Programmer Think

Since our Web application is running in tomcat, the request must arrive at Tomcat first. Tomcat actually handles the request as follows. First, provide Socket service The start of Tomcat must be Socket service, but it only supports HTTP protocol! In fact, we can expand our thinking here. Since Tomcat is based on Socket, what about BIO or NIO ...

Demand: The user instance SERV is divided into different databases according to the org? ID Agreement: Beijing (ORG UU id = 101), Shanghai (ORG UU id = 102), Shenzhen (ORG UU id = 103), Chongqing (ORG UU id = 104), Sichuan (ORG UU id = 105) Beijing bjdb, Shanghai shdb, Shenzhen szdb and Chongqing cqdb are built on dn10 and dn11 Sichuan scd ...

First read the quick start of the official website, then build it yourself. The result is various errors and pits.Record it. 1. Environment A virtual machine, a cloud server, a local Mac (because mysql is installed on the cloud server and locally, or you can use the virtual machine entirely, just look at yourself), mycat is deployed on the virt ...

1. Key xml configuration tables    server.xml The user tab specifies the account to access the database. <?xml version="1.0" encoding="UTF-8"?> <!-- - - Licensed under the Apache License, Version 2.0 (the "License"); - you may not use this file except in compliance with the License. - Y ...

mycat mainly provides a specific configuration of database segmentation. In this article, we will not do in-depth analysis, let the program run first! MYCAT official website: http://www.mycat.io/ ා don't be afraid of Chinese 1 > environment: CentOS operating system mysql5.6 Master database host: 192.168.0.1 Slave a host: 192.168.0 ...

Use of sessionStorge The sessionStorage property allows you to access a session Storage object. It is similar to localStorage, except that the data stored in localStorage has no expiration time setting, and the data stored in sessionStorage will be cleared at the end of the page session. The page session is maintained while the browser is open, ...

What is MyCat? Look at the introduction on the official website. A Completely Open Source Large Database Cluster for Enterprise Application Development Enhanced database supporting transactions, ACID, and MySQL alternatives An enterprise-level database that can be considered a MySQL cluster to replace the expensive Oracle cluster ...

Based on MySQL master-slave replication, this paper uses mycat to realize read-write separation. The role of mycat in applications can be seen in the following figure: mycat allows programmers to only care about business code writing, without worrying about load balancing of back-end database cluster, separation of reading and writing, data ...

Original address: http://blog.csdn.net/Dreamcode/article/details/50401858 Full article download address: http://download.csdn.net/detail/dreamcode/9383516  Simply put, we can understand the horizontal segmentation of data as the segmentation of data rows, that is to say, some rows in the table are divided into one database, while some o ...