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Upgrade cluster in Azure Cosmos DB for PostgreSQL

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APPLIES TO: Azure Cosmos DB for PostgreSQL (powered by the Citus database extension to PostgreSQL)

These instructions describe how to upgrade to a new major version of PostgreSQL on all cluster nodes.

Test the upgrade first

Upgrading PostgreSQL causes more changes than you might imagine, because Azure Cosmos DB for PostgreSQL will also upgrade the database extensions, including the Citus extension. Upgrades also require downtime in the database cluster.

We strongly recommend you to test your application with the new PostgreSQL and Citus version before you upgrade your production environment. Also, see our list of upgrade precautions.

A convenient way to test is to make a copy of your cluster using point-in-time restore. Upgrade the copy and test your application against it. Once you've verified everything works properly, upgrade the original cluster.

Upgrade a cluster in the Azure portal

  1. In the Overview section of a cluster, select the Upgrade button.
  2. A dialog appears, showing the current version of PostgreSQL and Citus. Choose a new PostgreSQL version in the PostgreSQL version to upgrade list.
  3. Verify that the value in Citus version to upgrade is what you expect. This value changes based on the PostgreSQL version you selected.
  4. Select the Upgrade button to continue.

Note

If you're already running the latest PostgreSQL version, the selection and button are grayed out.

Post-upgrade tasks

After a major PostgreSQL version upgrade, run the ANALYZE operation to refresh the pg_statistic table. pg_statistic is a system catalog table in PostgreSQL that stores statistical data about the content of table columns and index expressions. Entries in pg_statistic are created by the ANALYZE command and used by the query planner.

Run the ANALYZE command without any parameters to generate statistics for the tables in the database on your cluster. The default database name is 'citus'. If custom database name was used at the cluster creation time, you can find it on the Overview page of your cluster's properties. Using the optional VERBOSE flag allows you to see the progress.

ANALYZE VERBOSE;

Note

Database performance might be impacted if you don't run ANALYZE operation after the major PostgreSQL version upgrade on your cluster.

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