RE: Execution time in SHARED SERVER vs. DEDICATED SERVER (RAC 10gR2)

I missed that mark completely - I interpreted the 1:30 to mean an hour 30 and missed the "1:30 min" in the original post. I have generally seen that behaviour only when you have a lot of requests coming in and it takes a while to create the process and consequently the shared server tends to be substantially faster.

I would think that there would be other symptoms, should this be the case - a simple sqlplus session should take a long while to create and execute as well. Or high CPU utilization in the dedicated server mode vs shared.

The other aspect that could be factoring in with a shared server is connection pooling and multiplexing which from what I remember kicks in when you are in Shared Server mode with connections coming in from the same node.

... a long shot

-Krish

-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Martin Klier
Sent: Wednesday, April 23, 2008 11:49 AM To: Yong Huang; oracle-l
Subject: Re: Execution time in SHARED SERVER vs. DEDICATED SERVER (RAC 10gR2)

Hi,

Yong Huang schrieb:
> Execution in shared server is even faster than dedicated? Not the other
way
> around?

No, shared is faster, dedicated is factors of 10 slower. Other way round I wouldn't have messed around, nobody wants to execute this statements in shared server mode - we found out about shared mode "by accident" when we tried this from our web server and it was faster there.

> What're the major wait events for the session in both cases?
90% of the time: CPU. In shared mode for seconds, in dedicated mode for hours. ADDM via Grid Control didn't find anything smelly.

Any ideas out of that? I am stumped at the moment :( Thanks
Martin

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