Alternatively, you can add the password to a. It may be necessary to enable trust authentication for connections coming from localhost in pg_hba.conf for the user running the cron job. Important: Internally, pg_cron uses libpq to open a new connection to the local database. Install on Red Hat, CentOS, Fedora, Amazon Linux with PostgreSQL 11:ĬREATE EXTENSION pg_cron - optionally, grant usage to regular users: Be aware that pg_cron always uses GMT! Installing pg_cron The code in pg_cron that handles parsing and scheduling comes directly from the cron source code by Paul Vixie, hence the same options are supported. │ │ │ │ │ Saturday, or use names 7 is also Sunday)Īn easy way to create a cron schedule is:. The schedule uses the standard cron syntax, in which * means “run every time period”, and a specific number means “but only at this time”: ┌───────────── min (0 - 59) If a second run is supposed to start before the first one finishes, then the second run is queued and started as soon as the first run completes. Pg_cron can run multiple jobs in parallel, but it runs at most one instance of a job at a time. schedule ( '0 10 * * *', 'VACUUM' ) schedule. schedule ( '30 3 * * 6', $$ DELETE FROM events WHERE event_time < now () - interval '1 week' $$ ) schedule. Let me know if you have feedback, or see something I missed.- Delete old data on Saturday at 3:30am (GMT) additional reference, read with grain of salt.The redirection to /dev/null along with the additional directives averts spamming someone's email, or filing up mqueue or /var/spool/mail/elvis if the mail daemon is not functioning (or someone's email if the script goes sour, you can put in error checking in the script and send notifications if needed).The critical part is the "tue" where it runs only on a Tuesday.The 2nd Tuesday can range only from 8-14, and no lesser. It runs on only on days 8-14 where there is no possibility of a duplicate instance of running on a Tuesday, because the first Tuesday can only be a range from 1 through 7, and no greater.The proposed cron runs on the third minute.# third minute, third hour, days 2 through 15th, the four months, only on a tuesday # 3 3 8-14 jan,apr,jul,oct tue /home/elvis/scripts/some_report.bash > /dev/null 2>&1 # m h day month day of week /home/elvis/scripts/some_report.bash > /dev/null 2>&1 # these are "commented out" with the "#" character, however, these are examples day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat I believe this is correct: # For details see man 4 crontabs There are no instances of the 7th being the 2nd Tuesday obviously. On the least end, the least possible 2nd Tuesday would be the 8th. If the first of any given month begins on a Wednesday, the resulting "largest" 2nd Tuesday will be the 14th (run cal 2022 for an example). For the 2nd Tuesday, the span of possible "days" of the month the second Tuesday could land on are from day 8 through 14.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |