Call now: 252-767-6166  
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 









ORA-00904: "DROP_SEGMENTS": invalid identifier

Oracle Database Tips by Donald Burleson


I try to truncate a table and I get this:

ORA-00904: "DROP_SEGMENTS": invalid identifier

Can anybody suggest what the problem is and what I should do?

Answer: by ăг∂ή

Cause: The post installation scripts were not run properly,so drop_segments column is missing from sys.mon_mods$ . One or more of these post installation scripts would add the new column to the database and if the script is not run properly, it will cause an ORA-904 in the application later on.

Fix: Connect to the SQL session as SYS and issue the following:
SQL> desc sys.mon_mods$

If the drop_segments is missing then we are getting ORA-904.If this is the case,we can do one of these:

1.Shutdown the database- startup migrate and then run catpatch.sql and catalog.sql(the scripts that are needed to be run as a post-installarion process).

2.Add the drop_segments column using:
SQL> alter table sys.mon_mods$ add ( drop_segments number default 0 );

Then run $ORACLE_HOME/rdbms/admin/catalog.sql again.



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 -  2020

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.