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 Repl
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 you create a materialized view, Oracle Database creates one internal table and at least one index, and may create one view, all in the schema of the materialized view. Oracle Database uses these objects to maintain the materialized view data. You must have the privileges necessary to cr...
我们将对这些活跃表创建 materialized view log,以实现首次全量数据加载,后续增量刷新的功能,而其它“静态表”及对象则在停机窗口中借助数据泵导入。步骤如下: 源– 统计有效数据为创建新 RDS Oracle 实例作参考 目标 – 创建新实例,创建表空间 目标 – 导入活跃表(metadata only) 源– 给活跃表创...
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 ...
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 ...
ALTER MATERIALIZED VIEW LOG scott.emp STORAGE (NEXT 50K);Remove the materialized view log associated with scott's emp table from the database:DROP MATERIALIZED ... Get Oracle SQL: the Essential Reference now with the O’Reilly learning platform. O’Reilly members experience books, live events,...
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...