mysql materialized view

Mysql trigger Implements oracle Materialized view sample code bitsCN.com Oracle Database supports materialized views-instead of a virtual table based on the base table, the data of Materialized views is stored on non-easy storage devices based on the actual real table exist

ALTER event ' MyEvent ' On completion PRESERVE ENABLE; --Closes ALTER EVENT ' myevent ' on completion PRESERVE DISABLE; MySQL does not start the event by default, so you need to modify your My.ini or my.cnf[mysqld] to add the following as Downlink Event_scheduler=1 Three simulated materialized views 1) First build a base table. SQL code CREATE TABLE ' user ' ( ' Id ' int () NOT

Oracle databases support materialized views-not virtual tables based on base tables, but based on actual tables that are actually present in a table-materialized views are stored on nonvolatile storage devices.The following experiment creates the Fast refresh mode on COMMIT, which is implemented in MySQL with the trigger INSERT, UPDATE, delete refresh operation1,

Oracle materialized view code example, oracle Materialized View Materialized View of Oracle Recently, oracle materialized views have been updated based on the project business needs. Y

ORACLE materialized view and oracle Materialized View In the last few days, I have provided a View to the W System in the P project environment. Due to the complicated query logic and large data volume, the query speed is slow each time a

Original address: http://hi.baidu.com/gukeming888/blog/item/2682f69481c8237154fb9662.html Materialized views (materialized view), referred to as snapshots (Snapshot) in previous versions of Oracle. The materialized views of Oracle provide powerful features that can be used to anticipate and save the results of time-con

2014-06-08 Baoxinjian1. usage A materialized view is a database object that includes a query result, which is a local copy of the remote data, or is used to generate a summary table based on the sum of the data tables.Materialized views store data based on remote tables and can also be referred to as snapshots. For replication, materialized views allow you

The fast refresh mechanism for Oracle materialized views is done through materialized view logs. How Oracle can support a fast refresh of multiple materialized views through a materialized view log, this article simply describes h

Recently, I have seen some articles about Oracle materialized views, which are integrated and detailed for memo: The previous version of MaterializedView is called SNAPSHOT ), renamed The Materialized View From 9i. In fact, both snapshots and materialized views can reflect the characteristics of this object. The data i

effective for subsequent refreshes. 1.3 materialized views can be refreshed in three ways: COMPLETE, FAST, and FORCE. 1) a complete refresh operation deletes all records in the table (if a single table is refreshed, TRUNCATE may be used ), then, the materialized view is regenerated based on the definition of the query statement in the

Today, we will mainly discuss the correct use of MQT materialized query tables in the DB2 materialized view, the following is a detailed description of the main content of the correct use of the MQT materialized query table in the materialized

The following articles mainly describe the correct use of the MQT materialized query table in the materialized view of the DB2 database. If you encounter the application of the MQT materialized query table in the materialized view

The following articles mainly introduce the correct use of MQT materialized query tables in the materialized views of DB2 databases, if you are a beginner in the practical application of the correct use of the MQT materialized query table in the materialized view of DB2 data

I. general usage of Materialized views are a special physical table. Materialized views are relative to normal views. A common view is a virtual table, which has many application limitations. Oracle converts any View query to a view SQL statement query. This improves the ove

DB2 Materialized View (Materialized Query Tables, MQT), materializedmqt The Materialized View of DB2 MQT is a table defined based on the query results. The data contained in the MQT comes from one or more tables based on the MQT definition, using MQT can significantly improv

DB2 materialized view Mqts are based on a table defined by the query result, and the MQT contains data from one or more tables on which the MQT definition is based, and using MQTS can significantly improve the operation performance of the query. The views and mqts for the database are defined based on a query. The query on which the view is based will run wheneve

I. theoretical part The Materialized View of Oracle is a database object that includes query results. It is a local copy of remote data or is used to generate a summary table based on the sum of data tables. Materialized View stores data based on remote tables, also known as snapshots. The

First, materialized view overviewThe materialized view of Oracle is a database pair image that includes a query result, which is a local copy of the remote data, or is used to generate a summary table based on the sum of the data tables. Materialized views store data based o

, COL1 varchar), COL2 varchar ($), COL3 VARCHAR (+), COL4 varchar (+), COL5 varchar, PRIMARY KEY (ID)) ORGANIZE by ROW;Create a tableCREATE TABLE t_mqt (ID, COL1, COL2, COL3) as (select ID, COL1, COL2, COL3 from T) DATA initially DEFERRED REFRESH IMMEDIATE maintained by SYSTEM; SET INTEGRITY for T_MQT IMMEDIATE CHECKED full ACCESS;Write data to the original tableINSERT into T (IDs, COL1, COL2, COL3, COL4, COL5) VALUES

Tags: force entity fetch number Save time existence comm Simple aggregation/*Oracle materialized View*//*Why use materialized views?Materialized views are widely used as a means of SQL tuning in a data warehouse environment.A large number of long query statements, poor processing, will cause serious I/O problems.*//*Wh