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Add input parameters for LOCK TABLE. Still needs explanation from Vadim.

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Fix markup.
This commit is contained in:
Thomas G. Lockhart
1999-06-04 15:50:44 +00:00
parent 39fc813951
commit ebfbb79f25
2 changed files with 645 additions and 576 deletions
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244
doc/src/sgml/ref/lock.sgml
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@ -1,84 +1,156 @@
<REFENTRY ID="SQL-LOCK"> <refentry id="SQL-LOCK">
<REFMETA> <refmeta>
<REFENTRYTITLE> <refentrytitle>
LOCK LOCK
</REFENTRYTITLE> </refentrytitle>
<REFMISCINFO>SQL - Language Statements</REFMISCINFO> <refmiscinfo>SQL - Language Statements</refmiscinfo>
</REFMETA> </refmeta>
<REFNAMEDIV> <refnamediv>
<REFNAME> <refname>
LOCK LOCK
</REFNAME> </refname>
<REFPURPOSE> <refpurpose>
Explicit lock of a table inside a transaction Explicit lock of a table inside a transaction
</REFPURPOSE> </refpurpose>
</refnamediv> </refnamediv>
<REFSYNOPSISDIV> <refsynopsisdiv>
<REFSYNOPSISDIVINFO> <refsynopsisdivinfo>
<DATE>1998-09-24</DATE> <date>1998-09-24</date>
</REFSYNOPSISDIVINFO> </refsynopsisdivinfo>
<SYNOPSIS> <synopsis>
LOCK [ TABLE ] [IN [ROW|ACCESS] [SHARE|EXCLUSIVE] | [SHARE ROW EXCLUSIVE] MODE] LOCK [ TABLE ] <replaceable class="PARAMETER">table</replaceable>
<REPLACEABLE CLASS="PARAMETER">table</REPLACEABLE> LOCK [ TABLE ] <replaceable class="PARAMETER">table</replaceable> IN [ ROW | ACCESS ] { SHARE | EXCLUSIVE } MODE
</SYNOPSIS> LOCK [ TABLE ] <replaceable class="PARAMETER">table</replaceable> IN SHARE ROW EXCLUSIVE MODE
</synopsis>
<REFSECT2 ID="R2-SQL-LOCK-1"> <refsect2 id="R2-SQL-LOCK-1">
<REFSECT2INFO> <refsect2info>
<DATE>1998-09-01</DATE> <date>1998-09-01</date>
</REFSECT2INFO> </refsect2info>
<TITLE> <title>
Inputs Inputs
</TITLE> </title>
<PARA> <para>
</PARA>
<VARIABLELIST> <variablelist>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
<REPLACEABLE CLASS="PARAMETER">table</REPLACEABLE> <replaceable class="PARAMETER">table</replaceable>
</TERM> </term>
<LISTITEM> <listitem>
<PARA> <para>
The name of an existing table to lock. The name of an existing table to lock.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
</VARIABLELIST>
</REFSECT2> <varlistentry>
<term>
SHARE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<REFSECT2 ID="R2-SQL-LOCK-2"> <varlistentry>
<REFSECT2INFO> <term>
<DATE>1998-09-24</DATE> EXCLUSIVE MODE
</REFSECT2INFO> </term>
<TITLE> <listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
ROW SHARE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
ROW EXCLUSIVE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
ACCESS SHARE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
ACCESS EXCLUSIVE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
SHARE ROW EXCLUSIVE MODE
</term>
<listitem>
<para>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect2>
<refsect2 id="R2-SQL-LOCK-2">
<refsect2info>
<date>1998-09-24</date>
</refsect2info>
<title>
Outputs Outputs
</TITLE> </title>
<PARA> <para>
<VARIABLELIST> <variablelist>
<TERM> <varlistentry>
ERROR <REPLACEABLE CLASS="PARAMETER">table</REPLACEABLE>: Table does not exist. <term>
</TERM> ERROR <replaceable class="PARAMETER">table</replaceable>: Table does not exist.
