Adding PostgreSQL Tuple Statistics Dashboard to the PMM Plugin

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While the PMM Engineering team is working on the polish for release of PMM 2, I wanted to share with you some of the dashboard improvements we’re making around PostgreSQL, specifically how you can plot Tuple Statistics using PMM. PMM (Percona Monitoring and Management) is a free and open-source platform for managing and monitoring MySQL®, MongoDB®, and PostgreSQL performance. You can run PMM in your own environment for maximum security and reliability. It provides thorough time-based analysis for MySQL, MongoDB, and PostgreSQL servers to ensure that your data works as efficiently as possible.

This new dashboard is based on data collected from the pg_stat_user_tables view. However, by default, postgres_exporter doesn’t collect this information. Instead we will leverage the exporter’s ability to run custom SELECT queries from a file (queries.yaml in our example). These generate metric series in PMM that we can then visualize. Collecting tuple information using pg_stat_user_users view requires that databases be identified in queries.yaml, so we’ve written a helper script that takes multiple database names and formats the queries.yaml file accordingly.

Setting up the dashboard

First of all we have to enable the extension dblink. It’s a PostgreSQL contrib extension that allows users to connect to other databases and to run arbitrary queries in them.

The next step is to create a query for collecting data from tables. We propose to use our bash script that generates a query and forms other fields for a custom query file. You have to specify the database name, or names, that will be monitored. You can store the result of the script in a separate file or can extend an existing file with queries.

Now lets run the exporter with this file /home/ec2-user/queries.yaml. Please use flag extend.query-path as in the example below. If you want to change exporter options, the procedure is to remove then add back the exporter with the new option identified.

The PostgreSQL Tuple Statistics Dashboard is available on GrafanaLab for download under the perconalab organization.

Here are some screenshots from our test installation.

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