PostgreSQL performance depends on proper configuration and query optimization. Here's how to tune it effectively.
Memory Configuration
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Connection Settings
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Query Analysis
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Index Optimization
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Table Maintenance
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Query Optimization
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Partitioning
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Monitoring Queries
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Configuration Checklist
Memory:
✓ shared_buffers = 25% of RAM
✓ effective_cache_size = 75% of RAM
✓ work_mem based on query complexity
✓ maintenance_work_mem for maintenance
WAL:
✓ wal_buffers = 64MB
✓ checkpoint_completion_target = 0.9
✓ max_wal_size = 4GB
Query Planner:
✓ random_page_cost = 1.1 (SSD)
✓ effective_io_concurrency = 200 (SSD)
✓ default_statistics_target = 100
Connections:
✓ Use connection pooling
✓ Appropriate max_connections
✓ Statement timeout set
Best Practices
Indexes:
✓ Index foreign keys
✓ Use partial indexes
✓ Monitor unused indexes
✓ Consider covering indexes
Queries:
✓ Use EXPLAIN ANALYZE
✓ Avoid SELECT *
✓ Use prepared statements
✓ Batch bulk operations
Maintenance:
✓ Regular VACUUM ANALYZE
✓ Monitor table bloat
✓ Archive old data
✓ Test configuration changes
Conclusion
PostgreSQL performance tuning requires understanding your workload. Configure memory based on available resources, create appropriate indexes for your queries, and monitor regularly. Use EXPLAIN ANALYZE to understand query behavior and pg_stat_statements to find optimization targets.