<LISTITEM> </term>
<PARA> <listitem>
Message returned if <REPLACEABLE CLASS="PARAMETER">table</REPLACEABLE> <para>
Message returned if <replaceable class="PARAMETER">table</replaceable>
does not exist. does not exist.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
</VARIABLELIST> </variablelist>
</para> </para>
</REFSECT2> </refsect2>
</REFSYNOPSISDIV> </refsynopsisdiv>
<REFSECT1 ID="R1-SQL-LOCK-1"> <refsect1 id="R1-SQL-LOCK-1">
<REFSECT1INFO> <refsect1info>
<DATE>1998-09-24</DATE> <date>1998-09-24</date>
</REFSECT1INFO> </refsect1info>
<TITLE> <title>
Description Description
</TITLE> </title>
<PARA> <para>
By default, <command>LOCK</command> locks in exclusive mode a table inside By default, <command>LOCK</command> locks in exclusive mode a table inside
a transaction. Various options allow shared access, or row-level locking a transaction. Various options allow shared access, or row-level locking
control. The classic use for this is control. The classic use for this is
@ -112,13 +184,13 @@
</para> </para>
</note> </note>
<REFSECT2 ID="R2-SQL-LOCK-3"> <refsect2 id="R2-SQL-LOCK-3">
<REFSECT2INFO> <refsect2info>
<DATE>1998-09-24</DATE> <date>1998-09-24</date>
</REFSECT2INFO> </refsect2info>
<TITLE> <title>
Notes Notes
</TITLE> </title>
<para> <para>
<command>LOCK</command> is a <productname>Postgres</productname> <command>LOCK</command> is a <productname>Postgres</productname>
language extension. language extension.
@ -134,16 +206,16 @@
</para> </para>
</note> </note>
</para> </para>
</REFSECT2> </refsect2>
</refsect1> </refsect1>
<REFSECT1 ID="R1-SQL-LOCK-2"> <refsect1 id="R1-SQL-LOCK-2">
<TITLE> <title>
Usage Usage
</TITLE> </title>
<PARA> <para>
</PARA> </para>
<ProgramListing> <programlisting>
--Explicit locking to prevent deadlock: --Explicit locking to prevent deadlock:
-- --
BEGIN WORK; BEGIN WORK;
@ -152,30 +224,30 @@
UPDATE films SET len = INTERVAL '100 minute' UPDATE films SET len = INTERVAL '100 minute'
WHERE len = INTERVAL '117 minute'; WHERE len = INTERVAL '117 minute';
COMMIT WORK; COMMIT WORK;
</ProgramListing> </programlisting>
</REFSECT1> </refsect1>
<REFSECT1 ID="R1-SQL-LOCK-3"> <refsect1 id="R1-SQL-LOCK-3">
<TITLE> <title>
Compatibility Compatibility
</TITLE> </title>
<REFSECT2 ID="R2-SQL-LOCK-4"> <refsect2 id="R2-SQL-LOCK-4">
<REFSECT2INFO> <refsect2info>
<DATE>1998-09-24</DATE> <date>1998-09-24</date>
</REFSECT2INFO> </refsect2info>
<TITLE> <title>
SQL92 SQL92
</TITLE> </title>
<PARA> <para>
There is no <command>LOCK TABLE</command> in <acronym>SQL92</acronym>, There is no <command>LOCK TABLE</command> in <acronym>SQL92</acronym>,
which instead uses <command>SET TRANSACTION</command> to specify which instead uses <command>SET TRANSACTION</command> to specify
concurrency level on transactions. We support that too. concurrency level on transactions. We support that too.
