Tag: analyze
GRANT VACUUM, ANALYZE in PostgreSQL 16
What is GRANT VACUUM, ANALYZE? PostgreSQL uses table VACUUM and ANALYZE commands to optimize the database. The VACUUM command reclaims storage space and makes it available for re-use. It also updates the visibility map, which helps the query planner to quickly identify which parts of the table have live rows. The ANALYZE command collects statistics […]
How to interpret PostgreSQL EXPLAIN ANALYZE output
© Laurenz Albe 2021 UPDATED July 2023: EXPLAIN ANALYZE is the key to optimizing SQL statements in PostgreSQL. This article does not attempt to explain everything there is to it. Rather, I want to give you a brief introduction, explain what to look for and show you some helpful tools to visualize the output. Also, […]
PostgreSQL: ANALYZE and optimizer statistics
Our PostgreSQL 24×7 support team recently received a request from one of our customers who was facing a performance problem. The solution to the problem could be found in the way PostgreSQL handles query optimization (specifically, statistics). So I thought it would be nice to share some of this knowledge with my beloved readers. The […]