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RE: "SQL AREA" and "LIBARARY CACHE" size?

From: Khedr, Waleed <Waleed.Khedr_at_FMR.COM>
Date: Thu, 25 Sep 2003 06:04:40 -0800
Message-ID: <F001.005D10BD.20030925060440@fatcity.com> 





>From 9.2 doc:




Shared Pool


The shared pool portion of the SGA contains three major areas: library
cache, dictionary cache, buffers for parallel execution messages, and
control structures.
 



The total size of the shared pool is determined by the initialization
parameter SHARED_POOL_SIZE. The default value of this parameter is 8MB on
32-bit platforms and 64MB on 64-bit platforms. Increasing the value of this
parameter increases the amount of memory reserved for the shared pool.



Library Cache


The library cache includes the shared SQL areas, private SQL areas (in the
case of a multiple transaction server), PL/SQL procedures and packages, and
control structures such as locks and library cache handles.



Shared SQL areas are accessible to all users, so the library cache is
contained in the shared pool within the SGA.




Regards,



Waleed




-----Original Message-----


Sent: Thursday, September 25, 2003 7:05 AM
To: Multiple recipients of list ORACLE-L





Hi Steve,



Sorry for it, but I want to correct one thing that is ,
it is Libarray cache which is subset of SQL area which intern subset of
shared pool.




With Regards,


Manoj Kumar Jha








A transcendentalist engaged in auspicious activities does not meet with
destruction either in this world or in the spiritual world; one who does
good,


is never overcome by evil.






 


                    "Steve Adams"

                    <steve.adams_at_ixo        To:     Multiple recipients of
list ORACLE-L <ORACLE-L_at_fatcity.com>       
                    ra.com.au>              cc:

                    Sent by:                Subject:     RE: "SQL AREA" and
"LIBARARY CACHE" size?                    
                    ml-errors_at_fatcit

                    y.com

 

 

                    09/25/03 03:24

                    PM

                    Please respond

                    to ORACLE-L

 

 









Hi Manoj,



Although the stats are confused, the "SQL area" is in fact a subset of the
library cache. Cursors are cached in the library cache as namespace 0.



You can exercise limited control over the memory usage by marking objects
for keeping with DBMS_SHARED_POOL.KEEP. Otherwise, the retention of chunks
and thus the relative size of these and other shared pool areas depends
entirely how recently objects have been used, because they all share the
same LRU mechanisms (although there is an additional subordinate LRU
mechanism for the dictionary cache).


@   Regards,
@   Steve Adams
@   http://www.ixora.com.au/         - For DBAs
@   http://www.christianity.net.au/  - For all





-----Original Message-----


ManojKr Jha


Sent: Thursday, 25 September 2003 6:35 PM
To: Multiple recipients of list ORACLE-L





How the ORACLE distribute and mange the size of variouse component in
shared_pool....?


There should be some criteria on which it disribute its toatl available
memory to these component.



Steve Adams/Jonathan, do you have any about these?



Also are there any way to control the number and type  of chunks in
different buckets.


If these can be manage I hope that lots of seriouse problem related to
shared pool fragmentation and other issues can be easilly avoided?




With Regards,


Manoj Kumar Jha









A transcendentalist engaged in auspicious activities does not meet with
destruction either in this world or in the spiritual world; one who does
good,


is never overcome by evil.










                    "bhabani s pradhan"

                    <bhabaniindia_at_redif        To:     Multiple recipients
of list ORACLE-L <ORACLE-L_at_fatcity.com>
                    fmail.com>                 cc:

                    Sent by:                   Subject:     Re: "SQL AREA"
and "LIBARARY CACHE" size?
                    ml-errors_at_fatcity.c

                    om





                    09/25/03 01:04 PM

                    Please respond to

                    ORACLE-L













You cannot control the sizes of sql area and library cache
individually



Regards





On Thu, 25 Sep 2003 ManojKr Jha wrote :


>

>

>

>Hi,

>

>Any body have any idea about how to control the size of "library

>cache" and

>"sql area" in shared_pool?

>

>With Regards,

>Manoj Kumar Jha

>









>

>

>A transcendentalist engaged in auspicious activities does not

>meet with

>destruction either in this world or in the spiritual world; one

>who does

>good,

>is never overcome by evil.

>









>

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>Author: ManojKr Jha

>   INET: jmanoj_at_delhi.tcs.co.in

>

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and may contain legally privileged and confidential information belonging
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need not necessarily reflect or endorse the views of Tata Consultancy
Services on any subject matter. Any action taken or omitted to be taken
based on this message is entirely at your risk and neither the originator
of this message nor Tata Consultancy Services takes any responsibility or
liability towards the same. Opinions, conclusions and any other information
contained in this message that do not relate to the official business of
Tata Consultancy Services shall be understood as neither given nor endorsed
by Tata Consultancy Services or any affiliate of Tata Consultancy Services.
If you have received this message in error, you should destroy this message
and may please notify the sender by e-mail. Thank you.

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-- 
Author: ManojKr Jha
  INET: jmanoj_at_delhi.tcs.co.in

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Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Khedr, Waleed
  INET: Waleed.Khedr_at_FMR.COM

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Received on Thu Sep 25 2003 - 09:04:40 CDT












Original text of this message













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