141 lines
4.1 KiB
Plaintext
141 lines
4.1 KiB
Plaintext
<!--
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doc/src/sgml/ref/alter_tablespace.sgml
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PostgreSQL documentation
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-->
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<refentry id="sql-altertablespace">
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<indexterm zone="sql-altertablespace">
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<primary>ALTER TABLESPACE</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>ALTER TABLESPACE</refentrytitle>
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<manvolnum>7</manvolnum>
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<refmiscinfo>SQL - Language Statements</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>ALTER TABLESPACE</refname>
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<refpurpose>change the definition of a tablespace</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<synopsis>
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ALTER TABLESPACE <replaceable>name</replaceable> RENAME TO <replaceable>new_name</replaceable>
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ALTER TABLESPACE <replaceable>name</replaceable> OWNER TO { <replaceable>new_owner</replaceable> | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
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ALTER TABLESPACE <replaceable>name</replaceable> SET ( <replaceable class="parameter">tablespace_option</replaceable> = <replaceable class="parameter">value</replaceable> [, ... ] )
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ALTER TABLESPACE <replaceable>name</replaceable> RESET ( <replaceable class="parameter">tablespace_option</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>ALTER TABLESPACE</command> can be used to change the definition of
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a tablespace.
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</para>
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<para>
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You must own the tablespace to change the definition of a tablespace.
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To alter the owner, you must also be able to <literal>SET ROLE</literal>
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to the new owning role.
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(Note that superusers have these privileges automatically.)
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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">name</replaceable></term>
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<listitem>
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<para>
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The name of an existing tablespace.
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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">new_name</replaceable></term>
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<listitem>
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<para>
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The new name of the tablespace. The new 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">new_owner</replaceable></term>
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<listitem>
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<para>
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The new owner of the tablespace.
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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">tablespace_option</replaceable></term>
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<listitem>
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<para>
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A tablespace parameter to be set or reset. Currently, the only
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available parameters are <varname>seq_page_cost</varname>,
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<varname>random_page_cost</varname>, <varname>effective_io_concurrency</varname>
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and <varname>maintenance_io_concurrency</varname>.
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Setting these values for a particular tablespace will override the
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planner's usual estimate of the cost of reading pages from tables in
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that tablespace, and the executor's prefetching behavior, as established
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by the configuration parameters of the
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same name (see <xref linkend="guc-seq-page-cost"/>,
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<xref linkend="guc-random-page-cost"/>,
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<xref linkend="guc-effective-io-concurrency"/>,
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<xref linkend="guc-maintenance-io-concurrency"/>). This may be useful if
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one tablespace is located on a disk which is faster or slower than the
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remainder of the I/O subsystem.
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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>Examples</title>
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<para>
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Rename tablespace <literal>index_space</literal> to <literal>fast_raid</literal>:
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<programlisting>
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ALTER TABLESPACE index_space RENAME TO fast_raid;
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</programlisting>
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</para>
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<para>
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Change the owner of tablespace <literal>index_space</literal>:
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<programlisting>
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ALTER TABLESPACE index_space OWNER TO mary;
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</programlisting></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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There is no <command>ALTER TABLESPACE</command> statement in
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the SQL standard.
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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-createtablespace"/></member>
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<member><xref linkend="sql-droptablespace"/></member>
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</simplelist>
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</refsect1>
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</refentry>
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