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Oracle cron crontab examples

Oracle Database Tips by Donald Burleson

With the exception of the environment setup, each line in the crontab file represents a scheduled task by using the following syntax:

field          allowed values
-----          --------------
minute         0-59
hour           0-23
day of month   1-31
month          1-12
day of week    0-7 (both 0 and 7 are Sunday)
user           Valid OS user
command        Valid command or script.


The date fields can contain a number of patterns to form complex schedules, as shown below.


*       - All available values or "first-last".

3-4     - A single range representing each possible from the
          start to the end of the range inclusive.

1,2,5,6 - A specific list of values.

1-3,5-8 - A specific list of ranges.

0-23/2  - Every other value in the specified range.


In Red Hat Linux, the month and day names can be used to specify these fields.  The following examples show a selection of possible schedules:

30 * * * * root echo "Runs at 30 minutes past the hour."
45 6 * * * root echo "Runs at 6:45 am every day."
45 18 * * * root echo "Runs at 6:45 pm every day."
00 1 * * 0 root echo "Runs at 1:00 am every Sunday."
00 1 * * 7 root echo "Runs at 1:00 am every Sunday."
00 1 * * Sun root echo "Runs at 1:00 am every Sunday."
30 8 1 * * root echo "Runs at 8:30 am on the first day of every month."
00 0-23/2 02 07 * root echo "Runs every other hour on the 2nd of July."

By default, the output from a job is electronically mailed to the owner of the job or the user specified by the mailto variable.  If this is unacceptable, the output can be redirected in a number of ways including:

# Mail the output of the job to another user.
command | mail -s "Subject: Output of job" user
# Standard output redirected to a file.
command >> file.log
# Standard output and standard error redirected to a file.
command >> logfile 2>&1
# Throw all the output away.
command >> /dev/null 2>&1

For more details, see the book Oracle Job Scheduling: Creating robust task management with dbms_job and Oracle 10g  dbms_scheduler, by Dr. Timothy Hall

If you like Oracle tuning, see the book "Oracle Tuning: The Definitive Reference". 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



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