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- <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 13. Concurrency Control</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="prev" href="textsearch-limitations.html" title="12.11. Limitations" /><link rel="next" href="mvcc-intro.html" title="13.1. Introduction" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Chapter 13. Concurrency Control</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="textsearch-limitations.html" title="12.11. Limitations">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="sql.html" title="Part II. The SQL Language">Up</a></td><th width="60%" align="center">Part II. The SQL Language</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 12.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="mvcc-intro.html" title="13.1. Introduction">Next</a></td></tr></table><hr></hr></div><div class="chapter" id="MVCC"><div class="titlepage"><div><div><h2 class="title">Chapter 13. Concurrency Control</h2></div></div></div><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="sect1"><a href="mvcc-intro.html">13.1. Introduction</a></span></dt><dt><span class="sect1"><a href="transaction-iso.html">13.2. Transaction Isolation</a></span></dt><dd><dl><dt><span class="sect2"><a href="transaction-iso.html#XACT-READ-COMMITTED">13.2.1. Read Committed Isolation Level</a></span></dt><dt><span class="sect2"><a href="transaction-iso.html#XACT-REPEATABLE-READ">13.2.2. Repeatable Read Isolation Level</a></span></dt><dt><span class="sect2"><a href="transaction-iso.html#XACT-SERIALIZABLE">13.2.3. Serializable Isolation Level</a></span></dt></dl></dd><dt><span class="sect1"><a href="explicit-locking.html">13.3. Explicit Locking</a></span></dt><dd><dl><dt><span class="sect2"><a href="explicit-locking.html#LOCKING-TABLES">13.3.1. Table-Level Locks</a></span></dt><dt><span class="sect2"><a href="explicit-locking.html#LOCKING-ROWS">13.3.2. Row-Level Locks</a></span></dt><dt><span class="sect2"><a href="explicit-locking.html#LOCKING-PAGES">13.3.3. Page-Level Locks</a></span></dt><dt><span class="sect2"><a href="explicit-locking.html#LOCKING-DEADLOCKS">13.3.4. Deadlocks</a></span></dt><dt><span class="sect2"><a href="explicit-locking.html#ADVISORY-LOCKS">13.3.5. Advisory Locks</a></span></dt></dl></dd><dt><span class="sect1"><a href="applevel-consistency.html">13.4. Data Consistency Checks at the Application Level</a></span></dt><dd><dl><dt><span class="sect2"><a href="applevel-consistency.html#SERIALIZABLE-CONSISTENCY">13.4.1. Enforcing Consistency with Serializable Transactions</a></span></dt><dt><span class="sect2"><a href="applevel-consistency.html#NON-SERIALIZABLE-CONSISTENCY">13.4.2. Enforcing Consistency with Explicit Blocking Locks</a></span></dt></dl></dd><dt><span class="sect1"><a href="mvcc-caveats.html">13.5. Caveats</a></span></dt><dt><span class="sect1"><a href="locking-indexes.html">13.6. Locking and Indexes</a></span></dt></dl></div><a id="id-1.5.12.2" class="indexterm"></a><p>
- This chapter describes the behavior of the
- <span class="productname">PostgreSQL</span> 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.
- </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="textsearch-limitations.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sql.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="mvcc-intro.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">12.11. Limitations </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 13.1. Introduction</td></tr></table></div></body></html>
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