PostgreSQL Enterprise & Performance
10+ Years (Principal / Architect)
Expert
Production Scenario
How do you tune `shared_buffers`, `work_mem`, and `maintenance_work_mem` for optimal PostgreSQL performance?
Real-World Scenario / Incident Description
Configuring a new 64-core, 256GB RAM database server for heavy OLTP workloads.
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Updated 1 month ago
Optimal Memory Configuration
shared_buffers: Set to 25% of total RAM (64GB). PostgreSQL relies heavily on the Linux OS Page Cache for the remaining 75%.work_mem: Allocated per-sort/hash operation per client (e.g.32MBto64MB). (Formula:(Available RAM / Max Connections) / 3).maintenance_work_mem: Allocated forVACUUMandCREATE INDEX(e.g.4GB).effective_cache_size: Set to 75% of total RAM (192GB) to inform the optimizer of OS cache capacity.
Related Concepts:
#PostgreSQL Tuning
#Memory Configuration
#DevOps
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