Is there really any considerable overhead involved in dynamically
allocating an extent? By creating free space chunks in a tablespace
of uniform extent size, will you really reduce the amount of time and
resources spent when a segment allocates those extents?
I doubt it, but statistics from v$sesstat could convince me otherwise.
--
Jeremiah Wilton
http://www.speakeasy.net/~jwilton
On Sun, 22 Jul 2001, Don Granaman wrote:
> If you are using uniform extents in LMT, you don't want to coalesce
> - ever. Since every extent will be the same size, it is useless
> overhead. This is even more true if you have adopted a "uniform
> extents" policy in any dictionary managed tablespaces. In fact, to
> reduce the overhead of throwing a new extent in the latter, you
> might try "pre-fragmenting" the tablespace by creating a junk table
> in it and manually allocating new extents, then dropping the table -
> during a low activity period of course.
--
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--
Author: Jeremiah Wilton
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