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Chapter 12. Concurrency Control

Table of Contents
12.1. Introduction
12.2. Transaction Isolation
12.2.1. Read Committed Isolation Level
12.2.2. Serializable Isolation Level
12.3. Explicit Locking
12.3.1. Table-Level Locks
12.3.2. Row-Level Locks
12.3.3. Deadlocks
12.3.4. Advisory Locks
12.4. Data Consistency Checks at the Application Level
12.5. Locking and Indexes

This chapter describes the behavior of the PostgreSQL database system when two or more sessions try to access the same data at the same time. The goals in that situation are to allow efficient access for all sessions while maintaining strict data integrity. Every developer of database applications should be familiar with the topics covered in this chapter.

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