MySQL

1. Open MySQL workbench and select "create eer model from existing database" in the middle of the homepage "data modeling ";2. Select "manage stored connections..." in "stored connection ...";3. Select "new" in manage dB connections to create a

Root @ DB-02 ~] # Mysql-u Root-Bash: mysql: Command not found Cause: by default, the system will find the command under/usr/bin. If this command is not in this directory, of course, the command cannot be found, what we need to do is map a link to

1. index creation time: it is worthwhile to create an index for a field in select, filter, and sort conditions. 2. For Fuzzy queries like '% XXX', normal indexes cannot be satisfied, and full-text indexes must be created. 3. if there are

To replace part of a field, use the update statement: UPDATE table name SET field name = REPLACE (REPLACE the previous field value, 'replace the previous keyword ', 'replace the previous keyword') WHERE field name REGEXP "REPLACE the previous

In Windows, the following ERROR occurs during mysql Logon: ERROR 1045: Access denied for user: 'root @ localhost' (Using password: YES) I found some solutions from the Internet and finally got a solution. Now I want to record the specific

The development environment of a company is usually deployed on the Intranet, and then there will be public servers for developers and tests. Therefore, there is often a need to connect to the server through ssh or a local mysql client, in my

How can I use a command line to access mysql? I have not seen a friend raise such a question on the Forum recently. Some netizens have also given the answer, and I would like to share it with you here! A free version of software for converting

MySQLTuner: http://github.com/rackerhacker/MySQLTuner-perl MySQLTuner usage:Downloading and using MySQLTuner is actually a very simple process: Wget mysqltuner. plPerl mysqltuner. pl If you 'd rather not invoke perl every time, just make it

Relational databases depend on primary keys, which are the foundation of the Physical Mode of databases. The primary key has only two purposes on the physical layer: Uniquely identifies a row.As an object that can be effectively referenced by a

1. Install Nginx One command:USE = fastcgi emerge nginx Create a user and a group:Groupadd wwwUseradd www-g www After Nginx is installed, the nginx group and nginx users are added by default. However, I still prefer to create a www group and www

We know that mysqli is a new MySQL interface provided in PHP 5, which uses the object-oriented idea. The code using the mysqli interface is more readable, and its execution efficiency is higher than that of the mysql interface. In addition, mysqli

Note: in mysql, ROW_COUNT () can return the number of rows affected by the previous SQL UPDATE, DELETE, and INSERT operations. MySQL test (database version: 5.1.22 ): 1. Create a database table: Copy codeThe Code is as follows: create table t (

1. Introduction In the Web application architecture, the data persistence layer (usually a relational database) is a key core component and has a very important impact on the system performance. MySQL is currently the most widely used open-source

1. query help? Contents2. Use the merged hash value to separate BLOB or TEXT3. Number of points used for currency (decimal or numberic)4. SQL _mode?5. order by rand () limit 1000;6. Optimize show status like 'com' Com_select Com_insert and so on to

1. Create the path to save the mysql backup file/mysqldata # Mkdir/mysqldata 2. Create the/usr/sbin/bakmysql file.# Nano/usr/sbin/bakmysql Input:Copy codeThe Code is as follows :#! /Bin/shName = 'date + % Y % m % d'Mysqldump --

I. concept:① Database Synchronization (master-slave synchronization-write data to the slave server while writing data to the master database)② Database Synchronization (master-master synchronization-two database servers write data to each other) Ii.

I. concept: ① Database Synchronization (master-slave synchronization-write data to the slave server while writing data to the master database)② Database Synchronization (master-master synchronization-two database servers write data to each other) Ii.

Environment MySQL 5.1 + command line tool Problem MySQL table field settings Default Value Solution Copy codeThe Code is as follows: -- SQL: Create table test ( I _a int NOT NULL DEFAULT 1, Ts_ B timestamp NOT NULL DEFAULT NOW (), C_c char (2)

If the database in use suddenly has some class problems Run the following command in Linux. Of course, you need to find your mysql directory. LinuxCopy codeThe Code is as follows:/usr/local/mysql/bin/mysqladmin-u root-p flush-tables WindowsRun lush-

Edit the my. cnf or my. ini file and remove the comments of the following lines of code: Copy codeThe Code is as follows: log_slow_queries =/var/log/mysql/mysql-slow.log. Long_query_time = 2 Log-queries-not-using-indexes This will record slow