NAME

       REFRESH_MATERIALIZED_VIEW - replace the contents of a materialized view

SYNOPSIS

       REFRESH MATERIALIZED VIEW [ CONCURRENTLY ] name
           [ WITH [ NO ] DATA ]

DESCRIPTION

       REFRESH MATERIALIZED VIEW 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 WITH DATA 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 WITH NO
       DATA is specified no new data is generated and the materialized view is left in an
       unscannable state.

       CONCURRENTLY and WITH NO DATA may not be specified together.

PARAMETERS

       CONCURRENTLY
           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.

           This option is only allowed if there is at least one UNIQUE 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 WHERE clause.

           This option may not be used when the materialized view is not already populated.

           Even with this option only one REFRESH at a time may run against any one materialized
           view.

       name
           The name (optionally schema-qualified) of the materialized view to refresh.

NOTES

       While the default index for future CLUSTER(7) operations is retained, REFRESH MATERIALIZED
       VIEW does not order the generated rows based on this property. If you want the data to be
       ordered upon generation, you must use an ORDER BY clause in the backing query.

EXAMPLES

       This command will replace the contents of the materialized view called order_summary using
       the query from the materialized view's definition, and leave it in a scannable state:

           REFRESH MATERIALIZED VIEW order_summary;

       This command will free storage associated with the materialized view
       annual_statistics_basis and leave it in an unscannable state:

           REFRESH MATERIALIZED VIEW annual_statistics_basis WITH NO DATA;

COMPATIBILITY

       REFRESH MATERIALIZED VIEW is a PostgreSQL extension.

SEE ALSO

       CREATE MATERIALIZED VIEW (CREATE_MATERIALIZED_VIEW(7)), ALTER MATERIALIZED VIEW
       (ALTER_MATERIALIZED_VIEW(7)), DROP MATERIALIZED VIEW (DROP_MATERIALIZED_VIEW(7))