MySQL

If the SQL file is too large, there will be MySQL out of memory (Needed XXX bytes), or "MySQL server has gone away" issue; In addition, if the SQL file data is in Chinese, garbled characters will appear.Fix the problem, modify the max_allowed_packet

1, Windows7 under the MySQL5.5.20 free installation version of the configuration(1), download Mysql-5.5.20-win32.zip, extract to the E:\appcenter,e Disk AppCenter folder will appear mysql-5.5.25-winx64 directory, rename it to MySQL.(2), configure

1. Slow Query log:Slow_launch_time=2 the value of a query greater than a certain time (unit: s)Slow_query_log=on/off Turn off slow query logSlow_query_log_file=/opt/data/host-slow.log Slow Query Log location2. Number of connections:Max_connections

The mysqladmin Command (headings) is formatted as follows (where user is the username, password is the new password): mysqladmin-u user-p password Password The command prompts for the original secret Code, and you can modify it when

I. Preface because MySQL 5.5.7 is compiled after using CMake. This article provides a brief introduction to MySQL installation and configuration. Two. Environment preparation 1. Operating system CentOS 6.4 x86_64 2.

Most databases provide window functions, such as Rank,row_number, and so on. MySQL does not provide direct, but can be disguised in the realization, I previously wrote the implementation of Row_number, today there is time to put the implementation

#!/usr/bin/env python#coding: UTF8Import Os,sysImport datetime,shutil,subprocessFrom Config.config import Slow_configClass Cut_mysql (object):Mysql_user,mysql_pass,date_day,slow_log_name,slow_log_path,mysqlsla_log_name,mysqldumpslow_log_name,new_log_

#!/bin/bash# check mysql slave statususer= "check" psw= "* * *" runtime=3600addr= "192.168.*.*" Declare-a slave_isfor IP in $ Addrdoslave_is= ($ (/usr/local/mysql/bin/mysql-h$ip-u${user}-P${PSW}-e "show slave status\g" |grep Running|awk ' {print ($}

Original: MySQL Query cacheMySQL Query execution processQuery Process : The client sends a query to the server; The server checks the query cache first, and returns the results stored in the cache immediately if the cache is hit;

Reprint Address: http://www.2cto.com/database/201212/177380.htmlA stored procedure is simply a collection of one or more MySQL statements that are saved for later use. It can be considered a batch file, although their role is not limited to batch

First QTP to connect to MySQL first to ensure that there is a MySQL data source on the machine does not go to the online next load.I use the MySQL 5.1 data source, after loading, a new TXT document on the desktop, and then change the suffix to UDL,

Brief introduction Data in MySQL is stored in files (or memory) in a variety of different technologies; Each technology uses different storage mechanisms, indexing techniques, locking levels, and ultimately provides a wide range of

First, the preparatory work1, download the source installation package, http://dev.mysql.com/downloads/mysql/(I use mysql-5.6.16)2, I am installed on Ubuntu, need a few dependent programs: CMake, g++, Libncurses5-devSecond, start the installation1.

Due to the need for work, to create a new MySQL user, after reviewing the MySQL manual, did the following methods to record.#新增一个mysql用户custom, the password is obscure and can only be accessed and manipulated from the local database testGRANT Select,

1 in MySQL, the default is not to turn on the slow query log function, we can use show variables like '%slow% ' to see. The results are as follows:650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/26/EA/wKiom1NuKfvDr8nqAAFYiGubJfQ397.jpg

1. What is a transaction: a transaction in a database refers to a logical set of operations that either succeed or do not succeed.2, transaction management: By default, MySQL automatically manages transactions, and an SQL statement exclusively for a

After a low-efficiency SQL statement is queried, you can use the EXPLAIN or DESC command to obtain information about how MySQL executes the SELECT statement, including how the table connects to and connects to the table during the execution of the

Many high-performance websites use the "decomposition connection" technology, that is, to change a single multi-Table connection query to multiple but table queries, and then merge data in the program, for example: Select a. *, B. * from A a join B

MyISAM:The default MySQL plug-in storage engine is one of the most commonly used storage engines in Web, data warehousing, and other application environments. Note: by changing the STORAGE_ENGINE configuration variables, you can easily change the

1 After installing MYSQL, change the ROOT password and use Net startmysql I encountered this problem at startup. C: \ mysql \ bin \ mysqladmin-u root-p shutdown Net start mysql does not have this error prompt! 2 MySQL error 1067 Q: I encountered a 10