kandi X-RAY | pg_cron Summary
kandi X-RAY | pg_cron Summary
pg_cron is a simple cron-based job scheduler for PostgreSQL (9.5 or higher) that runs inside the database as an extension. It uses the same syntax as regular cron, but it allows you to schedule PostgreSQL commands directly from the database:. pg_cron can run multiple jobs in parallel, but it runs at most one instance of a job at a time. 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.
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pg_cron Key Features
pg_cron Examples and Code Snippets
Trending Discussions on pg_cron
I am trying to install pg-cron extension for Azure PostgreSQL Flexible server. According to documentation found here: https://docs.microsoft.com/en-us/azure/postgresql/flexible-server/concepts-extensions#postgres-13-extensions pg_cron is available extension, but when I am trying to install it:...
ANSWERAnswered 2021-Dec-16 at 14:12
Seems that the pg_cron extension is already enabled, by default, in the default 'postgres' database. The reason why I was not seeing this is because I am not using the default 'postgres' database. I have created my own DB which I was connected to. This actually does not resolve my problem, because I can't execute jobs from pg_cron across databases...
We do schema-based multi-tenancy in our Postgres DB. Each and every schema is associated to a different tenant and will have the exact same structure except for one schema named
To obtain the list of all the relevant schemas, we can use:...
ANSWERAnswered 2021-Dec-09 at 21:02
You can define a Postgres procedure that uses dynamic commands, e.g.:
I'm looking at turning for a very small postgres database (2 cores ver - 12.7) . Everything I have read so far says that the max_worker_processes should just be set to the number of cores allocated to postgres.
My question is, is there any harm to setting this above the number of cores?
Ultimately we're trying to use pg_cron with backend processes and for whatever reason pg_cron fails to launch a backend process if the max_worker_processes is set to less than 3.
We're considering updating max_worker_processes but we can't find any documentation or information that helps us know this won't cause other problems....
ANSWERAnswered 2021-Sep-01 at 16:13
max_worker_processes is the cluster-wide limit for the number of custom background workers and parallel workers.
Since pg_cron uses background workers, it will fail if you set the limit too low.
If you want to allow pg_cron to start enough workers, but you don't want to have too many parallel worker processes (to save on CPU resources), increase
max_worker_processes but keep
The ideal settings will depend on your requirements and your workload.
I have got two tables, 'page_visits' and 'comments', which store new webpage visits and new comments, respectively.PAGE_VISITS id page_id created_at 1 1111 2021-12-02T04:55:26.779Z 2 1442 2021-12-02T02:25:32.219Z 3 1111 2021-12-02T04:55:26.214Z COMMENTS id page_id ... created_at 1 1024 ... 2021-12-02T04:55:26.779Z 2 1111 ... 2021-12-02T02:25:32.219Z 3 3849 ... 2021-12-02T04:55:26.214Z
I want to aggregate the data from both the tables in the past 1 hour to use for analytics, such that it looks like the table below.PAGE_DATA page_id visit_count comment_count created_at 1024 14 3 2021-12-02T04:55:26.779Z 1111 11 8 2021-12-02T02:25:32.219Z 3849 1 0 2021-12-02T04:55:26.214Z 2412 0 1 2021-12-02T04:55:26.779Z ...
ANSWERAnswered 2021-Dec-05 at 21:07
Consider full join on two aggregates
I've got some
pg_cron jobs set up to periodically delete older records out of log-like files. What I'd like to do is to run
VACUUM ANALYZE after performing a purge. Unfortunately, I can't work out how to do this in a stored function. Am I missing a trick? Is a stored procedure more appropriate?
As an example, here's one of my purge routines...
ANSWERAnswered 2021-Dec-01 at 04:52
VACUUM is "top level" command. It cannot be executed from PL/pgSQL ever or from any other PL.
I'm writing up utility code to run through
pg_cron, and sometimes want the routines to insert some results into a custom table at
dba.event_log. I've got a basic log table as a starting point:
ANSWERAnswered 2021-Nov-10 at 06:38
Your function expects parameters of type
citext but you are passing values of type
text. You need to cast the parameters:
I'm working on getting
pg_cron set up on RDS, but when my
pg_cron jobs run, they return this error:
ANSWERAnswered 2021-Nov-04 at 06:04
At least in my case, the answer is to run the jobs as the same user as the
pg_cron background thread. I've posted more details to the end of the original question.
I have a plpgsql Procedure where I am simply trying to handle any possible exceptions, since I will be running these Procedures on pg_cron (automated) and I do not want anything to fail. The basic skeleton of the procedure looks like this:...
ANSWERAnswered 2021-Oct-09 at 09:57
You should really start indenting your code. This is not just about being pretty, but it would immediately show you the problem with your code.
Your code, properly indented, looks like this:
- I am trying to install pg_cron on my local machine Big Sur M1 for development https://github.com/citusdata/pg_cron
- I cannot find any instructions on how to install this on M1
- sudo yum install -y pg_cron_12 does not work
- sudo apt-get -y install postgresql-12-cron doesnt work either
- My PostgreSQL version is 13.4, how do I install pg_cron
ANSWERAnswered 2021-Sep-13 at 06:05
You'll probably have to install from source. The documentation describes that:
Aurora Postgress 12.6 Purpose: schedule to rebuild all indexes. what I did is create a function that calls all tables names and reindex concurrently and put the function in pg_cron but it gives me the error "SQL Error : ERROR: REINDEX CONCURRENTLY cannot be executed from a function". How can I archive the purpose?
ANSWERAnswered 2021-Aug-27 at 09:59
Don't do it. There is usually never a need to rebuild indexes.
You can test the indexes regularly using
pgstatindex from the
pgstattuple extension if you are worried.
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