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Re: INSERT...SELECT pegs CPU, but is waiting on scattered read?

From: Mladen Gogala <>
Date: Thu, 29 Apr 2004 15:41:21 -0400
Message-ID: <>

On 04/29/2004 03:08:59 PM, Cary Millsap wrote:
> If you can still connect to Oracle, you'll probably see a tremendous
> amount of activity reflected in V$SESS_IO.BLOCK_GETS and
> ~.CONSISTENT_GETS. Cut the SELECT statement into a SQL*Plus session and
> go to work on "tuning the SQL." This (a SQL tuning issue) is almost
> undoubtedly the cause of your problem.

But he has the perfect BCHR now! This is the illustration for your "method R". He has the perfect BCHR and he's an unhappy camper, to say the least. I have one more question: is CPU being spent in system or user mode? If the CPU is spent in the system mode and you don't have logical I/O, then may be you are paging (a.k.a "thrashing").

Mladen Gogala
Oracle DBA

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Received on Thu Apr 29 2004 - 14:38:44 CDT

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