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RE: Question On Statistics Gathering

From: Goulet, Dick <DGoulet_at_vicr.com>
Date: Fri, 27 Jun 2003 13:22:25 -0700
Message-ID: <F001.005BB5E1.20030627125952@fatcity.com>


Dennis,

        There has been a substantial amount of discussion on this subject in the past, you might want to go look at the archives. But to directly answer your questions:

  1. I'm not having a problem with it (8.1.7.4)
  2. NO.

Dick Goulet
Senior Oracle DBA
Oracle Certified 8i DBA

-----Original Message-----
Sent: Friday, June 27, 2003 4:34 PM
To: Multiple recipients of list ORACLE-L

Hi All,
Currently we have a very large database ( 8.1.7.4 ) on Tru64 that is having query optimization problems. Lacking good, up-to-date statistics is the main cause of it. Because of the size and availability window we can't afford to analyze the whole schema. Now 8i has
a new feature that only gathers stats when stale. You have to set table to monitoring mode first.
I am intrigued by this new feature and am reading up on it and have 2 questions: 1. How reliable and bug-free is this feature? 2. We do a lot of sqlldr direct path, which bypasses table insert. Will this feature catch the rows inserted that way?

TIA
Dennis
-----Original Message-----
Sent: Friday, June 27, 2003 2:30 PM
To: Multiple recipients of list ORACLE-L

One of our third party applications gave us the following message:

ORA-04031: unable to allocate 4192 bytes of shared memory

Environment is Oracle 8.1.7 on AIX 4.3.2

The output from "select * from v$sgastat showed about 3 mb free out of a total of 40 mb of shared pool. I increased the size of shared pool to 60 mb and started to watch the "shared pool"/"free memory" value in v$sgastat. It seems to vary between about 3 and 11 mb.

  1. What is the application likely to be doing that requires it to allocate shared pool?
  2. How do I know when I have the shared pool value in init.ora set high enough so that I won't get the ORA-04031 errors?
  3. Is there any other init.ora parameter I ought to be looking at here?

Thanks,
Peter Schauss
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Author: Schauss, Peter
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Author: Meng, Dennis
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Author: Goulet, Dick
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