Usage

Syntax

• Create an fast-refresh materialized view.

  CREATE INCREMENTAL MATERIALIZED VIEW [ view_name ] AS { query_block }; 

• Fully refresh a materialized view.

  REFRESH MATERIALIZED VIEW [ view_name ];

• Incrementally refresh a materialized view.

  REFRESH INCREMENTAL MATERIALIZED VIEW [ view_name ];

• Delete a materialized view.

  DROP MATERIALIZED VIEW [ view_name ];

• Query a materialized view.

  SELECT * FROM [ view_name ];

Examples

-- Prepare data.
openGauss=# CREATE TABLE t1(c1 int, c2 int);
openGauss=# INSERT INTO t1 VALUES(1, 1);
openGauss=# INSERT INTO t1 VALUES(2, 2);

-- Create an fast-refresh materialized view.
openGauss=# CREATE INCREMENTAL MATERIALIZED VIEW mv AS SELECT * FROM t1;
CREATE MATERIALIZED VIEW

-- Insert data.
openGauss=# INSERT INTO t1 VALUES(3, 3);
INSERT 0 1

-- Incrementally refresh the materialized view.
openGauss=# REFRESH INCREMENTAL MATERIALIZED VIEW mv;
REFRESH MATERIALIZED VIEW

-- Query the materialized view result.
openGauss=# SELECT * FROM mv;
 c1 | c2 
----+----
  1 |  1
  2 |  2
  3 |  3
(3 rows)

-- Insert data.
openGauss=# INSERT INTO t1 VALUES(4, 4);
INSERT 0 1

-- Fully refresh the materialized view.
openGauss=# REFRESH MATERIALIZED VIEW mv;
REFRESH MATERIALIZED VIEW

-- Query the materialized view result.
openGauss=# select * from mv;
 c1 | c2 
----+----
  1 |  1
  2 |  2
  3 |  3
  4 |  4
(4 rows)

-- Delete the materialized view.
openGauss=# DROP MATERIALIZED VIEW mv;
DROP MATERIALIZED VIEW