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 ...
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...
drop materialized view log on test_table; --删除物化视图日志: 1. drop materialized view mv_materialized_test; --删除物化视图 1. 物化视图刷新 使用dbms_mview.refresh 手工刷新 EXEC DBMS_MVIEW.REFRESH('mv_emp_rowid'); --完全刷新 EXEC DBMS_MVIEW.REFRESH(LIST => 'mv_emp_rowid',METHOD => ...
When a materialized view is fast refreshed, Oracle must examine all of the changes to the master table or master materialized view since the last refresh to see if any apply to the materialized view. Therefore, if any changes where made to the master since the last refresh, then a materiali...
通过案例学调优之--跨库建立物化视图(Materialized View) 应用环境: 操作系统: RedHat EL55 Oracle: Oracle 10gR2 一、物化视图概述 在复制环境下,创建的物化视图通常情况下主键,rowid和子查询视图。 物化视图由于是物理真实存在的,故可以创建索引。 二、物化视图刷新 ...
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 ...
Oracle: Oracle 10gR2 一、物化视图概述 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。物化视图存储基于远程表的数据,也可以称为快照。 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结果,这样,在执行查询时,就可以避免进行这些耗...
Materialized view logs must be present on all tables referenced in the query that defines the materialized view. The valid aggregate functions are:SUM,COUNT(x),COUNT(*),AVG,VARIANCE,STDDEV,MIN, andMAX, and the expression to be aggregated can be any SQL value expression. ...
sql SELECT owner, mview_name FROM dba_mviews WHERE tablespace_name = 'YOUR_TABLESPACE_NAME'; 然后,使用 DROP MATERIALIZED VIEW 语句删除这些物化视图: sql DROP MATERIALIZED VIEW owner.mview_name; 删除物化视图索引:物化视图通常会有索引,这些索引也需要被删除。可以使用以下 SQL 查询来查找表空间中的...
SQL 语法普通租户(Oracle 模式)SQL 语句 DDL CREATE MATERIALIZED VIEW LOG CREATE MATERIALIZED VIEW LOG 更新时间:2025-03-01 23:00:01 编辑 分享 描述 该语句用来创建物化视图日志。 物化视图日志(Materialized View Log,mlog)用于记录基表(普通表或物化视图)的增量更新数据,以支持物化视图的快速刷新功能。mlog ...