MySQL

"A windows service with the name MYSQL already e..." error occurs when MySQL is installed: a windows service with the name MYSQL already exists.Please uninstall this service correctly or choose a different name for the new service.Start -- run --

MySQL Character Set and copy_and_convert about copy_and_convert when conducting a business stress test on MySQL, we found in the perf results that copy_and_convert is a cpu-consuming operation. This function refers to content conversion between

Batch kill mysql process if a large number of operations can be generated through a series of select statements, then theoretically these results can be batch processed. Www.2cto.com, but mysql does not provide the eval function for analyzing the

MySQL Query Cache (Cache) SQL code www.2cto.com # Example MySQL config file for medium systems. # is generated by editing the mysql-5.1.37-win32 OF THE my-medium.ini, and the application and database are on one machine. # This is for a system with

There is no 'root' @ '%' registered solves the problem of exporting a database from MYSQL on another machine and generating. the SQL file www.2cto.com is imported to my machine. after the SQL file, the following error occurs during database

Mysql development specification document 1. mysql database naming convention 2. table Structure Design and Data Type Selection 3. development considerations www.2cto.com 1. mysql database naming rules 1.1 naming rules:

Mysql stress test shell script Mysql comes with the stress test tool mysqlslap, so we don't have to write our own program to test the pressure on Mysql reading. The stress test shell script is as follows: www.2cto.com [plain] #! /Bin/sh while true

The configuration of the master server (master) is simple. You only need to modify the two parts in the my. cnf configuration file. Modify the server_id attribute in my. cnf. Set the master server to 1, that is, server-id = 1. Modify the log-bin

[MySQL] converts the date and time formats. Here is an example of using the date function. The following query Selects all records. The value of date_col is within the last 30 days: www.2cto.com mysql> SELECT something FROM table WHERE TO_DAYS (NOW (

Linux MySQL source code compilation and Installation System Platform: Ubuntu12.04 compiling environment: gcc-4.6.3 preparation work: www.2cto.com mysql-5.5.28.tar.gz cmake-2.8.10.2.tar.gzncurses-5.9.tar.gz because of mysql5.5 or above version

The best way to deal with the insertion of int null values in mysql is to: www.2cto.com. in this way, the null value is not allowed to be inserted as 0. Although it is necessary to judge when it is used up, there will be no problems. Other methods

Start mysql service in win7We often encounter cases where mysql services cannot be started using some tools.In this case, we only need to manually start it. There is no need to bother with the command line. Here is a simple method,Enter "services"

Detailed records of innobackupex different backup methods [html] common backup mode [root @ Slave02 tmp] # innobackupex -- database = "inno test" -- user = root -- password = root -- no-lock -- defaults-file =/etc/my. cnf/data0/backup/mysql

Install mysql compressed package record install mysql record [root @ eegooserver3 ~] # Groupadd mysql [root @ eegooserver3 ~] # Useradd-g mysql [root @ eegooserver3 ~] # Cd/opt [root @ eegooserver3 opt] # tar zxvf

Millions of SQL optimization Summary 1: Basic Environment 1: Database: Mysql2: Table Structure 3: data quantity: 500 + 2.1 2: Objective: original SQL statement selectzero_dateline, sum (item_amount) as 'sum' from c_log_item where item_id in (bytes, 1

MySql remote connection cannot be enabled solution 1. Change the table. Use the mysql management tool. For example, SQLyog Enterprise may not allow remote login from your account, but only on localhost. At this time, you only need to use the mysql

Using Putty command line to open up remote MySQL accessIn Linux, after MySQL is installed by default, it cannot be remotely accessed. It can only be accessed locally, that is, it can only initiate database connections from 127.0.0.1. To solve this

From the installation start to talk about MySQL security when you install MySQL, there will be a prompt: [root @ localhost Desktop] # rpm-ivh MySQL-server-5.5.28-1.rhel5.i386.rpmPreparing... ######################################## ### [100%] 1:

Install and configure mysql online under centos 1. install mysql server [java] yum-y install mysql-server 2. Load service to start the service [java]/etc/rc. d/init. d/mysqld start 3. Set mysql Service Startup to auto start [java] chkconfig mysqld

MYSQL uses Limit to Limit the number of updated rows to modify the config table. Change is_ OK of row 5607 to true. The following SQL statement is used to implement the SQL code UPDATE channel_config set is_adam_pub = 1 where channel_id in (select