How to export different data in mysql

1. Database backup and export

Before performing data migration, we need to back up the database to be migrated. In MySQL, you can use mysqldump to backup and export data.

To export data from the database to a file, you can use the mysqldump command to export the entire database, a single table, or specified data. The specific command is as follows:

mysqldump -u root -p database_name > backup.sql

This command includes the username parameter "-u" and the password parameter "-p", followed by the name of the database to be backed up, and finally output it to the backup file. After completing the backup, we can migrate the backup files to another MySQL server and import the data into the new database.

2. Database import and recovery

In the MySQL command line, you can use the following command to import data into a new database:

mysql -u root -p database_name < backup.sql

Among them, -u is the username parameter, -p is the password parameter, followed by the name of the database that needs to be imported, and then import the data by entering the path of the backup file. Please note that if the name of the imported database is different from the name of the backup database, you need to manually modify the database name in the export file.

3. Use data synchronization tool

When migrating a large amount of data, manual backup and import will be very troublesome. At this time we can use some data Synchronization tools for fast, automated data migration.

Data synchronization tools can automatically realize synchronization between two databases. There are mainly the following tools:

• MySQL Replication: This is the one that comes with MySQL The replication method can synchronize data on one MySQL server on another server to achieve mirror replication of data, and supports multiple slave databases to back up and read data from the master database at the same time. However, it must be noted that if the primary database fails, the backup in the standby database may be affected.

• SymmetricDS: SymmetricDS is a free, open source data synchronization tool that can help us synchronize data between multiple databases. Different from MySQL Replication, SymmetricDS not only supports MySQL, but also supports MS SQL, Oracle, PostgreSQL, DB2 and other databases. In addition, it also provides many advanced features, such as supporting two-way synchronization between databases, supporting load balancing, supporting automated deployment, etc. It is a very powerful and flexible data synchronization tool.

• Percona Xtrabackup: Percona Xtrabackup is a backup and recovery tool for MySQL databases. It can perform hot backup of MySQL databases without affecting the normal operation of MySQL. Compared with traditional hot backup methods, Percona Xtrabackup can back up data more quickly and reliably, and can improve the efficiency of data migration.

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