Interview Q&A / PostgreSQL
PostgreSQL interview questions
Indexes, EXPLAIN, transactions and isolation, JSONB and the Postgres specifics backend interviews probe.
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- What is the difference between EXPLAIN and EXPLAIN ANALYZE, and how do you read a query plan?
EXPLAIN shows the plan PostgreSQL intends to use, with estimated costs and row counts, without running the query. EXPLAIN ANALYZE actually runs the query and adds real timings and real row counts, so you can compare estimates with reality.
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