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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
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>Concurrency Control</TITLE
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><DIV
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><H1
><A
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></A
>Chapter 13. Concurrency Control</H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>13.1. <A
HREF="mvcc-intro.html"
>Introduction</A
></DT
><DT
>13.2. <A
HREF="transaction-iso.html"
>Transaction Isolation</A
></DT
><DD
><DL
><DT
>13.2.1. <A
HREF="transaction-iso.html#XACT-READ-COMMITTED"
>Read Committed Isolation Level</A
></DT
><DT
>13.2.2. <A
HREF="transaction-iso.html#XACT-REPEATABLE-READ"
>Repeatable Read Isolation Level</A
></DT
><DT
>13.2.3. <A
HREF="transaction-iso.html#XACT-SERIALIZABLE"
>Serializable Isolation Level</A
></DT
></DL
></DD
><DT
>13.3. <A
HREF="explicit-locking.html"
>Explicit Locking</A
></DT
><DD
><DL
><DT
>13.3.1. <A
HREF="explicit-locking.html#LOCKING-TABLES"
>Table-level Locks</A
></DT
><DT
>13.3.2. <A
HREF="explicit-locking.html#LOCKING-ROWS"
>Row-level Locks</A
></DT
><DT
>13.3.3. <A
HREF="explicit-locking.html#LOCKING-DEADLOCKS"
>Deadlocks</A
></DT
><DT
>13.3.4. <A
HREF="explicit-locking.html#ADVISORY-LOCKS"
>Advisory Locks</A
></DT
></DL
></DD
><DT
>13.4. <A
HREF="applevel-consistency.html"
>Data Consistency Checks at the Application Level</A
></DT
><DD
><DL
><DT
>13.4.1. <A
HREF="applevel-consistency.html#SERIALIZABLE-CONSISTENCY"
>Enforcing Consistency With Serializable Transactions</A
></DT
><DT
>13.4.2. <A
HREF="applevel-consistency.html#NON-SERIALIZABLE-CONSISTENCY"
>Enforcing Consistency With Explicit Blocking Locks</A
></DT
></DL
></DD
><DT
>13.5. <A
HREF="mvcc-caveats.html"
>Caveats</A
></DT
><DT
>13.6. <A
HREF="locking-indexes.html"
>Locking and Indexes</A
></DT
></DL
></DIV
><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
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