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-00304: requested INSTANCE_NUMBER is busy tips

Oracle Error Tips by Donald Burleson


The Oracle docs note this on the ORA-00304 error:

ORA-00304: requested INSTANCE_NUMBER is busy
Cause: An instance tried to start by using a value of the initialization parameter INSTANCE_NUMBER that is already in use.
Action: Either
a) specify another INSTANCE_NUMBER,
b) shut down the running instance with this number
c) wait for instance recovery to complete on the instance with this number.

You will see ORA-00304 if an INSTANCE_NUMBER parameter value is being used at the time of initializing an Oracle instance

To resolve ORA-00304, you may try one of the three options:

  1. Use a different INSTANCE_NUMBER

-In the initialization file, modify the initialization of the INSTANCE_NUMBER

  1. Shut down the instance number causing the ORA-00304 error
  2. On the instance with the ORA-00304, allow recovery to conclude




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.