With all due respect, I don't believe that it is a fixed area.
You can create X$ tables by running certain catalog scripts. I believe
that the description of X$ tables is located logically close to the
description of the data dictionary, which would mean shared pool, not
the fixed one. Now, can we get back to bears?
--
Mladen Gogala
Oracle DBA
> -----Original Message-----
> From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com] On
> Behalf Of Tanel Poder
> Sent: Monday, September 29, 2003 1:45 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: x$ constructs and memory
>
>
> > What I have not checked so far is how an ALTER SYSTEM
> increasing a
> parameter affects the SGA. In practice it's a realloc()
> (functionally speaking). It would seem reasonable to me to
> have a shared memory segment to hold all parameters which can
> by dynamically changed. I wouldn't touch it if parameters are
> decreased, but I would have to realloc it in case of a
> massive increase. Hmm, I guess that I would allow some spare
> memory initially, performance penalty would otherwise be
> severe. Which all makes the 10g dynamic rearrangement quite
> sensible ...
>
> Hi!
>
> I think the behaviour depends on which parameter you are
> changing. If you're changing shared_pool_size to higher size,
> then just additional extents of memory are allocated and heap
> header is updated. If you set sort_area_size higher, nothing
> particular happens, except some maximum is increased in UGA I
> believe and during next sort you can go up to that limit.
> Some parameters like enqueue_resources can't be changed in
> the fly, because they are fixed, they stay in fixed area of
> SGA, fixed area isn't managed as heap as I understand, it
> does not have any free or LRU lists, because it's physical
> structure remains unchanged during the lifetime of an instance.
>
> Tanel.
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Tanel Poder
> INET: tanel.poder.003_at_mail.ee
>
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Author: Mladen Gogala
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Received on Mon Sep 29 2003 - 13:24:46 CDT
