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><H1
><A
NAME="SQL-ALTERINDEX"
></A
>ALTER INDEX</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN74548"
></A
><H2
>Name</H2
>ALTER INDEX -- change the definition of an index</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN74551"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>ALTER INDEX [ IF EXISTS ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> RENAME TO <TT
CLASS="REPLACEABLE"
><I
>new_name</I
></TT
>
ALTER INDEX [ IF EXISTS ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> SET TABLESPACE <TT
CLASS="REPLACEABLE"
><I
>tablespace_name</I
></TT
>
ALTER INDEX <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> DEPENDS ON EXTENSION <TT
CLASS="REPLACEABLE"
><I
>extension_name</I
></TT
>
ALTER INDEX [ IF EXISTS ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> SET ( <TT
CLASS="REPLACEABLE"
><I
>storage_parameter</I
></TT
> [= <TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>] [, ... ] )
ALTER INDEX [ IF EXISTS ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> RESET ( <TT
CLASS="REPLACEABLE"
><I
>storage_parameter</I
></TT
> [, ... ] )
ALTER INDEX ALL IN TABLESPACE <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
> [ OWNED BY <TT
CLASS="REPLACEABLE"
><I
>role_name</I
></TT
> [, ... ] ]
SET TABLESPACE <TT
CLASS="REPLACEABLE"
><I
>new_tablespace</I
></TT
> [ NOWAIT ]</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74567"
></A
><H2
>Description</H2
><P
> <TT
CLASS="COMMAND"
>ALTER INDEX</TT
> changes the definition of an existing index.
There are several subforms:
<P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>RENAME</TT
></DT
><DD
><P
> The <TT
CLASS="LITERAL"
>RENAME</TT
> form changes the name of the index.
There is no effect on the stored data.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>SET TABLESPACE</TT
></DT
><DD
><P
> This form changes the index's tablespace to the specified tablespace and
moves the data file(s) associated with the index to the new tablespace.
To change the tablespace of an index, you must own the index and have
<TT
CLASS="LITERAL"
>CREATE</TT
> privilege on the new tablespace.
All indexes in the current database in a tablespace can be moved by using
the <TT
CLASS="LITERAL"
>ALL IN TABLESPACE</TT
> form, which will lock all
indexes to be moved and then move each one. This form also supports
<TT
CLASS="LITERAL"
>OWNED BY</TT
>, which will only move indexes owned by the
roles specified. If the <TT
CLASS="LITERAL"
>NOWAIT</TT
> option is specified
then the command will fail if it is unable to acquire all of the locks
required immediately. Note that system catalogs will not be moved by
this command, use <TT
CLASS="COMMAND"
>ALTER DATABASE</TT
> or explicit
<TT
CLASS="COMMAND"
>ALTER INDEX</TT
> invocations instead if desired.
See also
<A
HREF="sql-createtablespace.html"
>CREATE TABLESPACE</A
>.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>DEPENDS ON EXTENSION</TT
></DT
><DD
><P
> This form marks the index as dependent on the extension, such that if the
extension is dropped, the index will automatically be dropped as well.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>SET ( <TT
CLASS="REPLACEABLE"
><I
>storage_parameter</I
></TT
> [= <TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
>] [, ... ] )</TT
></DT
><DD
><P
> This form changes one or more index-method-specific storage parameters
for the index. See
<A
HREF="sql-createindex.html"
>CREATE INDEX</A
>
for details on the available parameters. Note that the index contents
will not be modified immediately by this command; depending on the
parameter you might need to rebuild the index with
<A
HREF="sql-reindex.html"
>REINDEX</A
>
to get the desired effects.
</P
></DD
><DT
><TT
CLASS="LITERAL"
>RESET ( <TT
CLASS="REPLACEABLE"
><I
>storage_parameter</I
></TT
> [, ... ] )</TT
></DT
><DD
><P
> This form resets one or more index-method-specific storage parameters to
their defaults. As with <TT
CLASS="LITERAL"
>SET</TT
>, a <TT
CLASS="LITERAL"
>REINDEX</TT
>
might be needed to update the index entirely.
</P
></DD
></DL
></DIV
><P>
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74612"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>IF EXISTS</TT
></DT
><DD
><P
> Do not throw an error if the index does not exist. A notice is issued
in this case.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
></DT
><DD
><P
> The name (possibly schema-qualified) of an existing index to
alter.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>new_name</I
></TT
></DT
><DD
><P
> The new name for the index.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>tablespace_name</I
></TT
></DT
><DD
><P
> The tablespace to which the index will be moved.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>extension_name</I
></TT
></DT
><DD
><P
> The name of the extension that the index is to depend on.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>storage_parameter</I
></TT
></DT
><DD
><P
> The name of an index-method-specific storage parameter.
</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
>value</I
></TT
></DT
><DD
><P
> The new value for an index-method-specific storage parameter.
This might be a number or a word depending on the parameter.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74650"
></A
><H2
>Notes</H2
><P
> These operations are also possible using
<A
HREF="sql-altertable.html"
>ALTER TABLE</A
>.
<TT
CLASS="COMMAND"
>ALTER INDEX</TT
> is in fact just an alias for the forms
of <TT
CLASS="COMMAND"
>ALTER TABLE</TT
> that apply to indexes.
</P
><P
> There was formerly an <TT
CLASS="COMMAND"
>ALTER INDEX OWNER</TT
> variant, but
this is now ignored (with a warning). An index cannot have an owner
different from its table's owner. Changing the table's owner
automatically changes the index as well.
</P
><P
> Changing any part of a system catalog index is not permitted.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74659"
></A
><H2
>Examples</H2
><P
> To rename an existing index:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER INDEX distributors RENAME TO suppliers;</PRE
><P>
</P
><P
> To move an index to a different tablespace:
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER INDEX distributors SET TABLESPACE fasttablespace;</PRE
><P>
</P
><P
> To change an index's fill factor (assuming that the index method
supports it):
</P><PRE
CLASS="PROGRAMLISTING"
>ALTER INDEX distributors SET (fillfactor = 75);
REINDEX INDEX distributors;</PRE
><P></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74667"
></A
><H2
>Compatibility</H2
><P
> <TT
CLASS="COMMAND"
>ALTER INDEX</TT
> is a <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>
extension.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN74672"
></A
><H2
>See Also</H2
><A
HREF="sql-createindex.html"
>CREATE INDEX</A
>, <A
HREF="sql-reindex.html"
>REINDEX</A
></DIV
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