Oracle Data Guard: Difference between revisions

Revision as of 17:45, 19 April 2014

Revision as of 15:12, 30 May 2014

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| origyear = 1999

| year = 2012

| publisher = OacleOracle Corporation

| quote = Role Transitions [...] An Oracle database operates in one of two roles: primary or standby. Using Data Guard, you can change the role of a database using either a switchover or a failover operation.

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| quote = ... sending processes (LNS and ARC) on the production database....The Data Guard LNS process on the production database performs a network send to the Data Guard RFS process on the standby database.

}}</ref> where the '''RFS''' (remote file server) background process within the Oracle instance performs the task of receiving archived redo- logs originating from the primary database.

Alternatively, a supplementary mechanism may transfer the archived redo logs. On the standby database a Fetch Archive Log ('''FAL''') client monitors for gaps in the sequence of received logs. If it finds a gap, it may invoke one or more Fetch Archive Log (FAL) servers to run on the primary database to forward the missing item(s).<ref>

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</ref>

Once the archived redo logs have arrived, other processes (such as an '''ARCH''' (Archiverarchiver process), an '''MRP''' (Managed Recovery Process<ref>

{{cite book

| last = Ault