RE: x$ constructs and memory

[Mladen Gogala]

Title: Message

You should  have asked a grizzly bear. They're much wiser then marmots and they don't
run away that easily. Also, when you see a grizzly bear 100ft away from you and realize
that you only have a camera with you, then you begin to understand that there are bigger
worries in this world then the location of database structures.
What a grizzly would tell you is that, according to my sources,  those tables are stored
in the "misc" area of shared pool, which can easily be seen  when selected * from V$SGASTAT.
Here is what a grizzly would have in mind:
POOL        NAME                            BYTES
----------- -------------------------- ----------
shared pool 1M buffer                     2098176
shared pool KGLS heap                     4102928
shared pool PX subheap                      76920
shared pool parameters                      32796
shared pool free memory                 101833708
shared pool PL/SQL DIANA                  1028660
shared pool FileOpenBlock                 3476816
shared pool PL/SQL MPCODE                  547852
shared pool library cache                30858108
shared pool miscellaneous                11656764
shared pool pl/sql source                    2708


--
Mladen Gogala
Oracle DBA



> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On
> Behalf Of Daniel Fink
> Sent: Monday, September 29, 2003 11:10 AM
> To: Multiple recipients of list ORACLE-L
> Subject: x$ constructs and memory
>
>
> I was sitting on a mountain here in Colorado, pondering
> Oracle optimization and an interesting scenario crossed my
> feeble mind. As I began to ponder this (I asked the resident
> marmot, but he must be a SQL*Server expert...), I came up
> with several questions.
>
> Where in memory (sga or other) do the x$ constructs reside?
> Some of them are 'populated' by reading file-based structures
> (control file, datafile headers, undo segments). Does this
> information reside in memory or is it loaded each time the x$
> construct is accessed? What happens when these x$constructs
> begin to consume large amounts of memory? Is there an upper bound?
>
> Daniel Fink
>

 

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