database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-08-30 06:01:21 +03:00
Code Activity

Separated set constraints and set transaction reference pages, revised set

Browse Source 
reference page to new configuration system. Big update to administrator's
guide, chapters Runtime environment, Client authentication, and User
management, the latter two were part of the old Security chapter.
This commit is contained in:
Peter Eisentraut
2000-06-18 21:24:54 +00:00
parent b4e906f191
commit 2c0edb3c86
19 changed files with 2259 additions and 3186 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
doc/src/sgml/ref/set_constraints.sgml Normal file
View File

@@ -0,0 +1,53 @@
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/ref/set_constraints.sgml,v 1.1 2000/06/18 21:24:54 petere Exp $ -->
<refentry id="SQL-SET-CONSTRAINTS">
<refmeta>
<refentrytitle id="SQL-SET-CONSTRAINTS-title">SET CONSTRAINTS</refentrytitle>
<refmiscinfo>SQL - Language Statements</refmiscinfo>
</refmeta>
<refnamediv>
<refname>SET CONSTRAINTS</refname>
<refpurpose>Set the constraint mode of the current SQL-transaction</refpurpose>
</refnamediv>
<refsynopsisdiv>
<refsynopsisdivinfo>
<date>2000-06-01</date>
</refsynopsisdivinfo>
<synopsis>
SET CONSTRAINTS { ALL | <replaceable class="parameter">constraint</replaceable> [, ...] } { DEFERRED | IMMEDIATE }
</synopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para>
<command>SET CONSTRAINTS</command> sets the behavior of constraint
evaluation in the current transaction. In
<option>IMMEDIATE</option> mode, constraints are checked at the end
of each statement. In <option>DEFERRED</option> mode, constraints
are not checked until transaction commit.
</para>
<para>
Upon creation, a constraint is always give one of three
characteristics: <option>INITIALLY DEFERRED</option>,
<option>INITIALLY IMMEDIATE DEFERRABLE</option>, or
<option>INITIALLY IMMEDIATE NOT DEFERRABLE</option>. The third
class is not affected by the <command>SET CONSTRAINTS</command>
command.
</para>
<para>
Currently, only foreign key constraints are affected by this
setting. Check and unique constraints are always effectively
initially immediate not deferrable.
</para>
</refsect1>
<refsect1>
<title>Compatibility</title>
<para>
SQL92, SQL99
</para>
</refsect1>
</refentry>