Several views, such asDBA_MVIEW_DETAIL_PARTITION, detail which partitions are stale or fresh. Oracle does not rewrite against partial stale materialized views if partition change tracking on the changed table is
materialized view in oracle A materialized view is a database object that contains the results of a query. They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table's data. Materialized views, which store data based on remote tables...
but if you refresh the materialized view, thenthese changes are not pushed back to the master and the changes are lost in thematerialized view itself. Writeable materialized views are typically
ORA-23515 错误表明在尝试删除表空间时,Oracle 数据库检测到该表空间中还有物化视图(Materialized Views)和/或其索引存在。物化视图是预计算并存储查询结果的数据库对象,它们通常用于提高复杂查询的性能。由于物化视图和它们的索引占用表空间,因此在删除表空间之前,必须首先处理这些对象。 2. 提供解决ORA-23515错误的一般...
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...
by AWS Team on 07 3月 2025 in Database Permalink Share 背景介绍 很多企业的 Amazon RDS for Oracle(以下简称 RDS Oracle)数据库在多年持续运行之后,其存储卷会显著增大。而随着历史数据的归档,大量记录被清理之后实例中的有效数据可能变得很少。遗憾的是 RDS 存储卷不支持就地缩小容量,这意味...
Oracle can optimize a query that selects from the source of your materialized view in such a way that it instead reads from your materialized view. In situations where you create materialized views as forms of aggregate tables, or as copies of frequently executed queries, this can greatly speed...
With AWS DMS, you can create and manage materialized views in Oracle and PostgreSQL databases to improve query performance and enable efficient data access. A materialized view is a database object that stores a pre-computed result set from a query, providing fast access...
By including CUBE andROLLUP in a Materialized View along with other GROUP BY results, more complete information is available for reduced- cost queries. Those present will learn how to create and use Materialized Views and how to use CUBE and ROLLUP tocreate more complete summaries.John Jay King...
Materialized Views pre-compute and store the results of a database query that can optionally Comparing Materialized Views and Analytic Workspaces in Oracle Database 11g Page 3 involve a join, an aggregation or both. Like an index, a materialized view requires space in addition to that required ...