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PostgreSQL works well out of the box. Your data grows. You need to tune it. Follow a system. Measure. Identify. Optimize. Focus on slow queries first.
Use indexes. Add them to columns in WHERE, JOIN, and ORDER BY clauses. Use EXPLAIN ANALYZE to check if they work. Use composite indexes for filters on multiple columns.
Pick the right index:
- B-tree: Works for most cases.
- Hash: Fast for equality.
- GiN and GiST: For full-text search and arrays.
- Partial: For a small set of rows.
Read query plans with EXPLAIN. Look for sequential scans on big tables. These show missing indexes. Watch for nested loop joins.
Manage connections. Each connection uses memory and CPU. Use PgBouncer or PostgreSQL 17 features. Set max_connections to 100.
Keep the database clean. Updates and deletes leave dead tuples. Autovacuum cleans these. Monitor table bloat.
Tune your settings:
- shared_buffers: 25% of your RAM.
- effective_cache_size: Total filesystem cache.
- work_mem: Memory for sorts and joins.
Do regular maintenance. Use pg_stat_statements. Delete unused indexes. Rebuild bloated ones.
Source: https://dev.to/therizwansaleem/postgresql-performance-tuning-indexes-queries-and-configuration-36g0