Listener Log: Manage the size of this log file to save time and trouble!

Add the maintenance of the listener log size (text, not XML) to the list of  your routine DBA tasks.

The XML formatted listener logs are conveniently rolled over at 10MB.  Unfortunately, the text file logs
grow (and grow) until they can cause serious issues.  Furthermore, when troubleshooting
a listener problem, uploading these logs to support can become virtually impossible.

Determine the location of the text or flat file logs by issuing lsnrctl status:

LSNRCTL>status <your listener name>

You'll see the XML log location in the status output similar to this:

$ORACLE_BASE/diag/tnslsnr/<your_host>/<listener_name>/alert/*.xml