MySQL

1, getting ready for workPrepare two machines and install each MySQL database. Like what10.254.141.23 as the primary database10.254.166.60 as from the databaseInstalling MySQL Database Reference "MySQL database Installation"2, Main library open

Replication on MySQL:Master/slave.Master server is the production MySQL instance.Slave server is the Java host (123.57.39.*).First we need to install MySQL server and client on the Java host (123.57.39.*).1.in Master Execute:CREATE USER ' replica ' @

If there is no lock, concurrency is stronger, but data security can be problematic. So the database locks the data.Shared and exclusive locks也就是读写锁，共享锁可以叠加共享锁但是不能加排他锁， 排他锁则不能叠加。根据隔离级别等等，mysql会隐式的给数据自动加锁此外还可以使用share in model, for update

Perform the CREATE DATABASE operationThis. Getexecute (G_con, "CREATE database if not exists newdb");This.sqladdress = "-H" + IP + "-u" + User + "-P" + Password + "newdb";Backup of the databaseprivate void Btn_dump_click (object sender, EventArgs e){

MySQL memory allocation1. MySQL Memory request formula:1.1per-Thread buffers: Each thread buffers the memory allocated for each thread connection. Each thread's connection buffer and result buffer start at a given net_buffer_length size and can

1. Common sense:MySQL is a small relational database management system, the developer of the Swedish MySQL AB company. was acquired by Sun Company on January 16, 2008. And in 2009, Sun was acquired by Oracle.MySQL is an associated database

Say just configure the environment, just wrote a few lines of code, can't wait to run, duang! entered the first pit.Look at the code Static voidMain (string[] args) {Database.setinitializer (NewDropcreatedatabasealways()); varContext

Reprint please indicate the source:This article is from: "Ouyida3 's Blog"1, Basicdatasourcefactorycaused by:java.lang.ClassNotFoundException:org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactorySolution: The original Oracle factory in Tomcat forgot to

MySQL has recently been used, and has previously been used with EF, so try to entityframework+mysql the solution.First search the Internet after a chase information, so start:Install MySQL, I use the version is 5.6.25 (Windows Installer

In practical applications ... Really need to add fixed permissions to the user, and set the corresponding password, so that the program moved to move, do not need to modify the source code, only need to add the same name to MySQL or other database

Use MySQL;DBName database query permissions to the [email protected] users, should maintain full user information, including the IP allowed to log in, or will add any host usersGrant Select on dbname.* to [email protected];Reclaim PermissionsRevoke

Scene:Simulate a day's data, each 10 seconds, traverse 1000 devices, each device simulates a real-time data, the total amount of data is: 24*60*60/10*1000 = 8.64 million records.------------------------------------------------------------------------

I. principle of Master-slave replicationMySQL master-slave synchronization process mainly relies on bin-log, mainly divided into the following three steps:1. Master changes the record to binary log (these are called binary log events, binary logs

After loading the database, the first is good, separated a few days found not openClicking Start does not respond, and then runs through the terminal in the MySQL security directory./mysqlAppeared: Unknown variable '

MySQL implements a tree structure, which is common in 2 ways on a database: A receive table, a pre-ordered traversal tree (MPTT).How to receive a table--Mainly relies on a parent field, which is used to point to the ancestor node, connects the

First, the database conceptThe warehouse used to store the dataHierarchical modelMesh modelRelational model (two-dimensional table) [MySQL, SQL Server, DB2, Oracle]Second, the design of relational model database1, conceptual design (E-R Figure 1:1 1:

Create data (insert data)insert into 表名(字段列表) valuse(值列表);insert into exam_student(stu_name,stu_no) values(‘xiaoming‘,‘1205040219‘);If you need to set values for all the fields when inserting data, you can omit the field list, which is required to

Because students need to install MySQL, the installation process, all the way to Baidu, here to record a step-playing. It will be used in the future. 1.mysql-5.7.5-m15-winx64.zip Download　　　　　Official

The following is an excerpt from the official MySQL documentation about manually installing the MySQL binary distribution:One: InstallationThe basic commands that must be performed to install and use the MySQL binary distribution are:shell> Groupadd

MySQL Learning PreparationBriefly:I. Understanding of database knowledgeSecond, the environment constructionThird, MySQL basic operationI. Understanding of database knowledge1, why need database management system?A: It is easy for us to manage the