logs into SQL statements. These statements are then applied to Oracle instance by SQL Apply operations. The log apply service can be started using:


When this statement is executed in the standby database, it starts a Logical Standby Process (LSP) which controls the MRP on the standby site.

The following diagram shows the complete log management service on a logical standby database. In this case, LGWR is configured for log transport.

Figure 5.3 - Showing Log Management Services on Logical Standby Database

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

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