REFRESH MATERIALIZED VIEW(7)
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. 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 index on any expressions nor 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))
PostgreSQL 9.4.15 2017 REFRESH MATERIALIZED VIEW(7)
PostgreSQL 9.4.15 - Generated Tue Nov 28 15:01:57 CST 2017