<!--
doc/src/sgml/ref/alter_tablespace.sgml
PostgreSQL documentation
-->

<refentry id="SQL-ALTERTABLESPACE">
 <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 or affect objects of a tablespace</refpurpose>
 </refnamediv>

 <indexterm zone="sql-altertablespace">
  <primary>ALTER TABLESPACE</primary>
 </indexterm>

 <refsynopsisdiv>
<synopsis>
ALTER TABLESPACE <replaceable>name</replaceable> RENAME TO <replaceable>new_name</replaceable>
ALTER TABLESPACE <replaceable>name</replaceable> OWNER TO <replaceable>new_owner</replaceable>
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> [, ... ] )
ALTER TABLESPACE <replaceable>name</replaceable> MOVE { ALL | TABLES | INDEXES | MATERIALIZED VIEWS } [ OWNED BY <replaceable class="PARAMETER">role_name</replaceable> [, ...] ] TO <replaceable>new_tablespace</replaceable> [ NOWAIT ]
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>ALTER TABLESPACE</command> can be used to change the definition of
   a tablespace or to migrate objects in the current database between
   tablespaces.
  </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.)

   Users may use ALTER TABLESPACE ... MOVE to move objects between tablespaces.
   ALL will move all tables, indexes and materialized views while specifying
   TABLES will move only tables (but not their indexes), INDEXES will only move
   indexes (including those underneath materialized views, but not tables) and
   MATERIALIZED VIEWS will only move the table relation of the materialized
   view (but no indexes associated with it).  Users may also specify a list of
   roles whose objects are to be moved using OWNED BY.

   Users must have CREATE rights on the new tablespace and be considered an
   owner (either directly or indirectly) on all objects to be moved.  Note that
   the superuser is considered an owner of all objects and therefore an
   ALTER TABLESPACE ... MOVE ALL issued by the superuser will move all objects
   in the current database which are in the tablespace.

   All objects to be moved will be locked immediately by the command.  The
   NOWAIT option, if specified, will cause the command to fail if it is unable
   to acquire the locks.

   System catalogs will not be moved by this command- individuals wishing to
   move a whole database should use ALTER DATABASE, or call ALTER TABLE on the
   individual system catalogs.  Note that relations in <literal>information_schema</literal>
   will be moved, just as any other normal database objects, if the user is the
   superuser or considered an owner of the relations in <literal>information_schema</literal>.
  </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</> and
      <varname>random_page_cost</>.  Setting either value for a particular
      tablespace will override the planner's usual estimate of the cost of
      reading pages from tables in that tablespace, as established by
      the configuration parameters of the same name (see
      <xref linkend="guc-seq-page-cost">,
      <xref linkend="guc-random-page-cost">).  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>

   <varlistentry>
    <term><replaceable class="parameter">role_name</replaceable></term>
    <listitem>
     <para>
      Role(s) whose objects are to be moved.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">new_tablespace</replaceable></term>
    <listitem>
     <para>
      The name of the tablespace to move objects into.  The user must have
      CREATE rights on the new tablespace to move objects into that
      tablespace, unless the tablespace being moved into is the default
      tablespace for the database connected to.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">NOWAIT</replaceable></term>
    <listitem>
     <para>
      The NOWAIT option causes the ALTER TABLESPACE command to fail immediately
      if it is unable to acquire the necessary lock on all of the objects being
      move.
     </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>

  <para>
   Move all of the objects which I own from the default tablespace to
   the <literal>fast_raid</literal> tablespace:
<programlisting>
ALTER TABLESPACE pg_default MOVE ALL TO fast_raid;
</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>
