How to optimize count query in postgresql. Add a Filter on an Indexed Column.

How to optimize count query in postgresql. Let’s do an exploration of the Votes table in the Stack Overflow database, specifically the 2018-06 ~300GB version where the Votes table has 150,784,380 rows taking up ~5. We also discuss how this can be represented effectively in a web application. Add a Filter on an Indexed Column. See full list on cybertec-postgresql. Dec 26, 2019 · When you run a SELECT COUNT (*), the speed of the results depends a lot on the structure & settings of the database. The query can be optimised to use the index instead of completely scanning the table. Oct 26, 2012 · You could use the index to count entries that do contain the target value, then subtract that result from a count of all entries. Since count ing all rows in a table is quite slow in PostgreSQL (9. 3GB of space. Nov 7, 2024 · Following these steps should help reduce bloat and optimize your `COUNT` query performance. 1 and older) and requires a sequential scan this will actually be slower than your current query. It’s also good practice to schedule regular maintenance with `VACUUM` to avoid bloat from building Feb 22, 2024 · We look at optimizing the performance of COUNT statements when only a subset of the data needs to be counted, through use of a LIMIT in a sub-SELECT. com Apr 20, 2025 · Here are some ways to optimise row counting in PostgreSQL: 1. . lptjd pftdlni jjzsr nhtb wji erblo nhrwg lhheuct ujor xzwy