MySQL

Recently help a friend to make a small tool. Think about it. or Python to write it up faster. By the way, you can review python.The specific is to obtain from the database to all need to detect the IP. Then the multithreading is scanned.

Mysqldum Exporting Big Data table errors[Email protected] itop]# mysqldump-u root-p--opt itop >/home/itop/itop-backup.sqlEnter Password:Mysqldump:error 2020:got packet bigger than ' Max_allowed_packet ' bytes when dumping table at attachment

First Step: Environment configurationClone and configure two hosts, one for master and one for slave. and shut down the firewall.SYSTEMCLT Disable FIREWALLDStep Two: Modify Master HostModify the master host's my.cnf[Mysqld]#port

In the CentOS (Fedora, RedHat) system, you can use yum install mysql commands to install MySQL, but the MySQL version installed is generally older, so it is recommended to compile the installation by source code or download rpm the latest

Turn on slow query logAdd two configuration parameters under the [mysqld] line in the configuration file my.cnf or My.iniSlow_query_log = on #开启慢查询long_query_time=1 #设置慢查询时间 1 s Slow_query_log_file="d:/phpstudy/mysql/data/slow_query.log"

First, the role of MysqlreportFor MySQL configuration optimization, you must first identify the MySQL performance bottleneck, and the show status output report is the reference data used to calculate the performance bottleneck. Mysqlreport is not as

How to choose the storage engine for MySQLIn development, we often use the storage engine myisam/innodb/memoryMyISAM storage: If the table is not high on the transaction and is query-and-add-based, we consider using the MyISAM storage engine. , such

Why does the index become faster when you create it?A : after using the index, the query is based on a two-fork tree algorithm to find recordsConsiderations for indexing Use :The cost of the index:1. Disk space usage2. Effects on DML (new, modified,

First: Chapter One1: Using TransactionsTransaction ; Select * from T1; commit;2: View transaction statusMysql>Show variables like 'autocommit';+---------------+-------+|Variable_name|Value|+---------------+-------+|Autocommit| on |+-------------

Tag: operation without span cal BSP title default DDR statusThe problem of MySQL cannot be remotely accessed with IP address under UbuntuMethod 1:1.mysql>grant all privileges on * * to ' root ' @ '% ' identified by ' root ';　　(%) Represents all

mysql> status; # # #查看数据库基本信息·mysql> show databases; # # # # # #查看数据库列表信息·mysql> use MySQL; # # # #切到mysql This library·Mysql> show Tables; # # # #查看着个库中有哪些表·mysql> use MySQL # # # #切到mysql This library·mysql> describe user; # # #查看着个user表的结构·# # # #

Install MySQL install/remove of the Service denied! error resolution在windos 的cmd下安装mysql在mysql的bin目录下面执行： mysqld --install报错： 信息如下：Install/Remove of the Service Denied 解决办法：打开cmd.exe程序的时候选择“用管理员身份打开”。mysql5.6 version of the installation 1

Four types of features:Atomicity (atomicity): All operations in a transaction are treated as a collation, either complete or all rolled back.Consistency (consistency): The data in the database is logically consistent before and after the operation.

1: See if a MySQL version is availablerpm -qa | grep mysqlDelete MySQL account and user groupDelete/ETC/MY.CNF2: Some words are deletedrpm -e mysql-......Orcommen]# rpm -e --nodeps mysql-......3: Download rpmwget

1. First log on to Linux with Administrator privileges;2. Enter: VI/ETC/MY.CNF enter. Then press "I" keyboard, enter in the last line of this file: Skip-grant-tables then press ESC, then enter ": Wq" to save and exit;3. Restart the MySQL service

1.使用navicat修改2.进入命令行界面（F6）3.输入：SELECT @@GLOBAL.sql_mode;4.结果：ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION5.6.然后我们来修改sql_mode7.输入：set GLOBAL sql_mode

Open a. context.xml file, brutishness: apache-tomcat-7.0.61\conf, add the following code:Then add the following code to the spring configuration file: Start Tomcat when you're done adding.Configuring a MySQL data source in Tomcat

Basic command:1 command to add '; ' Indicates the end of the command -2mysql> statusCheck current login information, MySQL version information -3Mysql> Helpfrequently used help commands -4Mysql> select version ();MySQL version information -5Mysql>

Environmental informationInstallation Environment: Ubuntu Desktop versionM installation version: MySQL 5.7.23Installation stepsThe installation process is simple in a Linux environment. Three command lines to complete the installation:　　1. sudo

JMeter can not directly connect to the database, first install a jmeter connection to the MySQL database file Mysql-connector-java-5.1.7-bin.jar (do not install, put in a location.) ）Different database, such as Oracle, SQL Server and other different