MySQL

Environment:mysql-vip:192.168.1.3mysql-master1:192.168.1.1mysql-master2:192.168.1.2OS version: CentOS release 6.4 (Final) Linux 2.6.32-358.el6.x86_64MySQL version: 5.6.14Keepalived version: 1.2.13First, MySQL master-master configuration1. Modify the

Method 1,Analyze table:This statement is used to analyze and store the keyword distribution of a table. During parsing, the table is locked with a read lock. This is useful for MyISAM, BDB, and InnoDB tables.Method 2,CHECK TABLE:Check if one or more

Use of pooled connection pooling results in a production environment MYSQL8 hour problem encounteredThe C3P0 connection pool was then usedThe configuration is as follows: c3p0 Pool config - Propertyname= "Hibernate.connection.provider_class">

1. Three-table joint query select Xx,xx from a, B, C Cartesian product, equivalent to cross join 4. Cross join--lists all combinations on both sides, also called Descartes set A.rows * b.rowsselect *from Sales S Cross join Customers C 5. INNER JOIN =

CentOS's yum installed MySQL is version 5.1 and can be installed via the official RPM package version 5.5#to view related items for an installationRpm-qa|grep-i mysql#Stop ServiceService mysqld Stop#UninstallYum Remove mysql-*orrpm-e xxx#Download

First, Hardware EnvironmentMaster:dell R720 Intel (R) Xeon (r) CPU e5-2640 v2 @ 2.00GHzMEM 64G , Disk 4*2.5 SAS Network The thousand trillionSlave:dell R720 Intel (R) Xeon (r) CPU e5-2640 v2 @ 2.00GHzMEM 64G , Disk 4*2.5 SAS Network The thousand

 Grant Replication Slave on * * to ' rep ' @ ' 172.17.1.% ' identified by ' 12qazxcvfr34 ';Change Master to master_host= ' 172.17.1.150 ', master_user= ' rep ', master_password= ' 12qazxcvfr34 ', master_log_file= ' Mysql-bin.000001 ',

Purpose: Host system/var directory is almost full, the query is the largest file is MySQL ibdata1 file, 17G size, it is necessary to migrate this file to other directories to release the/var directory space.1. It's a good habit to back up the

#修改字段类型ALTER TABLE ' TABLE_NAME ' modify column IP varchar (50);#增加字段ALTER TABLE ' table_name ' Add IP varchar (50);#增加PRIMARY key (primary key index)ALTER TABLE ' table_name ' ADD PRIMARY KEY (' IP ');#添加UNIQUE (unique index)ALTER TABLE '

Environment-based library is 111.111.111.110 from library to 111.111.111.1111. Main Library CREATE database replication dedicated user-- executed on the main library, Create user ReplMySQL – UrootGrant replication Slave,replication Client on * *

The Database Order table has an Order Number field Order_id,varchar type, indexed, and the order table has 36W data.Using the SELECT * from T_order where order_id like ' dt% ', the query time is only 0.03 seconds and tens of thousands of data is

First, the test environment:Rhel1 ———— Master ———— 192.168.10.1 ———— the user and password for slave synchronization are slaveRhel2 ———— slave ———— 192.168.10.2 ———— synchronize all databases on masterSecond, install MySQL on rhel1 and Rhel2

in Xampp, MySQL failed to start service, prompting the error that the 1067 process terminated unexpectedlyWorkaround:1. Enter the XAMPP installation directory2, enter the mysql/bin/directory, open My.ini, modify[Mysqld]port= 3306socket=

Code in views.py:def show_all_user (req):Num=1If ' Pagenum ' in req. POST:Num=req. post[' Pagenum ']Tlist=user.objects.all ()P=paginator (tlist,30)Page=p.page (num)Return Render_to_response (' show_all_user.html ', {' All_user ':p age.object_list, '

1. Installing the sudo yum install Mysql-devel installation components and libraries2.#include #include #include #include int main ( int argc, const char *argv[]) { mysql mysql; Mysql_res *result; Mysql_row ROW; Mysql_init (&mysql);

Today, I copy the database data to Linux under the running program "MySQL table is read only resolution" This problem occurs, query data.Under Linux, execute the following command#mysqladmin-U root-p flush-tablesAnd there's the directory permissions

Database master-slave replication principle:The master-slave replication of the database is copied from the master database to the slave database, and the entire replication between master and slave takes three threads, two of which are on the slave

Pre-Preparation:Createt table Employee (ID int, Name varchar (4));Use the following methods to loop the data into a table.--------------------------------------------------------------------------------------------------------------- ----------------

The last configuration of mysql5.5 installation in win8 does not respond. The last configuration of mysql5.5 installation in win8 does not respond. The installation of mysql5.5 in win8 went smoothly, but after configuring the mysql service and

Principles for designing Mysql Indexes 1. The index column to be searched is not necessarily the column to be selected. In other words, the column most suitable for indexing is the column that appears in the WHERE clause or the column specified in