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><H1
><A
NAME="SQL-REFRESHMATERIALIZEDVIEW"
></A
>REFRESH MATERIALIZED VIEW</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN79307"
></A
><H2
>Name</H2
>REFRESH MATERIALIZED VIEW -- replace the contents of a materialized view</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN79312"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>REFRESH MATERIALIZED VIEW <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
>
[ WITH [ NO ] DATA ]</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN79315"
></A
><H2
>Description</H2
><P
> <TT
CLASS="COMMAND"
>REFRESH MATERIALIZED VIEW</TT
> completely replaces the
contents of a materialized view. The old contents are discarded. If
<TT
CLASS="LITERAL"
>WITH DATA</TT
> is specified (or defaults) the backing query
is executed to provide the new data, and the materialized view is left in a
scannable state. If <TT
CLASS="LITERAL"
>WITH NO DATA</TT
> is specified no new
data is generated and the materialized view is left in an unscannable
state.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN79321"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
></DT
><DD
><P
> The name (optionally schema-qualified) of the materialized view to
refresh.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN79329"
></A
><H2
>Notes</H2
><P
> While the default index for future
<A
HREF="sql-cluster.html"
>CLUSTER</A
>
operations is retained, <TT
CLASS="COMMAND"
>REFRESH MATERIALIZED VIEW</TT
> does not
order the generated rows based on this property. If you want the data
to be ordered upon generation, you must use an <TT
CLASS="LITERAL"
>ORDER BY</TT
>
clause in the backing query.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN79335"
></A
><H2
>Examples</H2
><P
> This command will replace the contents of the materialized view called
<TT
CLASS="LITERAL"
>order_summary</TT
> using the query from the materialized
view's definition, and leave it in a scannable state:
</P><PRE
CLASS="PROGRAMLISTING"
>REFRESH MATERIALIZED VIEW order_summary;</PRE
><P>
</P
><P
> This command will free storage associated with the materialized view
<TT
CLASS="LITERAL"
>annual_statistics_basis</TT
> and leave it in an unscannable
state:
</P><PRE
CLASS="PROGRAMLISTING"
>REFRESH MATERIALIZED VIEW annual_statistics_basis WITH NO DATA;</PRE
><P></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN79343"
></A
><H2
>Compatibility</H2
><P
> <TT
CLASS="COMMAND"
>REFRESH MATERIALIZED VIEW</TT
> is a
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> extension.
</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN79348"
></A
><H2
>See Also</H2
><A
HREF="sql-creatematerializedview.html"
>CREATE MATERIALIZED VIEW</A
>, <A
HREF="sql-altermaterializedview.html"
>ALTER MATERIALIZED VIEW</A
>, <A
HREF="sql-dropmaterializedview.html"
>DROP MATERIALIZED VIEW</A
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