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><H1
><A
NAME="SQL-REFRESHMATERIALIZEDVIEW"
></A
>REFRESH MATERIALIZED VIEW</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN90294"
></A
><H2
>Name</H2
>REFRESH MATERIALIZED VIEW&nbsp;--&nbsp;replace the contents of a materialized view</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN90297"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>REFRESH MATERIALIZED VIEW [ CONCURRENTLY ] <TT
CLASS="REPLACEABLE"
><I
>name</I
></TT
>
    [ WITH [ NO ] DATA ]</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN90300"
></A
><H2
>Description</H2
><P
>   <TT
CLASS="COMMAND"
>REFRESH MATERIALIZED VIEW</TT
> completely replaces the
   contents of a materialized view.  To execute this command you must be the
   owner of the 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
><P
>   <TT
CLASS="LITERAL"
>CONCURRENTLY</TT
> and <TT
CLASS="LITERAL"
>WITH NO DATA</TT
> may not
   be specified together.
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN90309"
></A
><H2
>Parameters</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>CONCURRENTLY</TT
></DT
><DD
><P
>      Refresh the materialized view without locking out concurrent selects on
      the materialized view.  Without this option a refresh which affects a
      lot of rows will tend to use fewer resources and complete more quickly,
      but could block other connections which are trying to read from the
      materialized view.  This option may be faster in cases where a small
      number of rows are affected.
     </P
><P
>      This option is only allowed if there is at least one
      <TT
CLASS="LITERAL"
>UNIQUE</TT
> index on the materialized view which uses only
      column names and includes all rows;  that is, it must not be an
      expression index or include a <TT
CLASS="LITERAL"
>WHERE</TT
> clause.
     </P
><P
>      This option may not be used when the materialized view is not already
      populated.
     </P
><P
>      Even with this option only one <TT
CLASS="LITERAL"
>REFRESH</TT
> at a time may
      run against any one materialized view.
     </P
></DD
><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="AEN90328"
></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="AEN90334"
></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="AEN90342"
></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="AEN90347"
></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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