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Re: SEGMENT SPACE MANAGEMENT AUTO hangs on 9.2.0.4 on Linux

From: Richard Foote <richard.foote_at_bigpond.com>
Date: Mon, 29 Sep 2003 14:49:39 -0800
Message-ID: <F001.005D1665.20030929144939@fatcity.com>


MessageHi Mladen,

Because when you insert a row, Oracle has absolutely no idea by how much it might grow (should the insertion of that 18th row use up the remaining space in the block or should we save some, who's to know ...). Therefore the setting of some magic PCTFREE is not supported. Forget about PCTUSED, FREELISTS and FREELIST GROUPS but ASSM doesn't support the forgetting of PCTFREE.

Cheers

Richard

  And why not? Forgetting about PCTFREE/PCTUSED is the main point of automatic segment space management.   Initial/next are resolved by using LMT, because that's what takes care of your extent sizes.

  --
  Mladen Gogala
  Oracle DBA

    -----Original Message-----
    From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com] On Behalf Of Richard Foote     Sent: Monday, September 29, 2003 11:55 AM     To: Multiple recipients of list ORACLE-L     Subject: Re: SEGMENT SPACE MANAGEMENT AUTO hangs on 9.2.0.4 on Linux

    Hi Mladen,

    I can't help you with your problem, I haven't had the pleasure on NT or Tru64 but I just wanted to point out that you can't forget about PCTFREE even with ASSM.

    Cheers

    Richard

      I have RDBMS 9.2.0.4 on RH 7.3 and I executed the following command:

      create tablespace wizard
      datafile '/oradata/WIZ/wizard01.dbf' size 3072M reuse
      autoextend on next 1024M maxsize 16385m
      extent management local autoallocate
      segment space management auto;

      The whole system just hung, doing I/O like crazy.  I was unable to killl one of the server processes
      which survived even shutdown abort, so I had to bounce thw whole box. No errors, no traces, no
      anything. Does anybody else have experience with this? Is there a known bug (not currently known
      to me)  with a patch that I can install? I'd really like to use "SEGMENT SPACE MANAGEMENT AUTO"
      and forget about pctfree/pctused stuff. 

      --
      Mladen Gogala
      Oracle DBA 



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--

Please see the official ORACLE-L FAQ: http://www.orafaq.net
--

Author: Richard Foote
  INET: richard.foote_at_bigpond.com

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