MySQL

On the internet to check a lot, and finally realized. Let's write the procedure below:First, create a file context.xml under Webroot/meta-inf, with the following:XML version= "1.0" encoding= "UTF-8"?> Context> Resourcename=

For MySQL database master-slave replication delay monitoring, we can rely on Percona's powerful weapon pt-heartbeat to achieve. Pt-heartbeat updates a specific table on the main library by using timestamp, and then reads the updated timestamp from

1. Test database performance with an automated build script Mysqlslap-uroot-p123-a--debug-info--concurrency=50,100--number-of-queries=200--engine=myisam,innodb Parameter introduction-U: User name-P: Password-A (--auto-generate-sql):

the modified users are listed as root. first, the root of the original myql password;method One:outside the MySQL system, use the Mysqladmin# mysqladmin-u root-p Password "test123"Enter Password: "Enter the original password"Method Two:by logging

To establish a stored procedure:DELIMITER $ $USE ' test ' $ $DROP PROCEDURE IF EXISTS ' user_user_selectuserbyproandcity_sp ' $ $CREATE definer= ' demao ' @ '% ' PROCEDURE ' user_user_selectuserbyproandcity_sp ' (in Provinceid int,in cityid int,in

error: 1064  you have an error in your sql syntax;  Check the manual that corresponds to your mysql server version  for the right syntax to use near  ' Alter table user add  column show_view_priv enum (' N ', ' Y ')  CHARACTER SET utf8 NOT  '  at

The common MySQL show statements are listed below:1.show databases; Displays the names of all databases in MySQL2.show tables [from database_name]; Displays the names of all tables in the current database3.show columns from table_name; Show column

First, installationDownload MySQL installable DMG version to MySQL official online http://dev.mysql.com/downloads/mysql/For example:Mac OS X ver. 10.7 (x86, 64-bit), DMG ArchiveThe downloaded files are: mysql-5.6.10-osx10.7-x86_64.dmg1. Click,

In write SQL, there are often such things as updating a row of records, and then getting the updated line. itself from the program, no difficulty, the big deal to cache this line, finished direct access. But from the database point of view, how can

Haven't written a blog for a long time, but also accumulated a lot of problems, next time find a way together, and then record down, for a rainy day. Our list of contacts often has a need to sort by initials. This is very convenient, very clear, if

Preparatory workFirst, we need to build ftpserverYum Install vsftpd service vsftpd startSo the FTP service is up, here it is simply used, so no configuration file is used. This way we simply place the required files under the/var/ftp/pub/folder, and

Optimize your goals Reduce the number of IOIo is always the most vulnerable to the database, which is determined by the responsibility of the database, most of the database operations more than 90% of the time is occupied by IO operations,

A multiple-table query using the SELECT clauseSELECT field name from Table 1, table 2 ... WHERE table 1. field = Table 2. Fields and other query conditionsSELECT A.id,a.name,a.address,a.date,b.math,b.english,b.chinese from Tb_demo065_tel as

To operate a remote Linux server prepare:1, download FileZilla used to upload files to the Linux system2. Download Putty Linux System Operation windowInstalling the JDK1. Check your Linux bits first:Uname-a;Download the corresponding JDK on the

I've shared two small apps I've written myself, see this blog post Baidu Map Development of two application source sharing (Android version), I did not expect someone to find me to do, years ago delivery, time is not very tight, probably understand

1) Connect MySQL$con = mysql_connect ("localhost", "root", "12345");if (! $con) { die (' Could not connect: '. Mysql_error ());}Mysql_close ($con);?>2) PHP MySQL CREATE database and table $con =mysql_connect ("localhost", "root", "123456"); if (!

The board has done 2 years of web development training (Getting started?). ), get a lot of students praise, it is quite a feeling of accomplishment, ready to take some time according to some of the lessons prepared at the time to sort out a series

Recently made a report, there is a field to save money, involving decimals, do not want to set the database field to float, and other queries come out, the real value is added a random number, too vomit, check the information, the field format

MySQL dual master architecture, which is supplemented by load balancing devices, can achieve the MySQL database load balancing high performance and high availability, load balancing devices can be based on the algorithm to the load of the database

Use MySQL in C ++ The software on my computer is as follows: VS2012 For MySQL 5.6 The operating system is 64-bit win8.1 1. Prerequisites Download and install MySQL 2. Configuration (1) Add the include directory: MY_ SQL directory/include to project