Merge pull request #280846 from varun-dhawan/varund-jul

[PostgreSQL] updates PG16 MVU details

Author: prmerger-automator[bot]

articles/postgresql/flexible-server/concepts-major-version-upgrade.md

@@ -3,7 +3,7 @@ title: Major version upgrades in Azure Database for PostgreSQL - Flexible Server
 description: Learn how to use Azure Database for PostgreSQL - Flexible Server to do in-place major version upgrades of PostgreSQL on a server.
 author: varun-dhawan
 ms.author: varundhawan
-ms.date: 7/12/2024
+ms.date: 7/15/2024
 ms.service: postgresql
 ms.subservice: flexible-server
 ms.topic: conceptual
@@ -47,6 +47,8 @@ Here are some of the important considerations with in-place major version upgrad
 
 - Azure Database for PostgreSQL Flexible Server takes snapshot of your database during an upgrade. The snapshot is taken before the upgrade starts. If the upgrade fails, the system will automatically restore your database to its state from the snapshot.
 
+- [PostgreSQL 16 introduces role-based security](./concepts-security.md#postgresql-16-changes-with-role-based-security) measures. After a major version upgrade on Azure Database for PostgreSQL Flexible Server, the first user created on the server—who is granted the ADMIN option—will now have administrative privileges over other roles for essential maintenance operations.
+
 ## Post upgrade/migrate
 
 After the major version upgrade is complete, we recommend to run the `ANALYZE` command  in each database to refresh the `pg_statistic` table. Otherwise, you may run into performance issues.