</para> </para>
</refsect2> </refsect2>
</refsect1> </refsect1>
</REFENTRY> </refentry>
<!-- Keep this comment at the end of the file <!-- Keep this comment at the end of the file
Local variables: Local variables:

615
doc/src/sgml/ref/set.sgml
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@ -1,42 +1,43 @@
<REFENTRY ID="SQL-SET"> <refentry id="SQL-SET">
<REFMETA> <refmeta>
<REFENTRYTITLE> <refentrytitle>
SET SET
</REFENTRYTITLE> </refentrytitle>
<REFMISCINFO>SQL - Language Statements</REFMISCINFO> <refmiscinfo>SQL - Language Statements</refmiscinfo>
</REFMETA> </refmeta>
<REFNAMEDIV> <refnamediv>
<REFNAME> <refname>
SET SET
</REFNAME> </refname>
<REFPURPOSE> <refpurpose>
Set run-time parameters for session Set run-time parameters for session
</REFPURPOSE> </refpurpose>
</refnamediv> </refnamediv>
<REFSYNOPSISDIV> <refsynopsisdiv>
<REFSYNOPSISDIVINFO> <refsynopsisdivinfo>
<DATE>1998-09-24</DATE> <date>1998-09-24</date>
</REFSYNOPSISDIVINFO> </refsynopsisdivinfo>
<SYNOPSIS> <synopsis>
SET <REPLACEABLE CLASS="PARAMETER">variable</REPLACEABLE> { TO | = } { '<REPLACEABLE CLASS="PARAMETER">value</REPLACEABLE>' | DEFAULT } SET <replaceable class="PARAMETER">variable</replaceable> { TO | = } { '<replaceable class="PARAMETER">value</replaceable>' | DEFAULT }
SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL }; SET TIME ZONE { '<replaceable class="PARAMETER">timezone</replaceable>' | LOCAL | DEFAULT };
</SYNOPSIS> SET TRANSACTION ISOLATION LEVEL { READ COMMITTED | SERIALIZED | DEFAULT }
</synopsis>
<REFSECT2 ID="R2-SQL-SET-1"> <refsect2 id="R2-SQL-SET-1">
<REFSECT2INFO> <refsect2info>
<DATE>1998-09-24</DATE> <date>1998-09-24</date>
</REFSECT2INFO> </refsect2info>
<TITLE> <title>
Inputs Inputs
</TITLE> </title>
<PARA> <para>
<VARIABLELIST> <variablelist>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
<REPLACEABLE CLASS="PARAMETER">variable</REPLACEABLE> <replaceable class="PARAMETER">variable</replaceable>
</TERM> </term>
<LISTITEM> <listitem>
<para> <para>
Settable global parameter. Settable global parameter.
</para> </para>
@ -44,114 +45,152 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</varlistentry> </varlistentry>
<varlistentry> <varlistentry>
<term> <term>
<REPLACEABLE CLASS="PARAMETER">value</REPLACEABLE> <replaceable class="PARAMETER">value</replaceable>
</term> </term>
<listitem> <listitem>
<PARA> <para>
New value of parameter. New value of parameter.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
</variablelist> </variablelist>
</para> </para>
<para> <para>
The possible variables and allowed values are: The possible variables and allowed values are:
<VARIABLELIST> <variablelist>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
DateStyle CLIENT_ENCODING | NAMES
</TERM> </term>
<LISTITEM> <listitem>
<PARA> <para>
Sets the multi-byte client encoding
<VARIABLELIST> <variablelist>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
<replaceable class="parameter">value</replaceable>
</term>
<listitem>
<para>
Sets the multi-byte client encoding to
<replaceable class="parameter">value</replaceable>.
