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Perform a PostgreSQL® major version upgrade

PostgreSQL® in-place upgrades allows to upgrade an instances to a new major version without needing to fork and redirect the traffic. The whole procedure usually takes 60 seconds or less for small databases.

Before you begin​

Create a read-only replica​

We recommend creating a read-only replica before the upgrade:

  • Very large databases may take a long time to upgrade and will be unreadable during the upgrade. You can use a read-only replica service to keep the data readable during an upgrade.

  • A PostgreSQL upgrade has some risk of downtime and data loss if the node goes down before the system is back in a normal state. A read-only replica can help reduce this risk.

Test upgrading on a fork​

We recommend to test the upgrade on a fork of the database to be upgraded. Testing on a fork provides the benefit of verifying the impact of the upgrade for the specific service without affecting the running service, mostly to:

  1. Ensure that the upgrade succeeds and is performed quickly enough, which might not be the case if there are many databases or large objects.

    Smaller node sizes with a large dataset can run into OOM issues during the pg_dump/pg_restore phase of pg_upgrade --link. A fork will reveal this scenario.

  2. Test query performance directly after upgrade under real world load, when no statistics are available and caches are cold.

Upgrade to major versions in sequence​

important

It's not recommended to upgrade across multiple major versions in a single pass.

For example, if you're on version 1.0 and need to be on 4.0, first upgrade to 2.0, next to 3.0, and finally to 4.0. Avoid updating from 1.0 directly to 4.0.

Upgrade to a major version​

To upgrade a PostgreSQL service:

  1. Log in to Aiven Console, and select the instance to upgrade.

  2. Select Service settings from the sidebar of your service's page.

  3. Go to the Service management section, click Actions > Upgrade version.

  4. In the Upgrade Aiven for PostgreSQL Confirmation window, select the version to upgrade to from the dropdown menu.

    note

    When you select the version, the system checks the compatibility of the upgrade.

    warning

    Upon clicking Upgrade:

    • The system applies the upgrade immediately.
    • The PostgreSQL instance can't be restored to the previous version.
    • Backups created with an earlier major version are no longer visible in the Aiven Console and cannot be used for operations such as Point In Time Recovery (PiTR). You can only use backups created after the major version upgrade for such purposes.

  5. Select Upgrade.

    1. An automatic check is executed to confirm whether an upgrade is possible (pg_upgrade --check).
    2. If the service has more than one node, any standby nodes are shut down and removed, as replication can not be performed during the upgrade.
    3. The primary node starts an in-place upgrade to the new major version.
    4. After a successful upgrade the primary node becomes available for use. A new full backup is initiated.
    5. After completion of the full backup, new standby nodes are created for services with more than one node.
    6. If the service is a configured to have a read-only replica service, the replica service will now be upgraded to the same version using the very same process. Read-only replicas remain readable during the upgrade of the primary service, but will go offline for the upgrade at this point.
    7. ANALYZE will be automatically run for all tables after the upgrade to refresh table statistics and optimize queries.
note

A full backup of a large database may take a long time to complete. It may take some time before the standby node becomes available, as they can only be launched when a backup taken from the new version is available.

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