Answer
Optimize joins using proper join orders, indexing, avoiding functions on indexed columns, and ensuring accurate statistics.
Quick Answer
Join performance optimization: ensure join columns are indexed on both sides. Check EXPLAIN ANALYZE for nested loop vs hash join vs merge join. nested loop is good for small tables or index lookups; hash join for large unsorted tables; merge join for pre-sorted data. Increase work_mem (default 4MB) to allow hash joins to stay in memory instead of spilling to disk. Rewrite queries to join on indexed columns.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