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

Rotating OC4J Server Logs#

This logfile 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 The time at which the log file will be rotated each day.

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

opmn.xml

<process-type id="cronos" ...
   <data id="java-options" value="-server -Xmx512m   -Dstdstream.filesize=1  -Dstdstream.filenumber=10
           -Djava.security.policy=$ORACLE_HOME/j2ee/cronos/config/java2.policy -Djava.awt.headless=true
           -Dhttp.webdir.enable=false"/>
   <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.
• The original log file was in \opmn\logs\OC4J~cronos~default_group~1
• New log here: \opmn\logs\cronos_default_group_1\OC4J_2008_02_28_09_51_20.log
• If no directories are specified in the oc4j-options the new logs will be in \j2ee\home\cronos_default_group_1\