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Home -> Community -> Mailing Lists -> Oracle-L -> RE: AQ, RAC and delay
I haven't tried with mcpd=0 yet ...
Raj
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 19, 2003 12:25 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: AQ, RAC and delay
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]>
" cc:
<[EMAIL PROTECTED] Subject: RE: AQ, RAC and delay
o.com>
Sent by:
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ity.com
06/19/2003
10:29 AM
Please respond
to ORACLE-L
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 comAll 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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