MySQL

Create a table that uses the column index: CREATE TABLE Index_test1 (ID int NOT NULL auto_increment,first_name varchar (+) NOT NULL,last_name varchar (+) NOT NULL,Primary key (ID),Index Index_first (first_name),Index Index_last (last_name)) engine

Show variables like ' character% ';The results are as follows:+--------------------------+---------------------------------------------------------------+| variable_name | Value|+--------------------------+--------------------------------------------

1. The associated query modifies the update ex_question_questioncategory T5INNER JOIN (SELECT QC. Question_id,qc. question_category_id from Ex_question_questioncategory QC right JOIN(SELECT q.question_id,q.content from Ex_ Question Q WHERE

Completing the Ubuntu14.04 installation on the virtual machineOne, configure the IP to confirm the normal Internet accessTwo, sudo apt-get install aptitudeNote: Aptitude function is similar to apt-get, and personal preference is to use aptitude to

MySQL Installation: Method: 1. Original method, download compressed file, unzip, install, configure 2.dmp file install 3.brew Install here Use Brew installation: A.brew install MySQL B.MYSQL.S Erver Start//Open use C. Set boot entry:     mkdir -p

First, install the database1. Get and install MySQLsudo Install Mysql-server2. Set the root password (enter the password in the pop-up prompt box)3, log in the database, enter Mysql-u root-p, followed by the input password prompt, enter the password

General error:2006 MySQL server have gone away released: Source: Added on: 2014-10-02 23:00:56 View:146 Comments: 0If we look at MySQL prompt MySQL server has gone away is due to a variety of reasons cause MySQL when the machine, resulting in MySQL

* Use MySQL data cache to improve efficiency and considerations:1. Application Environment: tables that change infrequently and queries that are identical to this table2. Not applicable to statements written on the server side3. According to the

The experiment requires the environment:Two Linux serversmaster:192.168.3.10slave:192.168.3.11The premise is that both have MySQL installed.First, configure the MySQL master server1. Modify or add the following in/ETC/MY.CNF:[Email protected] ~]#

MySQL server's master-slave configuration, which allows for read-write separation, or can be recovered from the standby library after the main library has been hung offNeed two machines, install MySQL, two machines in a connected LANHost a:192.168.1.

Key type:1. Primary key2. Unique key3. Foreign keyIndex Type:1. Hash index2. Ordered index (btree/rtree)Creation of the index:1. Primary key creates two indexes: Hash index and ordered index2. Unique key creates two indexes: Hash index and ordered

Mysql Server Optimization 1. View MySQL server parameters Show variables;   /show variables like ' parameter name '; --mysql Server configuration information Show status; /show global status;  /Show status like ' field name '; --mysql

From:http://www.111cn.net/database/mysql/59776.htmMySQL optimization I divided into two parts, one is the optimization of the server physical hardware , and the second is the MySQL itself (my.cnf) optimization .First, the impact of server hardware

About the SKIP-INNODB option also does not enable the InnoDB engine solutionI previously used a WAMP integrated environment database, in order to facilitate the direct copy of the data file.But later found that the default engine of the Phpstudy

MySQL datetime field insertion is very simple and takes the form of a string similar to the following0000-00-00 00:00:00So we need to use newLISP to get the epoch seconds, then convert it into character form and create the SQL statement, here's an

1. Install PHP 5We must pass PHP-FPM to get PHP5 to work properly, install the command:Apt-get Install PHP5-FPMPHP-FPM is a daemon process.2. Install MySQL 5 databaseTo install the MySQL Run command:Apt-get Install Mysql-server mysql-clientDuring

Recently to the school to do a project, the database to use Oracle, if under Windows, the installation of Oracle is relatively simple, but unfortunately, I have recently switched to the Mac, so this is a big problem, Oracle now the latest version

1. What is a row subquery:Select t1.*, (select vn from T2 where t2.c.1=t1.c3 limit 1) where t1.cn= ' xxx ' ....Similar to each row through a subquery to query the results obtained, are the row subquery.2. Case:MySQL version :

Linux under MySQL installation, it is recommended to use this one.Of course, you can configure the environment variable in the configuration file.Report:Mysqlinstallation-Create a mysql group-Useradd MySQL-Create a mysql user and put it in the MySQL

MYSQL optimization (continuous update) and mysql Optimization * Use MYSQL data cache to improve efficiency. Note: 1. application environment: tables that do not change frequently and the same queries for this table 2. It is not applicable to