---
title: "Transaction Processing"
id: transactions
pg_version: "20devel"
---

<a id="transactions"></a>

# Transaction Processing

## Table of Contents

- [67.1. Transactions and Identifiers](transaction-id.md)
- [67.2. Transactions and Locking](xact-locking.md)
- [67.3. Subtransactions](subxacts.md)
- [67.4. Two-Phase Transactions](two-phase.md)

This chapter provides an overview of the internals of PostgreSQL's transaction management system. The word transaction is often abbreviated as *xact*.