aterialized views are disk based and update periodically base upon the query definition. Views are virtual only and run the query definition each time they are accessed. Views evaluate the data in the tables underlying the view definition at the time…

Materialized Views 物化视图 -基础篇 http://blog.csdn.net/elimago/article/details/5404019…

Materialized views - 物化视图,不实时查询表,定期更新,查询速度快 视图的更新频率我们可以在这看到:select * from dba_jobs , 一般在创建视图的时候完成的. 也可以在 sql developer的scheduler里查看: Synonyms  - 别名,有些时候可以用于dblink查询其他数据库的表来定义成本地表名一样 CREATE OR REPLACE PUBLIC SYNONYM "XXX" FOR "<SCHEMA>…

Thanks to MS sql could have materialized views ,similar with oracle MVs, using indexed views. what is going on ? are they same thing ? Here we go : (1) general demo tables and rows /****************************************************AboutSQLServer.c…

List all of MV inoracle: select owner, query, query_len from dba_mviews See content of aMV: select *from dba_mviewswhere owner='CNTL_DATA' A materialized viewis a database object that contains the results of a query. For example, it maybe a local cop…

One characteristic of time-series data workloads is that the dataset will grow very quickly. Without the proper data infrastructure, these large data volumes can cause slowdowns in primarily two areas: inserting the data into the database, and aggreg…

Django的View(视图)简介 一个视图函数(类),简称视图,是一个简单的Python 函数(类),它接受Web请求并且返回Web响应. 响应可以是一张网页的HTML内容,一个重定向,一个404错误,一个XML文档,或者一张图片. 无论视图本身包含什么逻辑,都要返回响应.代码写在哪里也无所谓,只要它在你当前项目目录下面.除此之外没有更多的要求了——可以说“没有什么神奇的地方”.为了将代码放在某处,大家约定成俗将视图放置在项目(project)或应用程序(app)目录中的名为views.py的…

在ORACLE数据库中,表与表之间的SQL JOIN方式有多种(不仅表与表,还可以表与视图.物化视图等联结),官方的解释如下所示 A join is a query that combines rows from two or more tables, views, or materialized views. Oracle Database performs a join whenever multiple tables appear in the FROM clause of the que…

还在整理中.... EXPDP/IMPDP 相关文档:Utilities 2 Data Pump Export 3 Data Pump Import SQL*Loader 相关文档:Utilities 7 SQL*Loader Command-Line Reference 8 SQL*Loader Control File Reference 生成外部表加载文件: 文档:7 SQL*Loader Command-Line Reference 外部表泄载: Utilities第14 The ORA…

ORACLE的SQL JOIN方式大全 在ORACLE数据库中,表与表之间的SQL JOIN方式有多种(不仅表与表,还可以表与视图.物化视图等联结),官方的解释如下所示 A join is a query that combines rows from two or more tables, views, or materialized views. Oracle Database performs a join whenever multiple tables appear in the FR…