Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 
 Home
 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
 Analysis
 Design
 Implementation
 Oracle Support


 SQL Tuning
 Security

 Oracle UNIX
 Oracle Linux
 Monitoring
 Remote s
upport
 Remote plans
 Remote
services
 Application Server

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

 Remote S
upport  
 Development  

 Implementation


 Consulting Staff
 Consulting Prices
 Help Wanted!

 


 Oracle Posters
 Oracle Books

 Oracle Scripts
 Ion
 Excel-DB  

Don Burleson Blog 


 

 

 


 

 

 
 

max_string_size tips

Oracle Database Tips by Donald BurlesonJune 25, 2015

 

Question:  What does the max_string_size parameter do in Oracle 12c?

Answer:  In order to expand the maximum value of varchar2 (also nvarchar2 and raw) datatypes in Oracle 12c and beyond, the max_string_size parameter needs to be set to "extended".  This will change the maximum value from 4k (4096) to 32k (32767).

Oracle will now support varchar2(32767) and raw (32767) and nvarchar2(32767) (up from varchar2(4000). 

Less than 4K is stored inline in the data blocks, and more than 4K row lengths are stored out of line (BFILE)

To change max_string_size from the default of "standard" to "extended" you must bounce the database for the parameter to take effect and then run a utility to change all of the old maximum sizes for VARCHAR2 to the new larger values.

WARNING:  You MUST run utl32k.sql immediately after changing max_string_size=extended, else you risk invalidating the database columns.

1. Start Oracle in UPGRADE mode
3. Connect AS SYSDBA
4. Change the setting of MAX_STRING_SIZE to EXTENDED
5. Run $OH/rdbms/admin/utl32k.sql
6. Open the Oracle database.

 

 

 

 

   
Oracle Training from Don Burleson 

The best on site "Oracle training classes" are just a phone call away! You can get personalized Oracle training by Donald Burleson, right at your shop!

Oracle training
 
 


 

 

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 -  2016

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.


 

��  
 
 
Oracle Training at Sea
 
 
 
 
oracle dba poster
 

 
Follow us on Twitter 
 
Oracle performance tuning software 
 
Oracle Linux poster