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  • Mysql 物化视图

    2020-10-12 11:20:47
    myql最新的8.0不支持物化视图

    myql不支持物化视图.MySQL要使用物化视图则需要安装flexviews插件; 

    插件地址:https://sourceforge.net/projects/flexviews/ 

    下载不了,Flexviews 是 Swanhart-Tools 的一部分。

    Swanhart-Tools  下载地址:https://github.com/greenlion/swanhart-tools

    Flexviews 使用手册: http://greenlion.github.io/swanhart-tools/flexviews/manual.html

    Flexviews 安装指南: https://github.com/greenlion/swanhart-tools/blob/master/flexviews/INSTALL

     

    其中安装指南上这样说

    Installation:
    
     * set up FlexCDC 
     * cd consumer
     * cp consumer.ini.example consumer.ini
     * MODIFY consumer.ini appropriately!
     * php consumer/setup.php
       :: BINARY LOGGING MUST BE ENABLED
       :: SERVER_ID MUST BE SET
       :: BINLOG_FORMAT=ROW IS REQUIRED
    
     * if no errors, then proceed
    
     * run the consumer (there is a PHP file provided)
     * sh consumer_safe.sh --ini=consumer.ini & 
    
     * You must leave the consumer running at all times!
    
     * Connect to MySQL as the 'root' user (or any user with SUPER privilege)
    
     * Source the install.sql file
       \. install.sql
    

    需要在Linux环境下安装 php.  我的mysql是阿里云mysql(rds),无法实现。

    展开全文
  • How to create a materialized view in mysql ?I am not able to create a materialized view as we do in MS SQL Server.Could anyone let me know the ways to create it in mysql.解决方案You can create a non-...

    How to create a materialized view in mysql ?

    I am not able to create a materialized view as we do in MS SQL Server.

    Could anyone let me know the ways to create it in mysql.

    解决方案

    You can create a non-updateable dynamic view - and if you've got (indexed) timestamps in the underlying table(s) you can add in a snapshot, something like:

    CREATE VIEW almost_materialzd

    AS

    SELECT snp.*

    FROM snapshot snp

    WHERE s.id NOT IN (SELECT id

    FROM source_data sd

    INNER JOIN ref_data rd

    ON rd.value='snapshot of source_data'

    AND sd.update_timestamp>rd.timetamp)

    UNION

    SELECT *

    FROM source_data sd2

    INNER JOIN ref_data rd2

    ON rd2.value='snapshot of source_data'

    AND sd2.update_timestamp>rd2.timetamp);

    But a better solution is to add a trigger (or triggers) to the the underlying table(s) to re-populate the relevant rows in a table representing the materialized view when the underlying tables are changed.

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  • How to implement Materialized ...If not, how can I implement Materialized View with MySQL?Update:Would the following work? This doesn't occur in a transaction, is that a problem?DROP TABLE IF EXIST...

    How to implement Materialized Views?

    If not, how can I implement Materialized View with MySQL?

    Update:

    Would the following work? This doesn't occur in a transaction, is that a problem?

    DROP TABLE IF EXISTS `myDatabase`.`myMaterializedView`;

    CREATE TABLE `myDatabase`.`myMaterializedView` SELECT * from `myDatabase`.`myRegularView`;

    解决方案

    I maintain a project called Flexviews (http://github.com/greenlion/swanhart-tools) which adds incrementally refreshable materialized views to MySQL (aka fast refresh), even for views that use joins and aggregation. I've been working on this project for three years. It includes a change data capture utility to read the database logs. No triggers are used.

    It includes two refresh methods. The first is similar to your method, except a new version is built, and then RENAME TABLE is used to swap the new for the old. At no point is the view unavailable for querying, but 2x the space is used for a short time.

    The second method is true "fast refresh", it even has support for aggregation and joins.

    Flexviews is significantly more advanced than the FromDual example referenced by astander.

