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 









Oracle cursor_sharing=similar tips

Oracle Database Tips by Donald Burleson

Question:  I just turned-on cursor_sharing=similar in Oracle 9i and now some of my large SQL statements get the error:

ORA-03113 no more data to read from the socket

When I remove cursor_sharing=similar, it works fine.

Answer:  First, note that Oracle9i was de-supported in 2015, and you may want to upgrade.  There are many possible causes for the ORA-03113 error.  See MOSC Note:17613.1 "ORA-03113":

Some Oracle databases with high ad-hoc query activity (Crystal Reports, Business Objects) cannot avoid in-line literals inside the SQL, and that's why Oracle introduced the cursor_sharing parameter. This use of cursor_sharing=similar allows for bind variable "peeking", and in my opinion, it's too buggy to use until Oracle 11i, when you get adaptive cursor sharing.  See here for details:

The dynamic shop often has SQL that is generated by ad-hoc query tools with hard-coded literal values embedded within the SQL and the library cache is clogged with non-reentrant SQL (you can tell because the SQL has literals in the WHERE clause and it always has executions=1).

As we know, hard-coded literal values make the SQL statements non-reusable unless cursor_sharing=force is set in the Oracle initialization file.

Note:  The cursor_sharing=similar option has been deprecated in Oracle 11g and will be removed in version 12 per MOSC Note 1169017.1

Note:  For testing purposes, you may want to turn-off optimizer bind variable peeking and this can be done in several ways::

  • Re-set the _optim_peek_user_binds hidden parameter.

  • Re-analyze using dbms_stats with the argument:  method_opt=> 'for all columns size 1';

My other tips for using cursor_sharing include:



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.