Basically,on that stuff,I have no safety at all,until the property was settle down.They cannot be trusted.
sometimes,after long time running of database,the listener log became large and inconvenient to locate the error msg in large text file, so it’s necessary to archive the listener log. follow the step.
on win platform:
lsnrctl set log_status off // to stop log msg to listener log file
rename the listener.log
lsnrctl set log_status on// to start the log msg to listener.log
on unix or linux platform:
echo “123” > listener.log