How to implement Parallelized Vacuum in PostgreSQL 15?

How to implement Parallelized Vacuum in PostgreSQL 15?


In PostgreSQL 15, the parallelized vacuum feature allows you to run multiple vacuum processes in parallel, which can significantly improve the performance of the vacuum operation. Here is an overview of how to implement parallelized vacuum in PostgreSQL 15:

Step 1: First, you need to have PostgreSQL 15 or later installed and running.

Step 2: Next, you will need to enable the parallel vacuum feature in your PostgreSQL configuration file (postgresql.conf). You can do this by adding the following line to the file:

Step 3: The number of parallel workers should be set based on the number of CPU cores available on your server.

Step 4: Once you have enabled the parallel vacuum feature, you can run the vacuum command with the -j option to specify the number of parallel workers to use. For example, to run a vacuum operation using 8 parallel workers, you would run the following command:

Step 5: You can also set up automatic parallelized vacuuming by setting up the autovacuum configuration parameters, such as autovacuum_vacuum_scale_factor and autovacuum_vacuum_cost_limit

Step 5: It’s important to monitor and test the performance of the parallelized vacuum to ensure that it is improving the performance of the vacuum operation and not causing any negative impacts on the system.

Please note that parallelized vacuum may not improve performance for all workloads, and it’s important to test the performance of the parallelized vacuum on your specific workloads before enabling it in production environments.

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