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Re: How to run a task continuously in the background

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We used a trigger that called pg_notify (https://www.postgresql.org/docs/9.5/sql-notify.html​) and then had another

process that LISTENed for notifications.


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Gerard Weatherby| Application Architect
NMRbox | Department of Molecular Biology and Biophysics | UConn Health
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From: Dirk Mika <Dirk.Mika@xxxxxxxxxxxxx>
Sent: Tuesday, July 16, 2019 1:32 AM
To: pgsql-general@xxxxxxxxxxxxxxxxxxxx
Subject: Re: How to run a task continuously in the background
 

Creating a background worker that invokes a stored procedure once per

But this is not so simple to put in place.

 

It's not really important that the job runs once a second, but that it starts immediately when I want it to.

If I start a job with pg_cron, it will not be executed until the next full minute at the earliest.

 

Otherwise pg_cron with a function that performs a pg_sleep of one

second in a loop.

 

Anyway, it seems to me you are better refactoring your solution: it

seems you need to process data when _new data_ comes, not once per

second, so it sounds to me like a trigger could solve the problem.

 

The processing of the data via a job is deliberately chosen so as to separate the insertion of the data from their processing.

If a trigger were to do this, the transaction in which the data is inserted would take longer. This is not intended.

It is common for many records to be inserted in a short time, but processing takes a little time. The application that inserts the data should however not be slowed down.

 

Dirk

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Dirk Mika
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