The specified encoding must be supported by the backend.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
DEFAULT
</term>
<listitem>
<para>
Sets the multi-byte client encoding.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
This is only enabled if multi-byte was specified to configure.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
DateStyle
</term>
<listitem>
<para>
<variablelist>
<varlistentry>
<term>
ISO ISO
</TERM> </term>
<LISTITEM> <listitem>
<PARA> <para>
use ISO 8601-style dates and times use ISO 8601-style dates and times
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
SQL SQL
</TERM> </term>
<LISTITEM> <listitem>
<PARA> <para>
use Oracle/Ingres-style dates and times use Oracle/Ingres-style dates and times
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
Postgres Postgres
</TERM> </term>
<LISTITEM> <listitem>
<PARA> <para>
use traditional <productname>Postgres</productname> format use traditional <productname>Postgres</productname> format
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
European European
</TERM> </term>
<LISTITEM> <listitem>
<PARA> <para>
use dd/mm/yyyy for numeric date representations. use dd/mm/yyyy for numeric date representations.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
NonEuropean NonEuropean
</TERM> </term>
<LISTITEM> <listitem>
<PARA> <para>
use mm/dd/yyyy for numeric date representations. use mm/dd/yyyy for numeric date representations.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
German German
</TERM> </term>
<LISTITEM> <listitem>
<PARA> <para>
use dd.mm.yyyy for numeric date representations. use dd.mm.yyyy for numeric date representations.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
US US
</TERM> </term>
<LISTITEM> <listitem>
<PARA> <para>
same as 'NonEuropean' same as 'NonEuropean'
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
default default
</TERM> </term>
<LISTITEM> <listitem>
<PARA> <para>
restores the default values ('US,Postgres') restores the default values ('US,Postgres')
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
</variablelist> </variablelist>
</para> </para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para> <para>
Date format initialization my be done by: Date format initialization my be done by:
<simplelist> <simplelist>
@ -180,10 +219,48 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
int DateStyle = USE_ISO_DATES | USE_POSTGRES_DATES | USE_SQL_DATES | USE_GERMAN_DATES int DateStyle = USE_ISO_DATES | USE_POSTGRES_DATES | USE_SQL_DATES | USE_GERMAN_DATES
</member> </member>
</simplelist> </simplelist>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
SERVER_ENCODING
</term>
<listitem>
<para>
Sets the multi-byte server encoding
<variablelist>
<varlistentry>
<term>
<replaceable class="parameter">value</replaceable>
</term>
<listitem>
<para>
Sets the multi-byte server encoding.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
DEFAULT
</term>
<listitem>
<para>
Sets the multi-byte server encoding.
</para>
</listitem>
</varlistentry>
</variablelist>
</para> </para>
<para> <para>
<variablelist> This is only enabled if multi-byte was specified to configure.
</para>
</listitem>
</varlistentry>
<varlistentry> <varlistentry>
<term> <term>
TIMEZONE TIMEZONE
@ -257,8 +334,59 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
<varlistentry>
<term>
TRANSACTION ISOLATION LEVEL
</term>
<listitem>
<para>
Sets the isolation level for the current transaction.
<variablelist>
<varlistentry>
<term>
READ COMMITTED
</term>
<listitem>
<para>
The current transaction reads only
committed rows. READ COMMITTED is the default.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
SERIALIZABLE
</term>
<listitem>
<para>
The current transaction will place a
lock on every row read, so later reads in that transaction
see the rows unmodified by other transactions.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
DEFAULT
</term>
<listitem>
<para>
Sets the isolation level for the current transaction to
<option>READ COMMITTED</option>.
</para>
</listitem>
</varlistentry>
</variablelist> </variablelist>
</para> </para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para> <para>
There are also several internal or optimization There are also several internal or optimization
parameters which can be specified parameters which can be specified
@ -301,7 +429,9 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
The frontend may be initialized by setting the PGCOSTHEAP The frontend may be initialized by setting the PGCOSTHEAP
environment variable. environment variable.
</para> </para>
<variablelist> </listitem>
</varlistentry>
<varlistentry> <varlistentry>
<term> <term>
COST_INDEX COST_INDEX
@ -309,10 +439,8 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
<listitem> <listitem>
<para> <para>
Sets the default cost of an index scan for use by the optimizer. Sets the default cost of an index scan for use by the optimizer.