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  • Mysql物化视图应用

    千次阅读 2012-03-13 16:34:51
    1、基本api  //第一步:创建物化视图  call flexviews.CREATE('demo',  'mv_company_sales_items_monthly',  'INCREMENTAL'  ); ----------数据库、视图名称、刷新类型

    1、基本api

     //第一步:创建物化视图 

    call flexviews.CREATE('demo',
                          'mv_company_sales_items_monthly',
                          'INCREMENTAL'
                          );

    ----------数据库、视图名称、刷新类型(增量刷新)

     

    //获取视图id

    select @mvid := last_insert_id();

      //第二步:增加表,where条件用到

    call flexviews.add_table(@mvid, 'demo', 'orders', 'o', 'USING(CustomerId)');

    -----视图id,数据库名称、表名称、表别名,条件

    v_mview_id - The materialized view id (see flexviews.get_id) v_table_schema - The schema which contains the table to add v_table_name - The name of the table to add v_table_alias - The table alias to use in the view. All tables MUST have an alias. v_join_clause - Every table after the first must have a NOT-NULL join clause

    //第三部:

     

    //第四部:物化视图

    call flexviews.enable(@mvid);

     

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  • 首先mysql的视图不是一种物化视图,他相当于一个虚拟表,本身并不存储数据,当sql在操作视图时所有数据都是从其他表中查询出来的。者带来的问题是使用视图并不能将常用数据分离出来,优化查询速度,切操作视图的很多...
  • 首先mysql的视图不是一种物化视图,他相当于一个虚拟表,本身并不存储数据,当sql在操作视图时所有数据都是从其他表中查询出来的。者带来的问题是使用视图并不能将常用数据分离出来,优化查询速度,切操作视图的很多...
  • MySQL物化视图

    千次阅读 2019-07-25 18:10:31
    首先mysql的视图不是一种物化视图,他相当于一个虚拟表,本身并不存储数据,当sql在操作视图时所有数据都是从其他表中查询出来的。者带来的问题是使用视图并不能将常用数据分离出来,优化查询速度,切操作视图的很多...
  • mysql实现物化视图

    千次阅读 2020-01-14 10:30:33
    原项目用的是国产数据库人大金仓,因用户要求,需要迁移到mysql5.7上,在搜索解决方法之前有了大致思路就是建立物化视图表,然后使用存储过程或者触发器去更新物化视图表就可以了,但想要找有没有更优的方案,于是就...
  • mysql-物化视图-事务

    2020-11-14 21:24:49
    首先mysql的视图不是一种物化视图,他相当于一个虚拟表,本身并不存储数据,当sql在操作视图时所有数据都是从其他表中查询出来的。者带来的问题是使用视图并不能将常用数据分离出来,优化查询速度,切操作视图的很多...
  • MySQL中实现物化视图

    2012-12-17 09:19:03
    真正值得一看的mysql知识。MySQL中实现物化视图(中文版)翻译于外文。
  • 关于MySQL物化视图

    2019-12-03 18:26:52
    请参考MySQL官方文档: https://dev.mysql.com/doc/refman/8.0/en/faqs-views.html#faq-mysql-where-docs-views
  • MySQL的视图、物化视图、触发器、存储过程理解一、视图:(相当于一个路径访问,简化sql语句,执行一些经常要输出的sql语句)优点:缺点:视图再什么时候不能进行新增或则修改:语法:二、触发器:(类似框架中的事件...
  • mysql触发器实现oracle物化视图即不是基于基表的虚表,而是根据表实际存在的实表,需要的朋友可以参考下
  • oracle数据库支持物化视图,是根据基表实际存在的实表,物化视图可以用于预先计算并保存多表的链接(JOIN) 或聚集(GROUP BY)等耗时较...mysql本事不支持物化视图,但是可以通过一些机制实现实现物化视图的功能,...
  • 本文介绍了Mysql 的视图、触发器、存储过程、游标、存储函数基础知识(定义,简单应用,优缺点,适用场景等)以及物化视图的使用。
  • mysql触发器实现oracle物化视图

    千次阅读 2014-02-07 15:06:09
    oracle数据库支持物化视图--不是基于基表的虚表,而是根据表实际存在的实表,即物化视图的数据存储在非易失的存储设备上。 下面实验创建ON COMMIT 的FAST刷新模式,在mysql中用触发器实现insert , update , delete ...
  • 首先mysql的视图不是一种物化视图,他相当于一个虚拟表,本身并不存储数据,当sql在操作视图时所有数据都是从其他表中查询出来的。者带来的问题是使用视图并不能将常用数据分离出来,优化查询速度,切操作视图的很多...
  • 物化视图,它是用于预先计算并保存表连接或聚集等耗时较多的操作的结果,这样,在执行查询时,就可以避免进行这些耗时的操作,从而快速的得到结果。物化视图有很多方面和索引很相似:使用物化视图的目的是为了提高...
  • 物化视图

    2018-01-09 16:12:59
    oracle中有物化视图,但mysql中是没有物化视图 一,什么是物化视图  物化视图是包括一个查询结果的数据库对象,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。物化视图存储基于远程表的数据...

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