创建物化视图需要有 CREATE TABLE 权限。更多有关 OceanBase 数据库权限的详细介绍,请参见 Oracle 模式下的权限分类。语法CREATE MATERIALIZED VIEW view_name [column_list] [table_option_list] [partition_option] [refresh_clause] AS view_select_stmt; column_list: (column_name [, column_name ...]) ...
In the past, organizations using summaries spent a significant amount of time and effort creating summaries manually, identifying which summaries to create, indexing the summaries, updating them, and advising their users on which ones to use. With the advent of materialized views, a database admini...
complex queries. *Action:Reissue the command with the REFRESH FORCE or REFRESH COMPLETE option or create a simple materialized view. 数据库版本: BANNER --- Oracle Database 11g Enterprise EditionRelease 11.2.0.1.0 - 64bit Production PL/SQL Release 11.2.0.1.0 - Production CORE11.2.0.1.0Productio...
Materialized Views may be refreshed in the same manner used for Snapshots allowing summarization to occur with a frequency that meets the needs of the user community. By including CUBE andROLLUP in a Materialized View along with other GROUP BY results, more complete information is available for ...
在Oracle数据库中,哪个后台进程刷新物化视图(materialized views)? A 答案 答案:Oracle数据库使用Job Queue进程去运行用户的Jobs,经常在批量模式下。任务是用户自定义的预订运行一次或者多次的作业。比如说,可以使用一个Job队列去安排在后台运行的一个长时间运行的更新任务。给定一个开始时间和间隔时间,任务队列进程就会...
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.com blog Written by Dmitri Korotkevitch "Indexed views" 2011...
Although in Oracle Database 11g, analytic workspaces can now also take advantage of materialized views and query rewrite. Firstly we need to get a better appreciation of these two features within the database. Throughout the white paper, it is assumed that the reader is familiar with data ...
Oracle Database uses these objects to maintain the materialized view data. You must have the privileges necessary to create these objects. You can create the following types of local materialized views (including both ON COMMIT and ON DEMAND) on master tables with commit SCN-based materialized ...
oracleoracle10gmaterialized-views 4 我有一个非常大的物化视图需要调整。这次只是一个简单的调整,我只需在选择语句中添加一个NVL函数。 例如,原始代码... Select this, that... 即改动 Select NVL(this, orThat) as this, NVL(That, orThis) as that 查询需要26秒才能运行,但由于检索到的行数太多(...
oracle objects - Materialized views and Synonyms 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 * fromdba_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...