BC remote Oracle DBA - Call (800) 766-1884  
Oracle Consulting Oracle Training Development

Remote DBA

Remote DBA Plans  

Remote DBA Service

Remote DBA RAC

   
Remote DBA Oracle Home
Remote DBA Oracle Training
Remote DBA SQL Tuning Consulting
Remote DBA Oracle Tuning Consulting
Remote DBA Data Warehouse Consulting
Remote DBA Oracle Project Management
Remote DBA Oracle Security Assessment
Remote DBA Unix Consulting
Burleson Books
Burleson Articles
Burleson Web Courses
Burleson Qualifications
Oracle Links
Remote DBA Oracle Monitoring
Remote DBA Support Benefits
Remote DBA Plans & Prices
Our Automation Strategy
What We Monitor
Oracle Apps Support
Print Our Brochure
Contact Us (e-mail)
Oracle Job Opportunities
Oracle Consulting Prices





   

 

 

 

Remote DBA services

Remote DBA Support

Remote DBA RAC

Remote DBA Reasons

Remote Oracle Tuning

Remote DBA Links

Oracle DBA Support

Oracle DBA Forum

Oracle Disaster

Oracle Training

Oracle Tuning

Oracle Training

 Remote DBA SQL Server

Remote MSSQL Consulting

Oracle DBA Hosting

Oracle License Negotiation

 

 


 

 

 

 

 
 

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

Oracle Tips by Mike Ault

A Matter Of Hashing
 

A quick glance at the report in Figure 5 shows that I need to look at the DCARS user to correct  hashing problems they might be having and improve the reuse of SQL in the shared pool. However, look at the number of hash areas this user has accumulated, 6,484, if I run the report from figure 7 in last months article it will out weigh the paper version of the Oracle documentation set. A faster way to find the hash values would be to do a self join and filter out the hash values that are duplicate. Sounds easy enough, but remember, the V$ tables have no rowids so you can’t use the classic methods, you have to find another column that will be different when the HASH_VALUE column in V$SQLAREA is the same. Look at the select in Figure 6.

 

select distinct a.hash_value from v$sqlarea a, v$sqlarea b, Remote DBA_users c

SEE CODE DEPOT FOR FULL SCRIPT

and c.username='DCARS' and  ß change to user you are concerned about

a.FIRST_LOAD_TIME != b.FIRST_LOAD_TIME

 

Figure 6: Example Select To Determine Duplicate Hash Values

 

Figure 7 has an example output from the above select.
 


If you like Oracle tuning, you may enjoy the book Oracle Tuning: The Definitive Reference , with over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it directly from the publisher and save 30%, and get instant access to the code depot of Oracle tuning scripts.
 


Expert Remote DBA

BC is America's oldest and largest Remote DBA Oracle support provider.  Get real Remote DBA experts, call
BC Remote DBA today.

 

 

Remote DBA Service
 

Oracle Tuning Book

 

Advance SQL Tuning Book 

BC Oracle support

Oracle books by Rampant

Oracle monitoring software

 

 

 

 

 

 

BC Remote Oracle Support

Remote DBA

Remote DBA Services

Copyright © 1996 -  2013 by Burleson. All rights reserved.

Oracle® is the registered trademark of Oracle Corporation.



Hit Counter