如何在不关闭监听的情况下move 或 purge listener.log

How to rotate or backup or rename listener.log or purge listener log data to avoid large listener.log file? (Doc ID 1457196.1)

1) Stop the listener on a regular basis then you can simply rename the file at the OS level, then on next listener startup, a new one will be 
created.

OR

2) If you have a 24X7 environment and the listener can not be stopped, then you can use the following steps to rename / move the file 
without having to restart it:

LSNRCTL>
LSNRCTL> set current_listener 
<listenername>
LSNRCTL> set log_status off

In another window 
rename the log file. Then return to previous window

LSNRCTL> set log_status on

which will create a new and empty listener.log file which will continue 
logging.

OR

3) Follow the below Note 135063.1

Note 135063.1   How To Change the Listener Log Filename Without Stopping the 
Listener