High Availability Data Guard, Sharding and Global Data Services (MOSC)

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Gap Sequence message in alert.log of physical standby after switch back

edited Sep 1, 2009 1:53PM in High Availability Data Guard, Sharding and Global Data Services (MOSC) 8 commentsAnswered
Hi,

We are currently testing switchover / switchback using a 2 node 9i (9.2.0.7) RAC database and a stand alone physical standby database

we first tested the switchover successfully (we shutdown one RAC instance before initiating switch over)

We then tested the switchback so that the 2 node RAC once again becomes the primary database and the stand alone database once again becomes the physical standby database. The switchback process seems to have gone smoothly but on the physical standby alert .log we saw the messages


Failed to request gap sequence. Thread #: 2, gap sequence: 1-4646
All FAL server has been attempted.

Tue Sep 01 11:45:39 2009
ARC1: Evaluating archive   log 16 thread 1 sequence 5404

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