MySQL

MySQL data type and table structureDb,database-Databases: Data collections that are organized and placed into memory according to a data model.Dnms,database Management System-Database management system: a large-scale service software used to

View current MySQL-supported storage enginesShow engines;View permissions for a userShow grants for UserName;How to know the current binary log file and position valueShow master status;What command to switch binary LogFlush logs;What command to

DAY05 Incremental BackupFirst, enable Binlog log for real-time incremental backupSecond, the use of 3rd-party software provided by the command to do incremental backup+++++++++++++++++++++++++++++++++First, enable Binlog log for real-time

Brief introduction:? Xtrabackup contains two main tools, namely: Xtrabackup and Innobackupex? Xtrabackup: You can only back up tables of the InnoDB and XTRADB two transaction engines and do not support backing up tables for non-transactional engines.

INNER JOIN (INNER join) (a typical join operation, using a comparison operator like = or <>). Includes both equal and natural connections. Inner joins use comparison operators to match rows in two tables based on the values of the columns that are

(1) Examination of basic written order1. Turn on MySQL service/etc/init.d/mysqld startService mysqld StartSystemctl Start mysqld2. Detect if the port is runningLsof-i: 3306Netstat-lntup |grep 33063. Set a password or change the password for MySQLSet

0, Introduction20180125 days, Busy! The blind man summed up, to satisfy this is a diary of the appearance.1, today is not talking about technology "of course, there is no technology (all very basic)" but the blind few pull.First, about a kind of

9.10.3 preliminary incremental recovery MySQL data combatA. Rename the Log-bin parameter in the MY.CNF configuration file to MYSQLBIN_ZBF, so that updating a thing in the MySQL database will be updated in this log. This will cause this log to be

1) Delete UserDelete from user where user= ' sss ' and host= ' localhost ';Drop User SSSFlush Privileges2) New UserCREATE USER ' user_name ' @ ' host ' identified by ' password ';USER_NAME: To create the user's name.Host: Indicates to which machine

InnoDB:Support transaction processing, etc.No lock ReadSupport for foreign keysSupport Row lockIndex of type Fulltext not supportedDo not save the table's exact number of rows, scan the table to calculate how many rowsDelete Table is a row of

Phenomenon:Start MySQL database prompt:Failed to start mysqld.service:Unit not foundReason:Know:Why did CentOS 7 abandon MySQL and use mariadb?Baidu:Solution:Install MySQL author from the Open source version: Maria DB(Maria DB is like a shadow

9.9.7.8 inserting data into a table(1) Command syntaxInsert into[([...])]values (value 1) [, (value N)](2) Create a simple test table test1Create Table: CREATE TABLE `test1` ( `id` int(4) NOT NULL AUTO_INCREMENT, `name` char(20) NOT NULL, PRIMARY

9.9 Table Operation9.9.1 building a library with the default character setIn the default format, specify the character set to build the library[email protected] 07:0205->create database wwn;Query OK, 1 row affected (0.00 sec)[email protected] 07:0339

5.1 MySQL Multi-instance Introduction5.1.1 What is MySQL multi-instance?To put it simply, multiple different service ports (such as 3306,3307) are opened on a single machine, running multiple MySQL service processes that provide their own services

Add userLog in to the database as the root user and run the following command:create user zhangsan identified by ‘zhangsan‘;The above command creates the user Zhangsan, and the password is Zhangsan. In the Mysql.user table you can see the

Before describing Python's operations in the database, let's briefly introduce the operating language in MySQL:[[Email protected]2018- on- -]# Mysql-u Root-Penter Password:welcome to the MySQL Monitor. Commands End With; or \g.your MySQL

one of the most important features of MySQL database that differs from other databases is its plug-in table storage engine , which is table-based. Rather than the databaseInnoDB Storage Engine:???? support transactions, which are designed primarily

Implementation principle of MySQL transaction isolation level, mysql transaction isolation levelReview Among the many storage engines of MySQL, only InnoDB supports transactions. The transaction isolation level mentioned here refers to the

Mysql Manual's bug in modifying column character encoding, mysqlbug The project uses GBK encoding for historical reasons. garbled characters are not encoded in GBK format. This is a serious issue. We plan to modify the column's character encoding to

Mysql user management and permissions, mysql user management Permissions 1. Set the password Set password for username @ localhost = password ('Password '); 2. Cancel the password Set password for username @ localhost = password (''); 3. Create