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In the continuing saga of FE/BE protocol revisions, add reporting of

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initial values and runtime changes in selected parameters.  This gets
rid of the need for an initial 'select pg_client_encoding()' query in
libpq, bringing us back to one message transmitted in each direction
for a standard connection startup.  To allow server version to be sent
using the same GUC mechanism that handles other parameters, invent the
concept of a never-settable GUC parameter: you can 'show server_version'
but it's not settable by any GUC input source.  Create 'lc_collate' and
'lc_ctype' never-settable parameters so that people can find out these
settings without need for pg_controldata.  (These side ideas were all
discussed some time ago in pgsql-hackers, but not yet implemented.)
This commit is contained in:
Tom Lane
2003-04-25 19:45:10 +00:00
parent a2190c9eb6
commit 9cbaf72177
13 changed files with 412 additions and 478 deletions
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30
doc/src/sgml/ref/set.sgml
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@@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/ref/set.sgml,v 1.73 2003/03/25 16:15:44 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/ref/set.sgml,v 1.74 2003/04/25 19:45:08 tgl Exp $
PostgreSQL documentation
-->
@@ -52,7 +52,7 @@ SET [ SESSION | LOCAL ] TIME ZONE { <replaceable class="PARAMETER">timezone</rep
<term><replaceable class="PARAMETER">variable</replaceable></term>
<listitem>
<para>
A settable run-time parameter.
Name of a settable run-time parameter.
</para>
</listitem>
</varlistentry>
@@ -79,8 +79,9 @@ SET [ SESSION | LOCAL ] TIME ZONE { <replaceable class="PARAMETER">timezone</rep
<para>
The <command>SET</command> command changes run-time configuration
parameters. Many of the run-time parameters listed in the
<xref linkend="runtime-config"> can be changed on-the-fly with <command>SET</command>.
parameters. Many of the run-time parameters listed in
<xref linkend="runtime-config"> can be changed on-the-fly with
<command>SET</command>.
(But some require superuser privileges to change, and others cannot
be changed after server or session start.) Note that
<command>SET</command> only affects the value used by the current
@@ -123,7 +124,7 @@ SET [ SESSION | LOCAL ] TIME ZONE { <replaceable class="PARAMETER">timezone</rep
<listitem>
<para>
Choose the date/time representation style. Two separate
settings are involved: the default date/time output and the
settings are involved: the default date/time output format and the
interpretation of ambiguous input.
</para>
@@ -147,7 +148,7 @@ SET [ SESSION | LOCAL ] TIME ZONE { <replaceable class="PARAMETER">timezone</rep
<para>
Use Oracle/Ingres-style dates and times. Note that this
style has nothing to do with SQL (which mandates ISO 8601
style), the naming of this option is a historical accident.
style); the naming of this option is a historical accident.
</para>
</listitem>
</varlistentry>
@@ -283,17 +284,6 @@ SELECT setseed(<replaceable>value</replaceable>);
</listitem>
</varlistentry>
<varlistentry>
<term>SERVER_ENCODING</term>
<listitem>
<para>
Shows the server-side multibyte encoding. (At present, this
parameter can be shown but not set, because the encoding is
determined at <application>initdb</> time.)
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>TIME ZONE</term>
<term>TIMEZONE</term>
@@ -410,7 +400,7 @@ SELECT setseed(<replaceable>value</replaceable>);
</varlistentry>
<varlistentry>
<term><computeroutput>ERROR: '<replaceable>name</replaceable> is not a
<term><computeroutput>ERROR: '<replaceable>name</replaceable>' is not a
valid option name</computeroutput></term>
<listitem>
<para>
@@ -447,7 +437,7 @@ SELECT setseed(<replaceable>value</replaceable>);
<title>Notes</title>
<para>
The function <function>set_config</function> provides the equivalent
The function <function>set_config</function> provides equivalent
capability. See <xref linkend="functions-misc">.
</para>
</refsect1>
@@ -517,6 +507,8 @@ SELECT CURRENT_TIMESTAMP AS today;
<title>See Also</title>
<simpara>
<xref linkend="SQL-SHOW" endterm="SQL-SHOW-title">,
<xref linkend="SQL-RESET" endterm="SQL-RESET-title">,
<xref linkend="sql-set-constraints" endterm="sql-set-constraints-title">,
<xref linkend="sql-set-session-authorization" endterm="sql-set-session-authorization-title">,
<xref linkend="sql-set-transaction" endterm="sql-set-transaction-title">