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'\" t
.\" Title: REFRESH MATERIALIZED VIEW
.\" Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\" Date: 2023
.\" Manual: PostgreSQL 15.5 Documentation
.\" Source: PostgreSQL 15.5
.\" Language: English
.\"
.TH "REFRESH MATERIALIZED VIEW" "7" "2023" "PostgreSQL 15.5" "PostgreSQL 15.5 Documentation"
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.nh
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.SH "NAME"
REFRESH_MATERIALIZED_VIEW \- replace the contents of a materialized view
.SH "SYNOPSIS"
.sp
.nf
REFRESH MATERIALIZED VIEW [ CONCURRENTLY ] \fIname\fR
[ WITH [ NO ] DATA ]
.fi
.SH "DESCRIPTION"
.PP
\fBREFRESH MATERIALIZED VIEW\fR
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\&.
.PP
CONCURRENTLY
and
WITH NO DATA
may not be specified together\&.
.SH "PARAMETERS"
.PP
CONCURRENTLY
.RS 4
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\&.
.sp
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\&.
.sp
This option may not be used when the materialized view is not already populated\&.
.sp
Even with this option only one
REFRESH
at a time may run against any one materialized view\&.
.RE
.PP
\fIname\fR
.RS 4
The name (optionally schema\-qualified) of the materialized view to refresh\&.
.RE
.SH "NOTES"
.PP
If there is an
ORDER BY
clause in the materialized view\*(Aqs defining query, the original contents of the materialized view will be ordered that way; but
\fBREFRESH MATERIALIZED VIEW\fR
does not guarantee to preserve that ordering\&.
.SH "EXAMPLES"
.PP
This command will replace the contents of the materialized view called
order_summary
using the query from the materialized view\*(Aqs definition, and leave it in a scannable state:
.sp
.if n \{\
.RS 4
.\}
.nf
REFRESH MATERIALIZED VIEW order_summary;
.fi
.if n \{\
.RE
.\}
.PP
This command will free storage associated with the materialized view
annual_statistics_basis
and leave it in an unscannable state:
.sp
.if n \{\
.RS 4
.\}
.nf
REFRESH MATERIALIZED VIEW annual_statistics_basis WITH NO DATA;
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP
\fBREFRESH MATERIALIZED VIEW\fR
is a
PostgreSQL
extension\&.
.SH "SEE ALSO"
CREATE MATERIALIZED VIEW (\fBCREATE_MATERIALIZED_VIEW\fR(7)), ALTER MATERIALIZED VIEW (\fBALTER_MATERIALIZED_VIEW\fR(7)), DROP MATERIALIZED VIEW (\fBDROP_MATERIALIZED_VIEW\fR(7))
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