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<!--
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 } 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 all of the objects in the current database which
are owned by the user out of a given 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.)
Users may use ALTER TABLESPACE ... MOVE to move either ALL of their objects,
or just TABLES, INDEXES, or MATERIALIZED VIEWS, but they must have CREATE
rights on the new tablespace and only objects, directly or indirectly, owned
by the user will 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">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>
|
