PostgreSQL 16 marks a significant stride in database performance through a series of query planner enhancements. ![]() This update reduces the effort needed to rewrite queries, thereby easing the migration path and potentially speeding up the transition to PostgreSQL. However, starting with PostgreSQL 16, you can run a query like SELECT * FROM (SELECT 1) without needing to assign an alias to the subquery. In prior versions, a subquery in the FROM clause required an alias otherwise, it would result in an error. PostgreSQL 16 introduces a more flexible approach to subqueries, making the transition from databases like Oracle smoother. Subquery in FROM does NOT require an alias The require_auth option further strengthens security by allowing the specification of secure authentication methods, like require_auth=scram-sha-256, ensuring the use of stringent authentication protocols. When utilized alongside target_session_attrs=standby, it directs connections to standby servers, which is key for scalable and resilient architecture. This load balancing feature is particularly advantageous for spreading out the workload on multiple replica servers. The load_balance_hosts=random option is an addition that transforms connection distribution by enabling random selection among a list of hosts. For those interested in understanding this new Postgres feature in depth, there's a video available from the author of pg_stat_io and a Postgres teammate of mine here at Microsoft, Melanie Plageman, offering a thorough explanation of how pg_stat_io works and how to leverage it for database optimization.ĭatabase adapters based on libpq, which are used across a host of programming languages, including Python, C, C++, and Ruby, now include enhancements that greatly improve scalability and security within database systems. This granular visibility is invaluable for database administrators looking to optimize their systems for better performance and efficiency. With pg_stat_io, the information is broken down by backend type, IO context, and IO operation, delivering a level of detail that was not available before. Previously, statistics in PostgreSQL were not detailed enough to provide the necessary information for fine-tuning performance. This addition is a leap forward for database monitoring and performance tuning. PostgreSQL 16 introduces pg_stat_io, a new comprehensive view that offers deeper insights into IO activity within the database. Users of Azure Database for PostgreSQL - Flexible Server can now explore more sophisticated and scalable database architectures with the adoption of this new feature.Ĭascading replication, combining physical and logical replication. By shifting some of the data replication responsibilities away from the primary server to read replicas, it reduces the load on the primary server.įurthermore, the combination of physical and logical replication methods enhances the robustness of the database setup. This development is not just an incremental update - it's a game-changer that opens new architectural possibilities. PostgreSQL 16 introduces a feature that expands the capabilities of Azure Database for PostgreSQL - Flexible Server: the ability to perform logical replication directly from read replicas. Logical replication from read replica servers For those using older versions of PostgreSQL, the pg_failover_slots extension can provide similar functionality for versions up to PostgreSQL 15. This update is a big help for anyone using HA with logical replication. The standby server will recognize the replication slots from the primary server, so you don't have to set them up again after a failover. Now, PostgreSQL 16 has improved this process. This was a problem because it meant you'd have to recreate the replication slots and resynchronize the data. Previously, in the event of a failover, the replication slots would be lost. If you're using both High Availability (HA) and logical replication in PostgreSQL, there's good news with version 16. Preserving replication slots after failover ![]() Let’s dive into what this update means for you as an Azure Database for PostgreSQL - Flexible Server user. Whether it’s for scaling your application or improving overall database performance, PostgreSQL 16 offers valuable new tools and improvements. These features aim to support Azure users in managing their databases more efficiently and with greater ease. In the following article, we will outline some key features of PostgreSQL 16, focusing on areas such as replication enhancements, performance improvements, and query optimization. This version introduces a variety of new features that are designed to enhance the functionality and performance of your databases. ![]() We're excited to share that PostgreSQL 16 is now generally available on Azure Database for PostgreSQL - Flexible Server.
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