Indexing every WHERE column is not PostgreSQL optimization

Short summary

PostgreSQL query optimization requires understanding that composite B-tree index effectiveness depends on predicate type (equality before range predicates), column order, selectivity statistics, and table size—not just covering all filtered columns. The query planner must actually choose your index for it to help. Tools like pgAssistant automate this analysis using EXPLAIN ANALYZE and optimizer statistics.

• •Equality predicates should come before range predicates in composite indexes
• •Index effectiveness depends on table size, n_distinct statistics, and planner decisions
• •pgAssistant automates index recommendations using EXPLAIN ANALYZE

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