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Standard English uses "may", "can", and "might" in different ways:
may - permission, "You may borrow my rake."
can - ability, "I can lift that log."
might - possibility, "It might rain today."
Unfortunately, in conversational English, their use is often mixed, as
in, "You may use this variable to do X", when in fact, "can" is a better
choice. Similarly, "It may crash" is better stated, "It might crash".
146 lines
4.2 KiB
Plaintext
146 lines
4.2 KiB
Plaintext
<!--
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$PostgreSQL: pgsql/doc/src/sgml/ref/create_tablespace.sgml,v 1.8 2007/01/31 23:26:03 momjian Exp $
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PostgreSQL documentation
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-->
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<refentry id="SQL-CREATETABLESPACE">
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<refmeta>
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<refentrytitle id="sql-createtablespace-title">CREATE TABLESPACE</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>CREATE TABLESPACE</refname>
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<refpurpose>define a new tablespace</refpurpose>
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</refnamediv>
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<indexterm zone="sql-createtablespace">
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<primary>CREATE TABLESPACE</primary>
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</indexterm>
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<refsynopsisdiv>
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<synopsis>
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CREATE TABLESPACE <replaceable class="parameter">tablespacename</replaceable> [ OWNER <replaceable class="parameter">username</replaceable> ] LOCATION '<replaceable class="parameter">directory</replaceable>'
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</synopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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<command>CREATE TABLESPACE</command> registers a new cluster-wide
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tablespace. The tablespace name must be distinct from the name of any
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existing tablespace in the database cluster.
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</para>
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<para>
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A tablespace allows superusers to define an alternative location on
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the file system where the data files containing database objects
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(such as tables and indexes) can reside.
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</para>
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<para>
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A user with appropriate privileges can pass
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<replaceable class="parameter">tablespacename</> to
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<command>CREATE DATABASE</>, <command>CREATE TABLE</>,
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<command>CREATE INDEX</> or <command>ADD CONSTRAINT</> to have the data
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files for these objects stored within the specified tablespace.
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</para>
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</refsect1>
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<refsect1>
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<title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><replaceable class="parameter">tablespacename</replaceable></term>
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<listitem>
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<para>
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The name of a tablespace to be created. The name cannot
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begin with <literal>pg_</literal>, as such names
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are reserved for system tablespaces.
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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><replaceable class="parameter">username</replaceable></term>
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<listitem>
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<para>
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The name of the user who will own the tablespace. If omitted,
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defaults to the user executing the command. Only superusers
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can create tablespaces, but they can assign ownership of tablespaces
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to non-superusers.
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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><replaceable class="parameter">directory</replaceable></term>
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<listitem>
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<para>
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The directory that will be used for the tablespace. The directory
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must be empty and must be owned by the
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<productname>PostgreSQL</> system user. The directory must be
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specified by an absolute path name.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>
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Tablespaces are only supported on systems that support symbolic links.
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</para>
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<para>
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<command>CREATE TABLESPACE</> cannot be executed inside a transaction
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block.
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</para>
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>
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Create a tablespace <literal>dbspace</> at <literal>/data/dbs</>:
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<programlisting>
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CREATE TABLESPACE dbspace LOCATION '/data/dbs';
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</programlisting>
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</para>
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<para>
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Create a tablespace <literal>indexspace</> at <literal>/data/indexes</>
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owned by user <literal>genevieve</>:
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<programlisting>
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CREATE TABLESPACE indexspace OWNER genevieve LOCATION '/data/indexes';
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</programlisting>
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</para>
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</refsect1>
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<refsect1>
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<title>Compatibility</title>
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<para>
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<command>CREATE TABLESPACE</command> is a <productname>PostgreSQL</>
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extension.
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</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<simplelist type="inline">
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<member><xref linkend="sql-createdatabase" endterm="sql-createdatabase-title"></member>
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<member><xref linkend="sql-createtable" endterm="sql-createtable-title"></member>
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<member><xref linkend="sql-createindex" endterm="sql-createindex-title"></member>
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<member><xref linkend="sql-droptablespace" endterm="sql-droptablespace-title"></member>
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<member><xref linkend="sql-altertablespace" endterm="sql-altertablespace-title"></member>
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</simplelist>
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</refsect1>
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</refentry>
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