index mysql

This article system: rhel5.8ip:192.168.100.150Database version: mysql-5.6.151, create the deployment MySQL service account:[[email protected] ~]# useradd-d/opt/mysql mysql[[email protected] ~]# echo "MySQL" |passwd--stdin mysqlchanging passwo Rd for

All MySQL columns can use the index. Using indexes on related columns is the best way to improve the performance of select operations. Defines the maximum number of indexes and the maximum index length per table based on the storage engine. All

Written in the front: discuz! as a leading community system, for the majority of webmasters to provide a one-stop web site solutions, but also open source (although part of the code is encrypted), it for the vertical field of the industry has made a

1 MySQL Index type "Major 4 class index"To create an index:         1. Add primary key (primary key index) " PRIMARY key: A unique index that must be specified as primary key           mysql >alter TABLE ' table_name ' ADD PRIMARY KEY (' column ')

1. Connection database format: mysql-h host address-u user name-P user password 1.1. Connect to MySQL on this computer. First open the DOS window, then enter the directory Mysql\bin, and then type the command Mysql-u root-p, enter after you are

Transferred from: http://blog.csdn.net/duck_arrow/article/details/8264686Concept:A primary key (primary key) uniquely identifies a property or group of properties for a row in a table. A table can have only one primary key, but there may be multiple

PrefaceBefore writing to MySQL on the table additions and deletions (query the most important), it feels like MySQL is almost finished, did not want to continue to learn the mentality, the reason may be due to other people's influence, think for

 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 ',

Database environment Dev: Development environment, development of read-write, can modify table structure. Developers can modify the table structure and can modify the data at will, but need to ensure that other development colleagues are

Creating an index is the establishment of an index on one or more columns of a table to increase the speed of access to the table. There are 3 ways to create an index, the 3 ways to create an index when creating a table, to create an index on a

The ultimate goal of replication is to keep the data of one server in sync with the data of another server, which has reached data redundancy or service load balancing. A primary server can connect to multiple slave servers, and from the server it

Environment Planning: Host Name IP address management node tong3192.168.1.249 master node tong2192.168.1.248 master node tong1194251.247mysqldba Technology Group 378190849 Wuhan-linux O & M group 2364156191. Network and host name configuration set

MYSQL command, mysqlcommandMysql Command [to] From: http://www.cnblogs.com/zhangzhu/archive/2013/07/04/3172486.html   1. Connect to MYSQL on the local machine.First, open the DOS window, enter the mysql \ bin directory, type the mysql-u root-p

MySQL index details, MySQL index detailsI. Introduction to index basics 1.1 In MySQL, indexes are also called keys. They are a data structure that the storage engine uses to quickly find records. Indexes are critical to good performance. Especially

MySQL alter command, mysqlalter Use the alter command in mysql to edit the table structure. The details are as follows: Modify Field Type mysql> alter table employee change depno depno int(5) not null; Add Index Mysql> alter table name add index

Accelerate the optimization of MySQL index analysis for PHP dynamic websites. This article describes how to accelerate MySQL index analysis and optimization for dynamic websites. 1. what is an index? Indexes are used to quickly search for records

MySQL index analysis and optimization indexes are used to quickly search for records with specific values. all MySQL indexes are saved as B-trees. If no index exists, MySQL must scan all the records of the entire table from the first record until

Prepare the environment: the server operating system is RHEL6.4x86 _ 64, to minimize installation. Both host A and host B disable the firewall and SELINUX. the IP addresses are 192.168.131.129 and 192.168.131.130, and the MySQL version is 5.6.26,

EXPLAIN is the main method for viewing how the MySQL Optimizer determines how to execute a query. this function has limitations, so that it always tells the truth, but can obtain the best information. after learning to EXPLAIN, you will understand

Explanation of MySQL execution plan Explain syntax Explain select ...... Variant:1. Explain extended select ...... Decompile the execution plan into a SELECT statement and run show warnings to obtain the query statement optimized by the MySQL