简介: 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...
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 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...
Created a Materialized View in ORACLE which won't refresh Ask Question Asked 4 years, 10 months ago Modified 2 months ago Viewed 1k times Report this ad1 I created a materialized view log along with a materialized view called update_nboe based on table NBOE_ EMPLOYEES_TEST using the follo...
In data warehouses, materialized views normally contain aggregates. TheDWA_tables in the defaultOracle Communications Data Modelare this type of materialized view. For a materialized view with aggregates, for fast refresh to be possible: TheSELECTlist must contain all of theGROUP BYcolumns (if pr...
A materialized view in Oracle is a combination of a structure to hold the data (a table), a job that refreshes the data (a job), and a process that figures out how to refresh the data based on the specified query. This process would generally involve the creation and maintenance of mat...
1 getting Oracle materialized view to refresh 0 Refresh in Materialized Views 4 How to refresh materialized view using trigger? 7 Materialized View: How to automatically refresh it upon table data changes? 4 Refreshing an existing materialized View 2 Oracle: Materialized view refresh is not ...
FORCE(默认) Oracle在刷新时会去判断是否可以进行快速刷新,如果可以则采用Fast方式,否则采用Complete的方式,Force选项是默认选项 ON DEMAND(默认) 实体化视图在用户需要的时候进行刷新,可以手工通过 DBMS_MVIEW.REFRESH等方法来进行刷新,也可以通过JOB定时进行刷新 ...
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 ...