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I have a procedure written in PLJava that sends out updates over JMS in my postgres database.
What I would like to do is have that function called on an interval (every 15 seconds) internally in the database (preferably not from an outside process). Is this possible? Any ideas?
If you need no external access, you are presumably able to modify the database design so that you don’t need the update at all. Can you explain more about what the update is doing?
As depesz said, you could use either cron or pgAgent, but they are only able to go down to a one minute granularity, not 15 seconds. Considering sleeping inside the stored procedure until the next iteration is not a good idea, because you will have an open transaction for all that time which is a really bad idea.