RE: Standby Database performance

From: Chitale, Hemant Krishnarao <>
Date: Thu, 24 Nov 2011 09:51:36 +0800
Message-ID: <>

Have you tried actually *reducing* the degree of parallelism ? A high degree of parallelism causes the PQ slaves to interfere with each other in a Recovery scenario. This particularly happens with large transactions that update many indexes and then issue ROLLBACKs.

See Oracle Support article
How to Disable Parallel Transaction Recovery When Parallel Txn Recovery is Active --- 238507.1 Parallel Rollback may hang database, Parallel query servers get 100% cpu --- 144332.1


Hemant K Chitale

-----Original Message-----
From: [] On Behalf Of kapil vaish Sent: Wednesday, November 23, 2011 3:24 AM To:
Subject: Standby Database performance

Hi Guys ,

we have physical standby database for one of our biggest database. Scripts ship the archived log to standby server and then using parallel 32, manual recovery is performed (thru scripts) . Archived log size is 2 GB and daily production archive generation is aorund 2.5 TB. We are trying to increase performance on our standby database. We tried tuning various standby related parameters and IO, maximum apply rate we could achieve is 45 sec per archive log.  Can you suggest any other tunings you may have seen in your environments ? any pointers are appreciated ..

kapil Vaish

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Received on Wed Nov 23 2011 - 19:51:36 CST

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