</para>
</listitem>
</varlistentry>
<variablelist>
<varlistentry> <varlistentry>
<term> <term>
<replaceable class="parameter">float4</replaceable> <replaceable class="parameter">float4</replaceable>
@ -335,15 +463,15 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</listitem> </listitem>
</varlistentry> </varlistentry>
</variablelist> </variablelist>
</listitem>
</varlistentry>
</variablelist>
</para> </para>
<para> <para>
The frontend may be initialized by setting the PGCOSTINDEX The frontend may be initialized by setting the PGCOSTINDEX
environment variable. environment variable.
</para>
</listitem>
</varlistentry>
<variablelist>
<varlistentry> <varlistentry>
<term> <term>
GEQO GEQO
@ -351,12 +479,11 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
<listitem> <listitem>
<para> <para>
Sets the threshold for using the genetic optimizer algorithm. Sets the threshold for using the genetic optimizer algorithm.
</para>
<variablelist> <variablelist>
<varlistentry> <varlistentry>
<term> <term>
On ON
</term> </term>
<listitem> <listitem>
<para> <para>
@ -367,7 +494,7 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</varlistentry> </varlistentry>
<varlistentry> <varlistentry>
<term> <term>
On=<replaceable class="parameter">#</replaceable> ON=<replaceable class="parameter">#</replaceable>
</term> </term>
<listitem> <listitem>
<para> <para>
@ -379,7 +506,7 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</varlistentry> </varlistentry>
<varlistentry> <varlistentry>
<term> <term>
Off OFF
</term> </term>
<listitem> <listitem>
<para> <para>
@ -393,15 +520,13 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</term> </term>
<listitem> <listitem>
<para> <para>
Equivalent to specifying <command>SET GEQO='on'</command> Equivalent to specifying <command>SET GEQO='ON'</command>
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
</variablelist> </variablelist>
</listitem>
</varlistentry>
</variablelist>
</para> </para>
<para> <para>
This algorithm is on by default, which used GEQO for This algorithm is on by default, which used GEQO for
statements of eleven or more tables. statements of eleven or more tables.
@ -416,8 +541,10 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
It may be useful when joining big relations with It may be useful when joining big relations with
small ones. This algorithm is off by default. small ones. This algorithm is off by default.
It's not used by GEQO anyway. It's not used by GEQO anyway.
</para>
</listitem>
</varlistentry>
<variablelist>
<varlistentry> <varlistentry>
<term> <term>
KSQO KSQO
@ -427,12 +554,11 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
<firstterm>Key Set Query Optimizer</firstterm> forces the query optimizer <firstterm>Key Set Query Optimizer</firstterm> forces the query optimizer
to optimize repetative OR clauses such as generated by to optimize repetative OR clauses such as generated by
<productname>MicroSoft Access</productname>: <productname>MicroSoft Access</productname>:
</para>
<variablelist> <variablelist>
<varlistentry> <varlistentry>
<term> <term>
On ON
</term> </term>
<listitem> <listitem>
<para> <para>
@ -443,7 +569,7 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
<varlistentry> <varlistentry>
<term> <term>
Off OFF
</term> </term>
<listitem> <listitem>
<para> <para>
@ -458,15 +584,13 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</term> </term>
<listitem> <listitem>
<para> <para>
Equivalent to specifying <command>SET KSQO='off'</command>. Equivalent to specifying <command>SET KSQO='OFF'</command>.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
</variablelist> </variablelist>
</listitem>
</varlistentry>
</variablelist>
</para> </para>
<para> <para>
It may be useful when joining big relations with It may be useful when joining big relations with
small ones. This algorithm is off by default. small ones. This algorithm is off by default.
@ -475,28 +599,21 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
<para> <para>
The frontend may be initialized by setting the PGKSQO The frontend may be initialized by setting the PGKSQO
environment variable. environment variable.
<variablelist> </para>
</listitem>
</varlistentry>
<varlistentry> <varlistentry>
<term> <term>
QUERY_LIMIT QUERY_LIMIT
</term> </term>
<listitem> <listitem>
<para> <para>
Sets the number of rows returned by a query. Sets the maximum number of rows returned by a query.
</para> By default, there is no limit to the number of rows
returned by a query.
