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Interview Q&A / PostgreSQL

INTERVIEW Q&A · 69 QUESTIONS

PostgreSQL interview questions

Indexes, EXPLAIN, transactions and isolation, JSONB and the Postgres specifics backend interviews probe.

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  1. How does FOR UPDATE SKIP LOCKED help build a job queue in PostgreSQL?

    SKIP LOCKED makes a query ignore rows another transaction has already locked instead of waiting. Several workers can each grab different pending jobs at the same time without blocking or double-processing.

    IntermediateQuick answer1 min read