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Don Burleson Blog 







Monitor Oracle archived redo log directory  

Oracle Database Tips by Donald BurlesonApril 14, 2016

Question:  What do I do to monitor my archived redo log directory to keep it from getting full and locking up my database?  Is there a script to monitor my alert log directory?
Answer:  You can easily monitor your archived redo log directory to send an alert when it reaches 90% full.  The solution fix is to delete the oldest archived redo log files, or move them into another mount point.  Low free space in the archived redo log directory requires a special procedure.  If the archived redo log directory becomes full, your Oracle database will hang up. This procedure send a text message alert to the DBA’s phone and allows the Oracle Remote DBA to add space (or move old redo logs) before the database hangs.
Here is an example of a UNIX script for keeping the archived redo log directory free of elderly files.  As we know, it is important to keep room in this directory, because Oracle may “lock-up” if it cannot write a current redo log to the archived redo log filesystem. This script could be used in coordination with Oracle Recovery Manager (rman) to only remove files after a full backup has been taken.  This can be scheduled to run using a crontab (cron) task:

 # Cleanup archive redo logs that are more than 7 days old
 find /u01/app/oracle/admin/mysid/arch/arch_mysid*.arc -ctime +7 -exec rm {} ;

As we see, it is very easy to clean-out the redo log directory, and you can monitor the spaced used in the archived redo log directory with the df –k UNIX/Linux command.  You can also monitor the archived redo log directory status with Oracle Enterprise Manager (OEM).

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