From: | jacob ndinkwa <jndinkwa(at)gmail(dot)com> |
---|---|
To: | Sathish Reddy <sathishreddy(dot)postgresql(at)gmail(dot)com> |
Cc: | pgsql-admin(at)lists(dot)postgresql(dot)org, Keith <keith(at)keithf4(dot)com>, keith(dot)fiske(at)crunchydata(dot)com, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at> |
Subject: | Re: Schedule pg_repack job with pg_cron |
Date: | 2024-08-07 13:24:16 |
Message-ID: | CAKFm-3Coe2SxvdnvO=Gd2yTUWd9svrtcMc5ij-VHCP1AOA+mPQ@mail.gmail.com |
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Lists: | pgsql-admin |
Hello Sathish,
To schedule a pg_repack job using pg_cron on an Amazon RDS for PostgreSQL
instance, you need to follow a few steps. However, it’s important to note
that pg_cron is only supported on certain versions of Amazon RDS, and
pg_repack is also a separate extension that must be installed and enabled.
Here’s a general guide on how you can set this up:
*Prerequisites*
1. *Check Compatibility*: Ensure that your RDS instance supports pg_cron
and pg_repack. Both extensions need to be available and supported by the
RDS version you are using.
2. *Install pg_repack*: Ensure pg_repack is installed on your RDS
instance. You can install it via the AWS Management Console if it's
available for your PostgreSQL version. For example:
- Go to *RDS Dashboard* -> *Parameter Groups*.
- Modify the parameter group associated with your RDS instance to add
pg_repack to the shared_preload_libraries parameter.
3. *Enable pg_cron*: Similarly, ensure that pg_cron is enabled. You may
need to add pg_cron to the shared_preload_libraries in your parameter group
and reboot your instance.
*Setting Up the Job*
1. *Create the pg_cron Extension*: First, create the pg_cron extension
in your database:
sql
Copy code
CREATE EXTENSION IF NOT EXISTS pg_cron;
2. *Create the pg_repack Extension*: Similarly, create the pg_repack
extension:
sql
Copy code
CREATE EXTENSION IF NOT EXISTS pg_repack;
3. *Schedule a pg_repack Job*: You can schedule a job using pg_cron to
run pg_repack. Here is an example of how to set up a weekly job:
sql
Copy code
SELECT cron.schedule(
'weekly_repack',
'0 3 * * 0', -- This runs every Sunday at 3 AM
$$
SELECT pg_repack.repack_database();
$$);
In this example, pg_repack.repack_database() is called to reorganize the
database. Adjust the schedule expression (0 3 * * 0) as needed to fit your
desired schedule.
*Considerations*
- *Permissions*: Ensure the user running the pg_cron job has the
necessary permissions to execute pg_repack.
- *Performance Impact*: Running pg_repack can be resource-intensive.
Schedule the job during off-peak hours to minimize the impact on your
database.
- *Testing*: Before scheduling the job, test pg_repack on a
non-production instance to ensure it behaves as expected.
- *Monitoring*: Monitor the job to ensure it completes successfully and
troubleshoot any issues that arise.
By setting up pg_repack with pg_cron on Amazon RDS for PostgreSQL, you can
automate the process of reclaiming disk space and improving database
performance without significant downtime.
Thanks!
Jake
On Wed, Aug 7, 2024 at 4:53 AM Sathish Reddy <
sathishreddy(dot)postgresql(at)gmail(dot)com> wrote:
> Hi
> Please share the details for pg_repack job schedule with pg_cron from
> RDS postgres database instance level.
>
> Thanks
> Sathishreddy
>
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