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Diving Into the Shared Pool - An In Depth Look at Tuning the Shared Pool (Part 2)

Oracle Tips by Mike Ault

Monitoring Library and Data Dictionary Caches


Date: 11/21/98                                              Page:   1

Time: 02:51 PM             Library Caches Report            SYSTEM

                              ORTEST1 database


Library Object        Gets Get Hit%       Pins Pin Hit% Reloads Invalid

--------------- ---------- -------- ---------- -------- ------- -------

SQL AREA            46,044    99.17     99,139    99.36      24      16

TABLE/PROCEDURE      1,824    84.59      6,935    93.21       3       0

BODY                   166    93.98        171    91.23       0       0

TRIGGER                  0   100.00          0   100.00       0       0

INDEX                   27      .00         27      .00       0       0

CLUSTER                373    98.12        373    97.59       0       0

OBJECT                   0   100.00          0   100.00       0       0

PIPE                     0   100.00          0   100.00       0       0


Figure 10: Example Of The Output From Library Caches Report


The data dictionary caches used to be individually tunable through several initialization parameters, now they are internally controlled. The script in Figure 11 should be used to monitor the overall hit ratio for the data dictionary caches.



rem title:    ddcache.sql

rem FUNCTION: report on the v$rowcache table

rem HISTORY:  created sept 1995 MRA


start title80 "DD Cache Hit Ratio"

spool rep_out\&db\ddcache

SELECT (SUM(getmisses)/SUM(gets)) RATIO



spool off

pause Press enter to continue

ttitle off


Figure 11: Script to Monitor the Data Dictionary Caches

For more information on this topic, I recommend Don Burleson's latest book "Oracle Tuning: The Definitive Reference". 

You can buy it direct from the publisher for 50%-off and get instant access to the code depot of Oracle tuning scripts:


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