PostgreSQL

Table of Contents

13.1. Introduction

13.2. Transaction Isolation

13.2.1. Read Committed Isolation Level

13.2.2. Repeatable Read Isolation Level

13.2.3. Serializable Isolation Level

13.3. Explicit Locking

13.3.1. Table-level Locks

13.3.2. Row-level Locks

13.3.3. Page-level Locks

13.3.4. Deadlocks

13.3.5. Advisory Locks

13.4. Data Consistency Checks at the Application Level

13.4.1. Enforcing Consistency With Serializable Transactions

13.4.2. Enforcing Consistency With Explicit Blocking Locks

13.5. Caveats

13.6. 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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