The OC4J log file (contained on your application server) is the log file that the application writes all its error messages to.

Rotating OC4J Server Logs#

This log file can grow to quite a size and you may find it useful to "rotate" the files so that they don't get to large, and can be accessed, backed up , et cetera.

The OC4J server log can be rotated based on the size of the log file in megabytes, or the log file can be rotated daily at a certain hour. However, the file names of the logs and the paths are different than the current configuration. The opmn.xml file must be edited using the following parameters:

stdstream.filesize=max_file_size

The maximum size any file in the archive will be allowed to grow to, in megabytes. Files are rotated when this maximum is reached.

stdstream.filenumber=max_files

The maximum number of files to keep as archives. The oldest file will be automatically deleted when the limit is exceeded.

stdstream.rotatetime=HH

mm'}:

Example: The instance is called 'Prod'. All paths are relative to <ORACLE_HOME>.

opmn.xml

<process-type id="Prod" ...
   <data id="java-options" value="-server -Dstdstream.filesize=1 -Dstdstream.filenumber=10 -Dstdstream.rotatetime=06:00 -Djava.security.policy=$ORACLE_HOME/j2ee/Prod/config/java2.policy -Djava.awt.headless=true -Dhttp.webdir.enable=false -XX:MaxPermSize=128M -Xmx4G -XX:AppendRatio=3"/>
   <data id="oc4j-options" value="-out ..\..\opmn\logs\OC4J.log -err   ..\..\opmn\logs\OC4J.log"/> 

• This will create up to 10 log files, each with a size of 1MB. It will also rotate at 6am each morning no matter what the size is.
• The original log file was in \opmn\logs\OC4J~Prod~default_group~1
• New log here: \opmn\logs\Prod_default_group_1\OC4J_2010_02_28_09_51_20.log
• If no directories are specified in the oc4j-options the new logs will be in \j2ee\home\Prod_default_group_1\