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><H1
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NAME="SQL-ALTERTABLESPACE"
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>ALTER TABLESPACE</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN65427"
></A
><H2
>Name</H2
>ALTER TABLESPACE -- change the definition of a tablespace</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN65432"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ALTER TABLESPACE <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> RENAME TO <TT
CLASS="REPLACEABLE"
><I
>new_name</I
></TT
>
ALTER TABLESPACE <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> OWNER TO <TT
CLASS="REPLACEABLE"
><I
>new_owner</I
></TT
>
ALTER TABLESPACE <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> SET ( <TT
CLASS="REPLACEABLE"
><I
>tablespace_option</I
></TT
> = <TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
> [, ... ] )
ALTER TABLESPACE <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> RESET ( <TT
CLASS="REPLACEABLE"
><I
>tablespace_option</I
></TT
> [, ... ] )</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN65443"
></A
><H2
>Description</H2
><P
> <TT
CLASS="COMMAND"
>ALTER TABLESPACE</TT
> changes the definition of
a tablespace.
</P
><P
> You must own the tablespace to use <TT
CLASS="COMMAND"
>ALTER TABLESPACE</TT
>.
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.)
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN65449"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
></DT
><DD
><P
> The name of an existing tablespace.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_name</I
></TT
></DT
><DD
><P
> The new name of the tablespace. The new name cannot
begin with <TT
CLASS="LITERAL"
>pg_</TT
>, as such names
are reserved for system tablespaces.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_owner</I
></TT
></DT
><DD
><P
> The new owner of the tablespace.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>tablespace_parameter</I
></TT
></DT
><DD
><P
> A tablespace parameter to be set or reset. Currently, the only
available parameters are <TT
CLASS="VARNAME"
>seq_page_cost</TT
> and
<TT
CLASS="VARNAME"
>random_page_cost</TT
>. 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
<A
HREF="runtime-config-query.html#GUC-SEQ-PAGE-COST"
>seq_page_cost</A
>,
<A
HREF="runtime-config-query.html#GUC-RANDOM-PAGE-COST"
>random_page_cost</A
>). 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.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN65477"
></A
><H2
>Examples</H2
><P
> Rename tablespace <TT
CLASS="LITERAL"
>index_space</TT
> to <TT
CLASS="LITERAL"
>fast_raid</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER TABLESPACE index_space RENAME TO fast_raid;</PRE
><P>
</P
><P
> Change the owner of tablespace <TT
CLASS="LITERAL"
>index_space</TT
>:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER TABLESPACE index_space OWNER TO mary;</PRE
><P></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN65486"
></A
><H2
>Compatibility</H2
><P
> There is no <TT
CLASS="COMMAND"
>ALTER TABLESPACE</TT
> statement in
the SQL standard.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN65490"
></A
><H2
>See Also</H2
><A
HREF="sql-createtablespace.html"
>CREATE TABLESPACE</A
>, <A
HREF="sql-droptablespace.html"
>DROP TABLESPACE</A
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