如何同時匯出和匯入多個MySQL資料庫？

Exporting and Importing Multiple MySQL Databases Simultaneously

Managing multiple MySQL databases can become cumbersome when it comes to backing up data or migrating databases to a different server. Fortunately, MySQL provides efficient commands to export and import multiple databases at once, simplifying the process significantly.

Exporting All Databases

To export all MySQL databases on your server, the following command can be used:

mysqldump -u root -p --all-databases > alldb.sql

Here, replace 'root' with the username and enter the password when prompted. The output of this command is a single SQL file named 'alldb.sql' containing all the database schemas and data.

Various options can be used with mysqldump to customize the export process. Here are a few commonly used options:

• --opt: Optimizes the dump process, reducing the size of the output file.
• --skip-lock-tables: Avoids locking tables during the export, allowing concurrent operations on the databases.

Importing All Databases

Once the databases have been exported, use the following command to import them all back into MySQL:

mysql -u root -p < alldb.sql

Enter the password when prompted. This command imports the data and schema defined in 'alldb.sql' into your MySQL server.

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