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Diagnose Postgres Deadlocks and Long Lock Waits

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Self-Hosting & Infra advanced 8 min read $0.01 Updated 2026-10-19

Diagnosing Postgres lock problems: pg_stat_activity and pg_blocking_pids, deadlock log reading, consistent lock ordering, SELECT FOR UPDATE SKIP LOCKED, DDL lock queues, lock_timeout, idle in transaction sessions and safe migrations.

Queries hang waiting on locks, or Postgres reports "deadlock detected". Find the blocking session with pg_locks, understand lock modes, fix lock ordering and shorten transactions.

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#postgres#deadlock#locks#database#troubleshooting

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