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+<!--
+doc/src/sgml/ref/alter_tablespace.sgml
+PostgreSQL documentation
+-->
+
+<refentry id="sql-altertablespace">
+ <indexterm zone="sql-altertablespace">
+  <primary>ALTER TABLESPACE</primary>
+ </indexterm>
+
+ <refmeta>
+  <refentrytitle>ALTER TABLESPACE</refentrytitle>
+  <manvolnum>7</manvolnum>
+  <refmiscinfo>SQL - Language Statements</refmiscinfo>
+ </refmeta>
+
+ <refnamediv>
+  <refname>ALTER TABLESPACE</refname>
+  <refpurpose>change the definition of a tablespace</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+<synopsis>
+ALTER TABLESPACE <replaceable>name</replaceable> RENAME TO <replaceable>new_name</replaceable>
+ALTER TABLESPACE <replaceable>name</replaceable> OWNER TO { <replaceable>new_owner</replaceable> | CURRENT_USER | SESSION_USER }
+ALTER TABLESPACE <replaceable>name</replaceable> SET ( <replaceable class="parameter">tablespace_option</replaceable> = <replaceable class="parameter">value</replaceable> [, ... ] )
+ALTER TABLESPACE <replaceable>name</replaceable> RESET ( <replaceable class="parameter">tablespace_option</replaceable> [, ... ] )
+</synopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+  <title>Description</title>
+
+  <para>
+   <command>ALTER TABLESPACE</command> can be used to change the definition of
+   a tablespace.
+  </para>
+
+  <para>
+   You must own the tablespace to change the definition of a tablespace.
+   To alter the owner, you must also be a direct or indirect member of the new
+   owning role.
+   (Note that superusers have these privileges automatically.)
+  </para>
+
+ </refsect1>
+
+ <refsect1>
+  <title>Parameters</title>
+
+  <variablelist>
+   <varlistentry>
+    <term><replaceable class="parameter">name</replaceable></term>
+    <listitem>
+     <para>
+      The name of an existing tablespace.
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><replaceable class="parameter">new_name</replaceable></term>
+    <listitem>
+     <para>
+      The new name of the tablespace.  The new name cannot
+      begin with <literal>pg_</literal>, as such names
+      are reserved for system tablespaces.
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><replaceable class="parameter">new_owner</replaceable></term>
+    <listitem>
+     <para>
+      The new owner of the tablespace.
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><replaceable class="parameter">tablespace_option</replaceable></term>
+    <listitem>
+     <para>
+      A tablespace parameter to be set or reset.  Currently, the only
+      available parameters are <varname>seq_page_cost</varname>,
+      <varname>random_page_cost</varname>, <varname>effective_io_concurrency</varname>
+      and <varname>maintenance_io_concurrency</varname>.
+      Setting these values for a particular tablespace will override the
+      planner's usual estimate of the cost of reading pages from tables in
+      that tablespace, and the executor's prefetching behavior, as established
+      by the configuration parameters of the
+      same name (see <xref linkend="guc-seq-page-cost"/>,
+      <xref linkend="guc-random-page-cost"/>,
+      <xref linkend="guc-effective-io-concurrency"/>,
+      <xref linkend="guc-maintenance-io-concurrency"/>).  This may be useful if
+      one tablespace is located on a disk which is faster or slower than the
+      remainder of the I/O subsystem.
+     </para>
+    </listitem>
+   </varlistentry>
+
+  </variablelist>
+ </refsect1>
+
+ <refsect1>
+  <title>Examples</title>
+
+  <para>
+   Rename tablespace <literal>index_space</literal> to <literal>fast_raid</literal>:
+<programlisting>
+ALTER TABLESPACE index_space RENAME TO fast_raid;
+</programlisting>
+  </para>
+
+  <para>
+   Change the owner of tablespace <literal>index_space</literal>:
+<programlisting>
+ALTER TABLESPACE index_space OWNER TO mary;
+</programlisting></para>
+ </refsect1>
+
+ <refsect1>
+  <title>Compatibility</title>
+
+  <para>
+   There is no <command>ALTER TABLESPACE</command> statement in
+   the SQL standard.
+  </para>
+ </refsect1>
+
+ <refsect1>
+  <title>See Also</title>
+
+  <simplelist type="inline">
+   <member><xref linkend="sql-createtablespace"/></member>
+   <member><xref linkend="sql-droptablespace"/></member>
+  </simplelist>
+ </refsect1>
+</refentry>