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doc/src/sgml/ref/alter_tablespace.sgml
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PostgreSQL documentation
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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>
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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 or to migrate objects in the current database between
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tablespaces.
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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 a direct or indirect member of the new
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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</> and
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<varname>random_page_cost</>. Setting either value for a particular
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tablespace will override the planner's usual estimate of the cost of
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reading pages from tables in that tablespace, as established by
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the configuration parameters of the same name (see
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<xref linkend="guc-seq-page-cost">,
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<xref linkend="guc-random-page-cost">). This may be useful if one
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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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