about mysql

tps-transactions per Second (number of things transferred per second), which is the number of transactions per second that the server processes, and a performance metric that is unique to the storage engine that supports transactions such as

Reprint Please indicate the source: The Curtain Roll westerly column (Http://blog.csdn.net/ljxfblog)Several ways MySQL obtains the self-increment ID Using the max function: select Max (ID) from TableName Advantages: Easy and

Server Leasing talk about How MySQL can turn on remote login function do the site, to update the database frequently, contact with the database is certainly MySQL. Sometimes when the station is built because the database and the website are placed

One. Install MySQLWindows, download the MySQL installation file directly, double-click the installation file next to proceed;Linux installation is also very simple, in addition to download the installation package for installation, the General Linux

The following is personal understanding, if there are errors, but also to correct!!Most of MySQL's transactional storage engine is not a simple row-level lock, based on the promotion of concurrency performance considerations, they generally

Mysql----ERROR:NO Query specifiedMySQL throws the error:Error:no query specifiedThis error occurs because of a SQL illegal reason:such as: SELECT * from Abc\g;OrSELECT * from ABC;;There is no need to add a semicolon after \g;Mysql> SELECT * from

In my opinion, hibernate is the most troublesome thing is to configure the Foreign Key association, a slight error will appear configuration errors, the current project is all in the use of mybaits, and mybaits use is much simpler, at least,

1, when the function mysql_connect the first three parameters ( server username password）相同，并且第四个参数（new_link）不传递时候，重复调用 mysql_connect will return the same connection.PHP codePHP $db mysql_connect (' localhost ', ' root ', ' root '); Var_dump

For example, a table user (Id,name) has a search on the ID primary key.Test:1. Build a table usersCreate table:create Table ' users ' (' id ' int (one) is not NULL,' Name ' varchar (255) DEFAULT NULL,PRIMARY KEY (' id ')) Engine=innodb DEFAULT

MySQL data typeThe type of data field defined in MySQL is important for optimizing your database.MySQL supports multiple types and can be broadly divided into three categories: numeric, date/time, and string (character) types.First, numeric

An index is also essentially a table that stores the column item values that are listed as indexes and pointers to true full records. The index is transparent to the user and is used only by the database engine to speed up the retrieval of real

This period is mainly to learn the basic MySQL grammar, there will be a renewal of the article, please look forward to Differences in grammar My main point here is the difference in grammar. 1. Default constraint Difference: MySQL inside the

Mysql What about MySQL losing the root password? Author: Wang Mei (HeartIcy@163.com) The loss of the password is very distressing things, especially the root password lost: (. Install yourself Play lost also lost, but in the event of a

MySQL Gets the current date time functionGet the current date + time (date + times) function: Now ()Mysql> Select Now (); +---------------------+| Now () |+---------------------+| 2008-08-08 22:20:46 |+---------------------+Get the current date +

First, what is a thing?Personal understanding, the SQL is the thing is to do a group of SQL statements, the group of SQL statements or all successful execution, otherwise it will not be fully enforced. Or a series of operations performed as a single

Yesterday because the classmate's MySQL database did not know what to do, resulting in the root user can not use theIn particular, the use of root users do not need to enter the password can only see the Infomation_schema table, feel the root

Today to do the project encountered a problem, Baidu has not found a long time the problem liesIt's jiangzi, a table.The associated tableThen I query with the SQL statementPoint.pid,point.pname,group_concat (downsite.pname) dname from Point,downsite

Recently in charge of the company's SMS Gateway maintenance and construction, with the company's business development of short-message dependence more and more serious, SMS daily send volume is more than the previous day more than 40 W send a daily

650) this.width=650; "src=" http://s5.51cto.com/wyfs02/M00/8B/22/wKiom1hFNLHhCGo6AAA4eVx2Dz8403.jpg "title=" icon 2. JPG "alt=" Wkiom1hfnlhhcgo6aaa4evx2dz8403.jpg "/>A brief discussion on MySQL full-Library backup Part1 : write at the top

Brief introduction:Mysql built-in function scheme, suitable for existing business, new add lbs function, add latitude and longitude field to avoid data migration , after 5.7.5 realize more multifunctional InnoDB space search method, the previous