postgres=# CREATE MATERIALIZED VIEW mvfoo AS SELECT * FROM foo; 创建刷新物化视图的触发器函数 postgres=# CREATE OR REPLACE FUNCTION tri_foo_func() RETURNS TRIGGER AS $$ BEGIN REFRESH MATERIALIZED VIEW mvfoo; RETURN NULL; END; $$ LANGUAGE plpgsql; 由于我们将要创建的是一个AFTER触发器, 所以函数...
Once you run REFRESH MATERIALIZED VIEW, we’ll end up with the new data in our materialized view, like so:The thing is, REFRESHing a view can be expensive, and to understand why we should understand a bit more about how they work and why they get out of date....
REFRESH MATERIALIZED VIEW <物化视图名称>; 代码语言:txt 复制 其中,<物化视图名称>是你要刷新的物化视图的名称。 刷新完成后,可以使用以下命令退出Postgres命令行界面: 代码语言:txt 复制 \q 代码语言:txt 复制 或者直接关闭命令行界面。 物化视图是一种预先计算和存储查询结果的技术,可以提高查询性能。在某些...
kingledb=# \help refresh materializedviewCommand: REFRESH MATERIALIZEDVIEWDescription:replacethe contentsofa materializedviewSyntax: REFRESH MATERIALIZEDVIEW[CONCURRENTLY]name[WITH [ NO]DATA ] 刷新物化视图 refresh MATERIALIZEDVIEWteacher_Mwithno data;--查询--SELECT*fromteacher_M>ERROR: materializedview"teach...
createorreplacefunctiontri_tableName_mview_func()returnstriggeras$$declarebeginrefresh materializedviewconcurrently tableName_mviewwithdata;returnnull;end; $$languageplpgsql;createtriggertri_tableName_idu afterinsertorupdateordeleteontableNameforeachstatementexecuteproceduretri_tableName_mview_func(); ...
物化视图既然是一个实实在在存在的表,它就需要有数据填充过程,数据填充的命令是REFRESH MATERIALIZED VIEW AI检测代码解析 master=> \h REFRESH Command: REFRESH MATERIALIZED VIEW Description: replace the contents of a materialized view Syntax: REFRESH MATERIALIZED VIEW [ CONCURRENTLY ] name ...
master=> \h REFRESHCommand: REFRESH MATERIALIZED VIEWDescription: replace the contents of a materialized viewSyntax:REFRESH MATERIALIZED VIEW name [ WITH [ NO ] DATA ] 这里就引入说postgres的更新数据库有两种方式,一种是全量更新,一种是增量更新,增量更新是在REFRESH的时候增加一个CONCURRENTLY参数。而增量...
REFRESH MATERIALIZED VIEW recent_product_sales; In addition to building the materialized view, Postgres will have to rebuild the index from scratch. Depending on data size, this can be a pretty long operation. Concurrent (non-locking) refresh This refresh will update the materialized view without...
我在Windows7上使用pgAdminIIIv1.22.1连接到红帽上的PostgreSQL服务器9.4.8版本。当物化视图完成刷新后,我就可以通过pgAdmin登录了。完成REFRESH MATERIALIZED VIEW my_view后,将运行上述查询, 浏览0提问于2016-05-31得票数1 1回答 为什么pgAdminIII无法连接到Postgres?
由REFRESH MATERIALIZED VIEW CONCURRENTLY获得。 ACCESS EXCLUSIVE 与所有模式的锁冲突(ACCESS SHARE、ROW SHARE、ROW EXCLUSIVE、SHARE UPDATE EXCLUSIVE、SHARE、SHARE ROW EXCLUSIVE、EXCLUSIVE和ACCESS EXCLUSIVE)。这种模式保证持有者是访问该表的唯一事务。 由ALTER TABLE、DROP TABLE、TRUNCATE、REINDEX、CLUSTER、VACUUM ...