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 


 

 

 


 

 

 
 


Multiple alert logs in RAC

Oracle Database Tips by Donald BurlesonJuly 29, 2015

Question:  Is it one alert log per instance or one per RAC database?  I want to monitor by RAC alerts and I need to know if Oracle has multiple alerts logs in RAC databases.  Are alert logs in the diagnostic_dest instance specific or database specific?  If they are instance specific, how can you consolidate the alert log messages?

Answer:  Yes, each instance in a RAC cluster has it's own alert log.  The 11g RAC Administrator's Guide under Appendix B Troubleshooting notes:

Using Instance-Specific Alert Files in Oracle RAC

Each instance in an Oracle RAC database has one alert file. The alert file for each instance, alert.SID.log, contains important information about error messages and exceptions that occur during database operations. Information is appended to the alert file each time you start the instance. All process threads can write to the alert file for the instance.

The alert_SID.log file is in the directory specified by the DIAGNOSTIC_DEST parameter in the initdb_name.ora initialization parameter file.

For monitoring you alert logs, I use scripts to scan each alert log in the RAC cluster for important messages and e-mail them to a separate location.  If you don't want to write your own custom scripts, see my Oracle script download.

  • In 11g and beyond, you can directly query the alert log with SQL, using x$dbgalertext.

  • SQL against the alert log - You can define the alert log file as an external table and detect important messages with SQL and e-mail them to a central repository.

  • Scripts - You can write Oracle shell scripts OS shell scripts to detect alert log messages. 

  • Ion - The Ion tool has complete mechanisms for setting custom alert log extracts.

  • PL/SQL - You can write a SQL*Plus procedure using utl_file to read the alert log.

 
   
Oracle Grid and Real Application Clusters

See working examples of Oracle Grid and RAC in the book Oracle Grid and Real Application Clusters.

Order directly from Rampant and save 30%. 
 

 
Get the Complete
Oracle SQL Tuning Information 

The landmark book "Advanced Oracle SQL Tuning  The Definitive Reference"  is filled with valuable information on Oracle SQL Tuning. This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30% off directly from the publisher.


 

 

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.

 

 

��  
 
 
Oracle Training at Sea
 
 
 
 
oracle dba poster
 

 
Follow us on Twitter 
 
Oracle performance tuning software 
 
Oracle Linux poster