Oracle Training Oracle Support Development Oracle Apps

 E-mail Us
 Oracle Articles
New Oracle Articles

 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog

 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Oracle Support

 SQL Tuning

 Oracle UNIX
 Oracle Linux
 Remote s
 Remote plans
 Application Server

 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S


 Consulting Staff
 Consulting Prices
 Help Wanted!


 Oracle Posters
 Oracle Books

 Oracle Scripts

Don Burleson Blog 







Oracle Business Intelligence, OLAP and BI training and consulting tips . . .

Click here for more
Oracle News Headlines


How Do You Identify 'Bad SQL'?

May 12, 2004
Mark Rittman

Before you can identify problem SQL in your database, you have to ask the question of what is bad SQL? What criteria do you use when you begin the hunt for problem SQL in your critical systems? Understand that even the seasoned experts disagree on what constitutes efficient and inefficient SQL; so there’s no way to sufficiently answer this question to every Oracle professional’s satisfaction. What follows are some general criteria you can use when evaluating the output from various database monitors or personal diagnostic scripts"

writes Don Burleson in this SQL tuning article.

The following script will find all current “slow” SQL statements with a high execution time. 

You pass the minimum execution time as the exec_time argument:  

    max(tm) tm,
    (sysdate-sql_exec_start) * 3600*24 ela_tm
       ( ( Cast(sample_time AS DATE) ) -
             ( Cast(sql_exec_start AS DATE) ) ) * ( 3600 * 24 ) tm
see code depot for full script       
order by



Oracle Training at Sea
oracle dba poster

Follow us on Twitter 
Oracle performance tuning software 
Oracle Linux poster


Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

and include the URL for the page.


Burleson Consulting

The Oracle of Database Support

Oracle Performance Tuning

Remote DBA Services


Copyright © 1996 -  2017

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.

Remote Emergency Support provided by Conversational