RE: Which packages to pin
- From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
- To: <peter.schauss@xxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 13 Jul 2005 11:01:29 -0700
Peter, here is a script you might want to try. I got this from somewhere else
(maybe metalink?, I think Steve has a similar/better one on ixora too):
set echo off
spool pool_est
/*
*********************************************************
* *
* TITLE : Shared Pool Estimation *
* CATEGORY : Information, Utility *
* SUBJECT AREA : Shared Pool *
* DESCRIPTION : Estimates shared pool utilization *
* based on current database usage. This should be *
* run during peak operation, after all stored *
* objects i.e. packages, views have been loaded. *
* *
* *
********************************************************/
Rem If running MTS uncomment the mts calculation and output
Rem commands.
set serveroutput on;
declare
object_mem number;
shared_sql number;
cursor_mem number;
mts_mem number;
used_pool_size number;
free_mem number;
pool_size varchar2(512); -- same as V$PARAMETER.VALUE
begin
-- Stored objects (packages, views)
select sum(sharable_mem) into object_mem from v$db_object_cache;
-- Shared SQL -- need to have additional memory if dynamic SQL used
select sum(sharable_mem) into shared_sql from v$sqlarea;
-- User Cursor Usage -- run this during peak usage.
-- assumes 250 bytes per open cursor, for each concurrent user.
select sum(250*users_opening) into cursor_mem from v$sqlarea;
-- For a test system -- get usage for one user, multiply by # users
-- select (250 * value) bytes_per_user
-- from v$sesstat s, v$statname n
-- where s.statistic# = n.statistic#
-- and n.name = 'opened cursors current'
-- and s.sid = 25; -- where 25 is the sid of the process
-- MTS memory needed to hold session information for shared server users
-- This query computes a total for all currently logged on users (run
-- during peak period). Alternatively calculate for a single user and
-- multiply by # users.
select sum(value) into mts_mem from v$sesstat s, v$statname n
where s.statistic#=n.statistic#
and n.name='session uga memory max';
-- Free (unused) memory in the SGA: gives an indication of how much memory
-- is being wasted out of the total allocated.
select bytes into free_mem from v$sgastat
where name = 'free memory';
-- For non-MTS add up object, shared sql, cursors and 20% overhead.
used_pool_size := round(1.2*(object_mem+shared_sql+cursor_mem));
-- For MTS mts contribution needs to be included (comment out previous line)
-- used_pool_size := round(1.2*(object_mem+shared_sql+cursor_mem+mts_mem));
select value into pool_size from v$parameter where name='shared_pool_size';
-- Display results
dbms_output.put_line ('Obj mem: '||to_char (object_mem) || ' bytes');
dbms_output.put_line ('Shared sql: '||to_char (shared_sql) || ' bytes');
dbms_output.put_line ('Cursors: '||to_char (cursor_mem) || ' bytes');
-- dbms_output.put_line ('MTS session: '||to_char (mts_mem) || ' bytes');
dbms_output.put_line ('Free memory: '||to_char (free_mem) || ' bytes ' || '('
|| to_char(round(free_mem/1024/1024,2)) || 'MB)');
dbms_output.put_line ('Shared pool utilization (total): '||
to_char(used_pool_size) || ' bytes ' || '(' ||
to_char(round(used_pool_size/1024/1024,2)) || 'MB)');
dbms_output.put_line ('Shared pool allocation (actual): '|| pool_size ||'
bytes ' || '(' || to_char(round(pool_size/1024/1024,2)) || 'MB)');
dbms_output.put_line ('Percentage Utilized: '||to_char
(round(used_pool_size/pool_size*100)) || '%');
end;
/
spool off
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Schauss, Peter
Sent: Wednesday, July 13, 2005 10:45 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: Which packages to pin
Oracle 8.1.7.4 - Aix 5.2.
As a cure for the ORA-4031 errors which we are getting (up to 5 per
day), I am looking at the possibility of pinning some of my stored
procedures and triggers. Looking at the Toad Pinned Code screen
combined with what I know about the application gives me a good idea of
what parts of the application code should be pinned, but I do have some
questions:
1. Are triggers normally candidates for pinning? (Toad lists them on
its screen, so I infer that they are.)
2. Should I also pin some of the system packages which are displayed on
the Toad Pinned Code screen? (e.g. DBMS_OUTPUT, STANDARD,
DBMS_STANDARD, DBMS_SQL...)
3. Which of the dynamic views (V$... ) lists the packages, stored
procedures, and triggers currently in the shared pool?
Thanks,
Peter Schauss
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