Single instance with two sons to redo

Hallo,

I have a 10.2.0.4 single Instance with 2 threads again by following query shows:

Select thread #, status, active, groups of wire $ v

THREAD # STATUS ACTIVE GROUPS
1 PUBLIC OPEN 3
CLOSED 2 3 PUBLIC


That's because it's disk-synchronized with a RAC database, so I can not get a wire 2. (For example need recovery at startup)

In any case, I noticed that the Thread 2 Redo Logs switch once all TWO Redo Log Thread 1 switch and without
journal entry of alerts on the log command, instead of switching with Redo Logs in 1 thread.
In other words, as archiving is, thread of Redo log 2 get archived twice as long.


Is this expected behavior?

Thank you!!!

In the CCR, if a thread is more active than the other and switches logs frequently, it will force also a switch of newspaper to the other thread sometimes to make sure the second thread does not lag behind . This is to ensure that the repeat of the second thread also gets archived on.

Imagine what would happen if:
a. thread 1 is 100 000 transactions on 9 switches Journal (SEQ #101 à 109), using 3 groups
b. thread 2 does 1 single operation without switch (still stuck in SEQ #99) unique newspaper (at some time where 1 wire was active in the #102 SEQ) and do not archive

Restore database and recovery or a database of aid would put an end to the Seq 2 wire #99 (approx. Seq # 101 Thread 1). Cannot apply 90 000 + transactions in SEQ # 102 to 109 because Oracle does not have time to order operations, if missing redo thread 2.

To avoid such a situation, 1 wire would be periodically (about every 2-3 switches, if there are 3 groups) force an automatic switch redo log groups of 2 wire to make sure that they get archived on!

Hemant K Collette
http://hemantoracledba.blogspot.com

Tags: Database

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