Oracle RAC: Log directory structure in cluster ready services

When diagnosing Oracle 10g problems in cluster ready services do what Oracle support does -- examine installation log files and respective directories. Learn more in this book excerpt from "Oracle Database 10g: Real Application Clusters Handbook."

Log Directory Structure in Cluster Ready Services

To diagnose any problem, the first thing examined by Oracle Support are the installation log files. Anyone who knows anything about database administration knows the importance of the dump directories (bdump, udump, and cdump). Similarly, each component in the CRS stack has its respective directories created under the CRS home:

  • $ORA_CRS_HOME/crs/log Contains trace files for the CRS resources.
  • $ORA_CRS_HOME/crs/init Contains trace files of the CRS daemon during startup. Good place to start with any CRS login problems.
  • $ORA_CRS_HOME/css/log The Cluster Synchronization (CSS) logs indicate all actions such as reconfigurations, missed check-ins, connects, and disconnects from the client CSS listener. In some cases, the logger logs messages with the category of auth.crit for the reboots done by Oracle. This could be used for checking the exact time when the reboot occurred.
  • $ORA_CRS_HOME/css/init Contains core dumps from the Oracle Cluster Synchronization Service daemon (OCSSd) and the process ID (PID) for the CSS daemon whose death is treated as fatal. If abnormal restarts for CSS exist, the core files will have the format of core. .
  • $ORA_CRS_HOME/evm/log Log files for the Event Volume Manager (EVM) and evmlogger daemons. Not used as often for debugging as the CRS and CSS directories.
  • $ORA_CRS_HOME/evm/init PID and lock files for EVM. Core files for EVM should also be written here.
  • $ORA_CRS_HOME/srvm/log Log files for Oracle Cluster Registry (OCR), which contains the details at the Oracle cluster level.
  • $ORA_CRS_HOME//log Log files for Oracle Clusterware (known as the cluster alert log), which contains diagnostic messages at the Oracle cluster level. This is available from Oracle database 10g R2.

Use the following table of contents to navigate to chapter excerpts or click here to view RAC Troubleshooting in its entirety.

 

 


Oracle Database 10g: Real Application Clusters Handbook


  Home: Oracle RAC troubleshooting: Introduction
  1: Oracle RAC: Log directory structure in cluster ready services 
  2: Oracle RAC: Log directory structure in Oracle RDBMS
  3: Oracle RAC and the Lamport algorithm
 4: Oracle RAC: ON and OFF
  5: Oracle RAC: Database performance issues
  6: Oracle RAC: Debugging node eviction issues 
  7: Oracle RAC: Member voting
  8: Oracle RAC: Cluster reconfiguration steps
  9: Oracle RAC: Debugging CRS and GSD using DTRACING 
 

 
About the book:   
 
Oracle Database 10g: Real Applications Clusters Handbook Learn to implement Oracle real application clusters from the ground up. Maximize database availability, scalability, and efficiency. Find RAC concepts, administration, tuning, and troubleshooting information. You'll learn how to prepare and create Oracle RAC databases and servers, and automate administrative tasks. You'll also get full coverage of cutting-edge Oracle RAC diagnostic tools, backup and recovery procedures, performance tweaks and custom application design strategies. Buy this book at McGraw-Hill/Osborne
About the author:   
 
K Gopalakrishnan is a senior principal consultant with the Advanced Technology Services group at Oracle Corporation, specializing exclusively in performance tuning, high availability, and disaster recovery. He is a recognized expert in Oracle RAC and Database Internals and has used his extensive expertise in solving many vexing performance issues all across the world for telecom giants, banks, financial institutions, and universities.


 

This was first published in May 2007

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