Best way of switching alertlog

In Unix
I have seen something like:
cat $AL_HOME/alert_SID.log >> $AL_HOME/logging_alert.log
rm $AL_HOME/alert_SID.log
I am not convinced this is the best way.
Wait to see other cooler ways of doing this task.
Message was edited by:
sape007
Message was edited by:
sape007

Whether you use 'rm' or 'mv', in UNIX, if the file is currently open, the inode will remain open.
This is usually not a problem. Most UNIX operating systems allow for multiple inodes to be open. And the next time the Oracle database is shutdown, the inode will be closed. And usually, most UNIX systems have a planned periodic reboot anyway, so it's not a worry.
However, if you want to prevent holding inodes open, then instead of 'mv' or 'rm' just clear the alert log by nulling out the file:
cat /dev/null>alert_sid.log
And if you want a copy of the file for posterity, copy (cp) it first before you null it out.
This usually is more of a concern with the listener log, because it is held open all the time by the listener process. The alert log is actually closed and opened only when a process needs to write to it.

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Attachments:
GrabWhileLoop.png ‏34 KB
MainWhileLoop.png ‏68 KB

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In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
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