Trade offs and Considerations for PostgreSQL CLUSTER Command
summary
Clustering a table yields faster sequential and range query reads for reporting heavy workloads but costs more memory, CPU and time to build and table lock during CLUSTER which blocks writes while running. Run EXPLAIN ANALYZE VERBOSE to check whether queries read pages sequentially and whether the table is a good candidate roughly 20–30% of access pattern fits. Clustering increases maintenance after bulk loads, updates or deletes and is not recommended for write‑heavy transactional tables.
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