MySQL 8.0 data backup and recovery

Although some management measures have been taken to ensure the security of the database , However, uncertain accidents are always likely to cause data loss , For example, accidental power failure 、 Careless operation errors of the administrator may cause data loss . One of the most important measures to ensure data security is to ensure that data is backed up regularly . If the data in the database is lost or an error occurs , Backup data can be used for recovery , In this way, the loss caused by unexpected causes is reduced as much as possible . Data backup will be introduced 、 Data recovery 、 Relevant knowledge of data migration and data import and Export .

PART1. The data backup

Data backup is one of the most important tasks of Data Administrators . Accidental system crash or hardware damage may lead to the loss of the database , therefore MySQL Administrators should back up databases regularly , So that when an accident happens , Minimize losses . Data backup is 3 Methods .

1. Use MySQLdump Command backup

MySQLdump yes MySQL Provides a very useful database backup tool .MySQLdump When the order is executed , The database can be backed up as a text file , This file actually contains several CREATE and INSERT sentence , Use these statements to recreate tables and insert data .

mysqldump  -u user -h host -ppassword dbname[tbname, [tbname...]]>filename.sql

user Represents the user name ;host Indicates the host name of the login user ;password Is the login password ;dbname Name of the database to be backed up ;tbname by dbname The database that needs to be backed up , You can specify multiple tables that need to be backed up ; Right arrow symbol ”>“ tell MySQLdump Write the definition and data of the backup data table to the backup file ;filename.sql Is the name of the backup file .

1. Use MySQLdump Back up all tables in a single database

Just to understand MySQLdump How tools work , Here is a complete database example . Log in first MySQL, Create according to the following database structure booksDB Database and tables , And insert the data record .

Be careful ： Here's a guarantee C Under the plate backup Folder exists , Otherwise, an error message will be prompted ： The system could not find the specified path .

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