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Don Burleson Blog 








Top Oracle shared pool scripts

Oracle Database Tips by Donald Burleson

The Oracle shared pool has very few tuning knobs other than adjusting the shared_pool_size, setting cursor_sharing and tuning the SQL that reside within the library cache of the shared pool.

A shortage of shared pool RAM may result in high library cache reloads, high row cache reloads, and shared pool latch contention. You may also see the error: "ORA-04031: Out of shared pool memory".

Also see Oracle shared pool latch internals.

Oracle shared pool scripts

Here are some common shared pool scripts for monitoring the shared pool.  For a complete set of shared pool scripts, see my book "Oracle Tuning: The Definitive Reference", with 950 pages of tuning tips and scripts. 

select *
      name, bytes/(1024*1024) MB
      pool ='shared pool'
   order by
      bytes desc
where rownum < 20;

We also need scripts to monitor for non-reentrant SQL (SQL without bind variables, which can be corrected by setting cursor_sharing=force). This shared pool script will identify SQL where "executions=1", indicating nonreentrant SQL:

   count(1) num_sql,
   sum(decode(executions, 1, 1, 0)) one_use_sql,
   sum(sharable_mem)/1024/1024      meg_used,
      executions,   1,
      sharable_mem, 0)
   )/1024/1024                      mb_per
   sharable_mem > 0;

This shared pool script will display shared pool data from STATSPACK:

set lines 80; 
set pages 999; 
column mydate heading 'Yr.  Mo Dy  Hr.' format a16 
column c1 heading "execs"    format 9,999,999 
column c2 heading "Cache Misses|While Executing"    format 9,999,999 
column c3 heading "Library Cache|Miss Ratio"     format 999.99999 
break on mydate skip 2; 
   to_char(snap_time,'yyyy-mm-dd HH24')  mydate, 
   sum(new.pins-old.pins)               c1, 
   sum(new.reloads-old.reloads)          c2, 
   sum(new.pins-old.pins)                library_cache_miss_ratio 
   stats$librarycache old, 
   stats$librarycache new, 
   stats$snapshot     sn 
see code depot for full scripts
   new.snap_id = sn.snap_id 
   old.snap_id = new.snap_id-1 
   old.namespace = new.namespace 
group by 
   to_char(snap_time,'yyyy-mm-dd HH24') 

This shared pool script will use the automatic workload repository (AWR) for a time-series look at the shared pool:

column enqueue_deadlocks format 999,999,999

   to_char(sn.end_interval_time,'dd Mon HH24:mi:ss') mydate,
   a.value enqueue_deadlocks
   dba_hist_sysstat a,
   dba_hist_snapshot sn
see code depot for full scripts
   sn.snap_id = (select max(snap_id) from dba_hist_snapshot)
   and a.snap_id = sn.snap_id
   and a.stat_name = 'enqueue deadlocks'

Get the Complete
Oracle SQL Tuning Information 

The landmark book "Advanced Oracle SQL Tuning  The Definitive Reference"  is filled with valuable information on Oracle SQL Tuning. This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30% off directly from the publisher.



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