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178 lines
3.8 KiB
Plaintext
178 lines
3.8 KiB
Plaintext
<REFENTRY ID="SQL-BEGINWORK">
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<REFMETA>
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<REFENTRYTITLE>
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BEGIN WORK
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</REFENTRYTITLE>
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<REFMISCINFO>SQL - Language Statements</REFMISCINFO>
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</REFMETA>
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<REFNAMEDIV>
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<REFNAME>
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BEGIN WORK
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</REFNAME>
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<REFPURPOSE>
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Begins a transaction
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</REFPURPOSE>
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<REFSYNOPSISDIV>
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<REFSYNOPSISDIVINFO>
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<DATE>1998-09-08</DATE>
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</REFSYNOPSISDIVINFO>
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<SYNOPSIS>
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BEGIN [ WORK | TRANSACTION ]
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</SYNOPSIS>
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<REFSECT2 ID="R2-SQL-BEGINWORK-1">
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<REFSECT2INFO>
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<DATE>1998-09-08</DATE>
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</REFSECT2INFO>
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<TITLE>
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Inputs
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</TITLE>
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<PARA>
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None
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</REFSECT2>
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<REFSECT2 ID="R2-SQL-BEGINWORK-2">
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<REFSECT2INFO>
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<DATE>1998-09-08</DATE>
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</REFSECT2INFO>
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<TITLE>
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Outputs
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</TITLE>
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<PARA>
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</PARA>
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<VARIABLELIST>
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<VARLISTENTRY>
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<TERM>
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<replaceable>status</replaceable>
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</TERM>
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<LISTITEM>
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<PARA>
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<VARIABLELIST>
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<VARLISTENTRY>
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<TERM>
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<returnvalue>BEGIN</returnvalue>
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</TERM>
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<LISTITEM>
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<PARA>
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This signifies that a new transaction has been started.
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</PARA>
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</LISTITEM>
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</VARLISTENTRY>
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<VARLISTENTRY>
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<TERM>
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<returnvalue>NOTICE: BeginTransactionBlock and not in default state</returnvalue>
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</TERM>
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<LISTITEM>
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<PARA>
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This indicates that a transaction was already in progress.
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The current transaction is not affected.
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</PARA>
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</LISTITEM>
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</VARLISTENTRY>
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</variablelist>
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</para>
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</LISTITEM>
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</VARLISTENTRY>
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</VARIABLELIST>
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</REFSECT2>
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</REFSYNOPSISDIV>
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<REFSECT1 ID="R1-SQL-BEGINWORK-1">
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<REFSECT1INFO>
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<DATE>1998-09-08</DATE>
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</REFSECT1INFO>
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<TITLE>
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Description
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</TITLE>
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<para>
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<command>BEGIN</command> initiates a user transaction
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which <productname>Postgres</productname> will
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guarantee is serializable with respect to all concurrently
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executing transactions. <productname>Postgres</productname> uses two-phase
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locking
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to perform this task. If the transaction is committed,
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<productname>Postgres</productname> will ensure either that all updates are
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done or else
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that none of
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them are done. Transactions have the standard ACID
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(atomic, consistent, isolatable, and durable) property.
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</para>
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<REFSECT2 ID="R2-SQL-BEGINWORK-3">
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<REFSECT2INFO>
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<DATE>1998-09-08</DATE>
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</REFSECT2INFO>
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<TITLE>
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Notes
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</TITLE>
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<PARA>
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The keyword TRANSACTION is just a cosmetic alternative to WORK.
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Neither keyword need be specified.
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</PARA>
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<PARA>
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Refer to the <command>LOCK</command> statement for further information
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about locking tables inside a transaction.
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</PARA>
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<PARA>
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Use <command>COMMIT</command> or <command>ROLLBACK</command>
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to terminate a transaction.
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</PARA>
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</REFSECT2>
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<REFSECT1 ID="R1-SQL-BEGINWORK-2">
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<TITLE>
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Usage
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</TITLE>
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<PARA>To begin a user transaction:
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<ProgramListing>
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BEGIN WORK;
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</ProgramListing>
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</REFSECT1>
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<REFSECT1 ID="R1-SQL-BEGINWORK-3">
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<TITLE>
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Compatibility
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</TITLE>
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<PARA>
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<command>BEGIN</command>
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is a <productname>Postgres</productname> language extension.
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<REFSECT2 ID="R2-SQL-BEGINWORK-4">
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<REFSECT2INFO>
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<DATE>1998-09-08</DATE>
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</REFSECT2INFO>
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<TITLE>
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SQL92
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</TITLE>
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<PARA>
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There is no explicit BEGIN WORK command in <acronym>SQL92</acronym>;
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transaction initiation
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is always implicit and it terminates either with a COMMIT or with
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a ROLLBACK statement.
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</PARA>
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</refsect2>
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</refsect1>
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</REFENTRY>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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sgml-parent-document:nil
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sgml-default-dtd-file:"../reference.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:"/usr/lib/sgml/catalog"
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sgml-local-ecat-files:nil
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End:
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-->
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