<variablelist> <variablelist>
<varlistentry>
<term>
Value
</term>
<listitem>
<para>
Maximum number of rows to return for a query. The default is to allow
an unlimited number of rows.
</para>
</listitem>
</varlistentry>
<varlistentry> <varlistentry>
<term> <term>
<replaceable class="parameter">#</replaceable> <replaceable class="parameter">#</replaceable>
@ -519,181 +636,61 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</listitem> </listitem>
</varlistentry> </varlistentry>
</variablelist> </variablelist>
<para>
By default, there is no limit to the number of rows
returned by a query.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
</variablelist>
<variablelist>
<varlistentry>
<term>
TRANSACTION ISOLATION LEVEL
</term>
<listitem>
<para>
Sets the isolation level for the current transaction.
<variablelist>
<varlistentry>
<term>
<replaceable class="parameter">value</replaceable>
</term>
<listitem>
<para>
Sets the isolation level for the current transaction to
'SERIALIZABLE' or 'READ COMMITTED'.
SERIALIZABLE means that the current transaction will place a
lock on every row read, so later reads in that transaction
see the rows unmodified by other transactions.
READ COMMITTED means that the current transaction reads only
committed rows. READ COMMITTED is the default.
</para>
</listitem>
</varlistentry>
</para>
<varlistentry>
<term>
DEFAULT
</term>
<listitem>
<para>
Sets the isolation level for the current transaction to
'READ COMMITTED'.
</para>
</listitem>
</varlistentry>
</variablelist> </variablelist>
</para> </para>
</refsect2>
<variablelist> <refsect2 id="R2-SQL-SET-2">
<varlistentry> <refsect2info>
<term> <date>1998-09-24</date>
CLIENT_ENCODING | NAMES </refsect2info>
</term> <title>
<listitem>
<para>
Sets the multi-byte client encoding
<variablelist>
<varlistentry>
<term>
<replaceable class="parameter">value</replaceable>
</term>
<listitem>
<para>
Sets the multi-byte client encoding.
</para>
</listitem>
</varlistentry>
</para>
<varlistentry>
<term>
DEFAULT
</term>
<listitem>
<para>
Sets the multi-byte client encoding.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
This is only enabled if multi-byte was specified to configure.
</para>
<variablelist>
<varlistentry>
<term>
SERVER_ENCODING
</term>
<listitem>
<para>
Sets the multi-byte server encoding
<variablelist>
<varlistentry>
<term>
<replaceable class="parameter">value</replaceable>
</term>
<listitem>
<para>
Sets the multi-byte server encoding.
</para>
</listitem>
</varlistentry>
</para>
<varlistentry>
<term>
DEFAULT
</term>
<listitem>
<para>
Sets the multi-byte server encoding.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
This is only enabled if multi-byte was specified to configure.
</para>
</REFSECT2>
<REFSECT2 ID="R2-SQL-SET-2">
<REFSECT2INFO>
<DATE>1998-09-24</DATE>
</REFSECT2INFO>
<TITLE>
Outputs Outputs
</TITLE> </title>
<PARA> <para>
<VARIABLELIST> <variablelist>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
<returnvalue>SET VARIABLE</returnvalue> <returnvalue>SET VARIABLE</returnvalue>
</TERM> </term>
<LISTITEM> <listitem>
<PARA> <para>
Message returned if successfully. Message returned if successfully.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
<VARLISTENTRY> <varlistentry>
<TERM> <term>
<returnvalue>WARN: Bad value for <replaceable class="parameter">variable</replaceable> (<replaceable class="parameter">value</replaceable>)</returnvalue> <returnvalue>WARN: Bad value for
</TERM> <replaceable class="parameter">variable</replaceable>
<LISTITEM> (<replaceable class="parameter">value</replaceable>)</returnvalue>
<PARA> </term>
If the command fails to set variable. <listitem>
<para>
If the command fails to set the specified variable.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>
</VARIABLELIST> </variablelist>
</para> </para>
</REFSECT2> </refsect2>
</REFSYNOPSISDIV> </refsynopsisdiv>
<REFSECT1 ID="R1-SQL-SET-1"> <refsect1 id="R1-SQL-SET-1">
<REFSECT1INFO> <refsect1info>
<DATE>1998-09-24</DATE> <date>1998-09-24</date>
</REFSECT1INFO> </refsect1info>
<TITLE> <title>
Description Description
</TITLE> </title>
<PARA> <para>
<command>SET</command> will modify configuration parameters for variable during <command>SET</command> will modify configuration parameters for variable during
a session. a session.
