使用
语法格式
创建增量物化视图
CREATE INCREMENTAL MATERIALIZED VIEW [ view_name ] AS { query_block };
全量刷新物化视图
REFRESH MATERIALIZED VIEW [ view_name ];
增量刷新物化视图
REFRESH INCREMENTAL MATERIALIZED VIEW [ view_name ];
删除物化视图
DROP MATERIALIZED VIEW [ view_name ];
查询物化视图
SELECT * FROM [ view_name ];
示例
--准备数据。
CREATE TABLE t1(c1 int, c2 int);
INSERT INTO t1 VALUES(1, 1);
INSERT INTO t1 VALUES(2, 2);
--创建增量物化视图。
openGauss=# CREATE INCREMENTAL MATERIALIZED VIEW mv AS SELECT * FROM t1;
CREATE MATERIALIZED VIEW
--插入数据。
openGauss=# INSERT INTO t1 VALUES(3, 3);
INSERT 0 1
--增量刷新物化视图。
openGauss=# REFRESH INCREMENTAL MATERIALIZED VIEW mv;
REFRESH MATERIALIZED VIEW
--查询物化视图结果。
openGauss=# SELECT * FROM mv;
c1 | c2
----+----
1 | 1
2 | 2
3 | 3
(3 rows)
--插入数据。
openGauss=# INSERT INTO t1 VALUES(4, 4);
INSERT 0 1
--全量刷新物化视图。
openGauss=# REFRESH MATERIALIZED VIEW mv;
REFRESH MATERIALIZED VIEW
--查询物化视图结果。
openGauss=# select * from mv;
c1 | c2
----+----
1 | 1
2 | 2
3 | 3
4 | 4
(4 rows)
--删除物化视图。
openGauss=# DROP MATERIALIZED VIEW mv;
DROP MATERIALIZED VIEW