Since I really don't have any performance issues [2 Nodes, 2CPUs each @1GHz, 2GB, ES45 Tru64Cluster],
I haven't been runnning StatsPack.
However I just ran two snapshots and didn't see such a wait event.
I'm sure that other people have also implemented mcpd=0 successfuly [my 9iRAC is an Export-Import upgrade from an 8.1.5 OPS environment, where, too, the earlier DBA had set mcpd=0, with some additional parameters because of a bug in 8.1.5OPS]. Hemant
At 08:24 AM 19-06-03 -0800, you wrote:
With MPCD=0, Is your primary wait event shown as "on-going reading of SCN to complete" in the statspack reports? Oracle Support insisted we set it to 7 coz of this.
Raj
"K
Gopalakrishnan To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
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Hemant:
You are right. 7 seconds is the MAX difference, but the control files are synced every 3 seconds during the 'split brain' check. So most of the cases, it is 3 seconds with the maximum of 7 seconds subject to the MCPD settings.
KG
Best Regards, K Gopalakrishnan
-----Original Message----- Hemant K Chitale Sent: Thursday, June 19, 2003 5:38 AM To: Multiple recipients of list ORACLE-L
Although MCPD may default to 700centiseconds [although I have seen a much lower value on 9.2 on Tru64], in most cases, delays of 7seconds don't occur [and shouldn't be acceptable ?!].
I do have a 9iRAC environment but am comfortably using mcpd=0. And I have AQ in an 8.1.7 single-instance environment. So I can't make any statements about AQ in OPS/RAC !
Hemant
At 07:05 AM 17-06-03 -0800, you wrote:
A colleague casually mentioned that in RAC, the test to de-queue an AQ set-up from BOTH instances didn't succeed. The side where we were enqueuing was able to see queued messages faster than the 'other' side. About 7-8 seconds ... that got me thinking ... is this an effect of MCPD which defaults to like 7 seconds?
Do you use AQ in RAC and enqueue/dequeue on both nodes? What is your experience?
ps: mcpd - max commit propagation delay TIA Raj
--------------------------------------------------------------------------------
Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !
Hemant K Chitale
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