System StatusOnline
NAV
EXPLAIN ANALYZE, index optimization, query rewriting. 10-100x speedup.
I analyze slow queries using EXPLAIN ANALYZE, identify bottlenecks (full table scans, N+1 queries, missing indexes), rewrite queries for better performance, implement caching strategies, and benchmark improvements.
Query analysis with EXPLAIN ANALYZE—understand query execution plans.
Index optimization—add missing indexes, remove unused ones.
Query rewriting—JOIN strategies, subquery optimization, materialized views.
Caching strategies—Redis, database query result caching.
Monitoring setup—identify new slow queries before they impact production.
Collect slow queries from logs, identify top offenders.
Run EXPLAIN ANALYZE, identify full table scans and missing indexes.
Rewrite queries, add indexes, implement caching.
Benchmark before/after, document improvements, set up monitoring.
EXPLAIN ANALYZE—if there is no seq scan, the index is used.
When queries filter on 2+ columns together. Order matters: equality columns first, range columns last.
Yes, when 70%+ of rows match the WHERE condition. Size reduction means faster scans.
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