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From: jacob ndinkwa <[email protected]>
To: Sathish Reddy <[email protected]>
Cc: [email protected]
Cc: Keith <[email protected]>
Cc: [email protected]
Cc: Laurenz Albe <[email protected]>
Subject: Re: Schedule pg_repack job with pg_cron
Date: Wed, 7 Aug 2024 09:24:16 -0400
Message-ID: <CAKFm-3Coe2SxvdnvO=Gd2yTUWd9svrtcMc5ij-VHCP1AOA+mPQ@mail.gmail.com> (raw)
In-Reply-To: <CA+M9Y+DfTmOqqeua1U+7jWPiovpHjmG7AZ-UfcacDueiRo2Vyg@mail.gmail.com>
References: <CA+M9Y+DfTmOqqeua1U+7jWPiovpHjmG7AZ-UfcacDueiRo2Vyg@mail.gmail.com>

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 <
[email protected]> 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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