Autoallocate (was Re: LMT monitoring)

From: Alex Feinstein <alexf1_at_san.rr.com>
Date: Sun, 16 Mar 2003 20:58:46 -0800
Message-ID: <F001.0056B5FC.20030316205846@fatcity.com>

How about UNDO tablespace in 9.2?
It gets created with "autoallocate", and there is no way to change it or specify any parameters for undo segments. Each segment extended as needed, and when shrinked deallocated some extents not necessary the last, than allocate new extent.

Alex.

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Wednesday, March 12, 2003 2:22 PM

You do get odd results. The last time I tested on a clean tablespace, an initial of 65MB gave me a consistent result which I recall as:

    Extent 0             at 8MB
    Extents 1 - 56     at 1MB each
    Extent 57            at 8MB

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Tuesday, March 11, 2003 6:23 AM

   case

     when initial_extent < 1m then
       case when extents < 16 then next = 64k,
            when extents < 80 then next = 1m,
            when extents < 200 then next = 8m,
            else next = 64m
     when initial_extent >= 1m then
       case when extents < 64 then next = 1m,
            when extents < 184 then next = 8m,
            else next = 64m )

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Author: Alex Feinstein
  INET: alexf1_at_san.rr.com

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