When a materializedview is fast refreshed, Oracle must examine all of the changes to the mastertable or master materialized view since the last refresh to see if any apply tothe materialized view. Therefore, if any changes were made to the master sincethe last refresh, then a materialized vie...
Oracle通过一个物化视图日志还可以支持多个物化视图的快速刷新。 物化视图日志根据不同物化视图的快速刷新的需要,可以建立为ROWID或PRIMARY KEY类型的。还可以选择是否包括SEQUENCE、INCLUDING NEW VALUES以及指定列的列表。 三、创建物化视图命令 create materialized view [view_name] refresh [fast|complete|force] [...
For replication purposes, materialized views allow you to maintain copies of remote data on your local node. These copies are read-only. If you want to update the local copies, you have to use the Advanced Replication feature. You can select data from a materialized view as you would from ...
If the materialized view has remote tables in theFROMclause, all tables in theFROMclause must be located on that same site. Further,ON COMMITrefresh is not supported for materialized view with remote tables. Except for SCN-based materialized view logs, materialized view logs must be present on ...
Oracle-Materialized View解读 物化视图概述 物化视图(Materialized View)在9i以前的版本叫做快照(SNAPSHOT),从9i开始改名叫做物化视图。 Oracle的物化视图是包括一个查询结果的数据库对像,它是远程数据的的本地副本,或者用来生成基于数据表求和的汇总表。 物化视图可以用于预先计算并保存表连接或聚集等耗时较多的操作的...
Example syntax tocreate a materialized view in oracle: CREATEMATERIALIZEDVIEWMV_MY_VIEW 1. REFRESH FASTSTARTWITHSYSDATE 1. NEXTSYSDATE+1 1. ASSELECT*FROM; 1. 1. Oracle usesmaterialized views to replicate data to non-master sites in a replication environmentand to cache expensive queries in a ...
以上是Oracle创建物化视图(Materialized View,以下简称MV)时的常用语法,各参数的含义如下: 1.refresh [fast|complete|force] 视图刷新的方式: fast: 增量刷新.假设前一次刷新的时间为t1,那么使用fast模式刷新物化视图时,只向视图中添加t1到当前时间段内,主表变化过的数据.为了记录这种变化, 建立增量刷新物化视图还需...
/rdbms/admin/utlxmv.sqlin sqlplus grant execute on dbms_mview to {your_user}as sys executecall dbms_mview.explain_mview('{query or mview name}'); and thenselect * from MV_CAPABILITIES_TABLE For last 2 steps I use my own script:https://github.com/xtender/xt_scripts/blob/master/m...
Luckily Oracle Database has an in-built option to do this automatically: materialized views (MVs). Module 2 Create Summaries with Materialized Views Unlike a regular view, an MV stores the result of its query. When you access the MV it reads these saved data. This creates an MV counting...
If you're working with SQL Developer, you have to put the dbms_view in lowercase. The rest compiled fine for me although I haven't called the procedure from code yet. CREATE OR REPLACE PROCEDURE "MAT_VIEW_FOO_TBL" AS BEGIN dbms_mview.refresh('v_materialized_foo_tbl'); END; Share ...