Axibase Time Series Database

Scheduling

Forecasts, SQL queries, data export jobs, and administrative tasks can be run on schedule according to a cron expression. The schedules are listed on the Settings > Server Properties page.

Syntax

Fields in a cron expression have the following order:

  • seconds
  • minutes
  • hours
  • day-of-month
  • month
  • day-of-week

For example, 0 0 8 * * ? means that the task is executed at 08:00:00 every day.

seconds minutes hours day-of-month month day-of-week
   0       0      8        *         *        ?

Either 0 or 7 can be used for Sunday in the day-of-week field.

Field Control Symbols:

Name Description
* Any value
? No specific value
, Value list separator
- Range of values
/ Step values

For example, 0 0 8 * * ? executes at 08:00:00 every day.

Field Constraints:

Name Allowed Values
second 0-59
minute 0-59
hour 0-23
day-of-month 1-31, ?
month 1-12 or JAN-DEC
day-of-week 1-7 or MON-SUN, ?
  • If a value is set in day-of-week, day-of-month must be set to ?. For example 0 0 6 ? * MON.
  • If a value is set in day-of-month, day-of-week must be set to ?. For example 0 0 6 */2 * ?.

Time Zone

The cron expression is evaluated based on the time zone of the server where the database is running.

The time zone is displayed on the Settings > System Information page.

Examples

Expression Second Minute Hour Day of Month Month Day of Week Description
0 0/15 * * * ? 0 0/15 * * * ? Every 15 minutes.
0 5 4 * * ? 0 5 4 * * ? At 04:05 every day.
0/10 * * * * ? 0/10 * * * * ? Every ten seconds.
0 0/1 * * * ? 0 0/1 * * * ? Every minute.
0 0 0 * * ? 0 0 0 * * ? Every day at 00:00.
0 5,35 * * * ? 0 5,35 * * * ? Every hour at the fifth and thirty-fifth minute.
0 0 6 ? * MON 0 0 6 ? * MON Every Monday at 06:00.
0 5 0 * 8 ? 0 5 0 * 8 ? At 00:05 every day in August.
30 15 14 1 * ? 30 15 14 1 * ? At 14:15:30 on the first of every month.
0 0 22 ? * 1-5 0 0 22 ? * 1-5 At 22:00 on Mon, Tue, Wed, Thu and Fri.
0 5 0-10/2 * * ? 0 5 0-10/2 * * ? At every ninth minute past the zero, second, fourth, sixth, eighth, and 10th hour.
0 0 0,12 1 */2 ? 0 0 0,12 1 */2 ? At 00:00 and 12:00 on the first in
January, March, May, July, September and November.