Chapter 14. Performance Tips

Table of Contents

• 14.1. Using EXPLAIN

  • • 14.1.1. EXPLAIN Basics

  • 14.1.2. EXPLAIN ANALYZE

  • 14.1.3. Caveats

• 14.2. Statistics Used by the Planner

  • • 14.2.1. Single-Column Statistics

  • 14.2.2. Extended Statistics

• 14.3. Controlling the Planner with Explicit JOIN Clauses

• 14.4. Populating a Database

  • • 14.4.1. Disable Autocommit

  • 14.4.2. Use COPY

  • 14.4.3. Remove Indexes

  • 14.4.4. Remove Foreign Key Constraints

  • 14.4.5. Increase maintenance_work_mem

  • 14.4.6. Increase max_wal_size

  • 14.4.7. Disable WAL Archival and Streaming Replication

  • 14.4.8. Run ANALYZE Afterwards

  • 14.4.9. Some Notes About pg_dump

• 14.5. Non-Durable Settings

Query performance can be affected by many things. Some of these can be controlled by the user, while others are fundamental to the underlying design of the system. This chapter provides some hints about understanding and tuning PostgreSQL performance.