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PostgreSQL · Concept

MVCC

PostgreSQL uses MVCC to give statements consistent snapshots while concurrent transactions run. Normal reads and writes do not block each other.

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  • Transaction Isolation
  • Read Committed Isolation Level
  • Repeatable Read Isolation Level
  • Serializable Isolation Level
  • Explicit Locking
  • Advisory Locks

Source: PostgreSQL: Documentation: 18: 13.1. Introduction. Checked 2026-11-03.