</para> </para>
@ -707,20 +704,20 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
<para> <para>
<command>SET TIME ZONE</command> changes the session's <command>SET TIME ZONE</command> changes the session's
default time zone offset. default time zone offset.
A SQL-session always begins with an initial default time zone An SQL-session always begins with an initial default time zone
offset. offset.
The <command>SET TIME ZONE</command> statement is used to change the default The <command>SET TIME ZONE</command> statement is used to change the default
time zone offset for the current SQL session. time zone offset for the current SQL session.
</para> </para>
<REFSECT2 ID="R2-SQL-SET-3"> <refsect2 id="R2-SQL-SET-3">
<REFSECT2INFO> <refsect2info>
<DATE>1998-09-24</DATE> <date>1998-09-24</date>
</REFSECT2INFO> </refsect2info>
<TITLE> <title>
Notes Notes
</TITLE> </title>
<PARA> <para>
The <command>SET <replaceable class="parameter">variable</replaceable></command> The <command>SET <replaceable class="parameter">variable</replaceable></command>
statement is a <productname>Postgres</productname> language extension. statement is a <productname>Postgres</productname> language extension.
</para> </para>
@ -728,16 +725,16 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
Refer to <command>SHOW</command> and <command>RESET</command> to Refer to <command>SHOW</command> and <command>RESET</command> to
display or reset the current values. display or reset the current values.
</para> </para>
</REFSECT2> </refsect2>
</REFSECT1> </refsect1>
<REFSECT1 ID="R1-SQL-SET-2"> <refsect1 id="R1-SQL-SET-2">
<TITLE> <title>
Usage Usage
</TITLE> </title>
<PARA> <para>
</PARA> </para>
<ProgramListing> <programlisting>
--Set the style of date to ISO: --Set the style of date to ISO:
-- --
SET DATESTYLE TO 'ISO'; SET DATESTYLE TO 'ISO';
@ -771,25 +768,25 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
today today
---------------------- ----------------------
1998-03-31 17:41:31+02 1998-03-31 17:41:31+02
</ProgramListing> </programlisting>
</REFSECT1> </refsect1>
<REFSECT1 ID="R1-SQL-SET-3"> <refsect1 id="R1-SQL-SET-3">
<TITLE> <title>
Compatibility Compatibility
</TITLE> </title>
<PARA> <para>
</PARA> </para>
<REFSECT2 ID="R2-SQL-SET-4"> <refsect2 id="R2-SQL-SET-4">
<REFSECT2INFO> <refsect2info>
<DATE>1998-09-24</DATE> <date>1998-09-24</date>
</REFSECT2INFO> </refsect2info>
<TITLE> <title>
SQL92 SQL92
</TITLE> </title>
<PARA> <para>
There is no There is no
<command>SET <replaceable class="parameter">variable</replaceable></command> <command>SET <replaceable class="parameter">variable</replaceable></command>
in <acronym>SQL92</acronym>. in <acronym>SQL92</acronym>.
@ -804,7 +801,7 @@ SET TIME ZONE { '<REPLACEABLE CLASS="PARAMETER">timezone</REPLACEABLE>' | LOCAL
</para> </para>
</refsect2> </refsect2>
</refsect1> </refsect1>
</REFENTRY> </refentry>
<!-- Keep this comment at the end of the file <!-- Keep this comment at the end of the file
Local variables: Local variables: