Tuning Index Cost with ANALYZE and Statistics
Learn how the PostgreSQL planner relies on table statistics to choose indexes, and how to keep those statistics fresh so query plans stay fast.
The Planner Needs Data About Data
PostgreSQL's planner picks between index scans and sequential scans using statistics about your tables: row counts, value distributions, and more.
Stale statistics lead to bad plans.
What ANALYZE Does
The ANALYZE command samples a table and updates statistics stored in the system catalogs, so the planner estimates row counts accurately.
ANALYZE orders;All lessons in this course
- Analyzing Query Plans with EXPLAIN
- Index Usage Monitoring
- Reindexing and Index Maintenance
- Tuning Index Cost with ANALYZE and Statistics