RE: ** keep/pin objects in sga
- From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxxxxx>
- To: <ajoshi977@xxxxxxxxx>, <eagle.f@xxxxxxxxx>
- Date: Mon, 23 Oct 2006 15:59:17 -0400
None of the X$ tables are documented by Oracle.
Briefly:
X$KGHLU - Statistics about shared pool LRU lists
X$KSMSP - Listing of chunks in the shared pool
X$KSMSS - Map of SGA memory chunks. Basis for V$SGASTAT view.
Hope that helps,
-Mark
--
Mark J. Bobak
Senior Oracle Architect
ProQuest Information & Learning
There is nothing so useless as doing efficiently that which shouldn't be
done at all. -Peter F. Drucker, 1909-2005
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of A Joshi
Sent: Monday, October 23, 2006 3:37 PM
To: eagle.f@xxxxxxxxx
Cc: fuadar@xxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: Re: ** keep/pin objects in sga
Eagle fan,
Thanks. I tried to look up the REFERENCE manual for 9i but could not
find explanation for x$ views : x$kghlu, x$ksmss, x$ksmsp
I did find v$ views listed. Can you tell where I can find the
explanation. Thanks
About cursor_space_for_time : My current shared pool is 600MB. If I set
cursor_space_for_time to true then I assume I will need to increase the
shared pool. Any way I can compute or guess how much I need to increase.
Thanks
Go eagles.
eagle fan <eagle.f@xxxxxxxxx> wrote:
hi:
If you have literal sql issue, I suggest you use bind variables
rather than cusor_sharing.
The parameter cursor_space_for_time is used to pin shared sql in
shared_pool. You can find more info about this parameter..
For advance warning, you can check the x$ tables: x$kghlu,
x$ksmss, x$ksmsp
On 10/22/06, A Joshi <ajoshi977@xxxxxxxxx > wrote:
Fuad,
Thanks. So no short cut there. OK. So I guess we
still need to do keeping of objects and sql. And put in bind variables.
I assume there is some improvement in 9i in handling all this. Is there
anything else that can be done to improve the sga usage and avoid its
fragmentation and is there way to get advance warning when it is
fragmented and could be heading for problems. Thanks
Fuad Arshad <fuadar@xxxxxxxxx> wrote:
cursor sharing still has a lot of bugs.
it depends on the environment but tom kyte also
asked for the use of this only at session level rather than system level
----- Original Message ----
From: A Joshi <ajoshi977@xxxxxxxxx>
To: oracle-l@xxxxxxxxxxxxx
Sent: Friday, October 20, 2006 3:20:15 PM
Subject: ** keep/pin objects in sga
Hi,
For efficient use of shared pool and SGA : On
9i : I assume it is beneficial to keep objects and sql in sga. Or is it
not needed on 9i? I think parameter CURSOR SHARING can be set to FORCE
as alternative to using bind variables and that will help SGA use but
there were issues with it. I assume in 9i it is better. Any body with
experience otherwise or any other catch? Thanks for your help.
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Eagle Fan
Oracle DBA
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