Export All MySQL Databases

Overview

Learn how to backup all your MySQL databases using the mysqldump command. This guide provides instructions for exporting all databases into a single file or separate files, with various options for customization.

Using mysqldump

To export all databases at once, use the command: mysqldump -u root -p --all-databases > alldb.sql. This command requires root access and will prompt for the password.

Customization Options

For enhanced performance and customization, add options like --opt for optimizations, or --skip-lock-tables to prevent locking tables during the dump. Example: mysqldump -u root -p --opt --all-databases > alldb.sql.

Monitoring Progress

To monitor the export progress, include the --verbose option: mysqldump -u root -p --opt --all-databases --verbose > alldb.sql.

Exporting to Separate Files

To export each database into its own file, use a script looping over each database with a command like: mysqldump -u root -p --databases $db > `date +%Y%m%d`.$db.sql.

Compression and Performance

Export and compress all databases in one step with: mysqldump -u [user] -p[password]--single-transaction --quick --all-databases | gzip > alldb.sql.gz, which is quick and reduces server load.

Avoiding UTF8 Issues

Be aware that exporting all databases at once may break UTF8 characters, requiring additional steps to ensure character set compatibility.

Handling Special Tables

To avoid warnings about skipping special tables like mysql.event, use the --events option explicitly.

Step by Step Guide

Start with the mysqldump command to export all databases: mysqldump --all-databases > alldb.sql. Then, use the mysql command to import them: mysql < alldb.sql.

Frequently Asked Questions

What is the command to export all databases in MySQL?

The command to export all databases in MySQL is mysqldump -u root -p --all-databases > alldb.sql.

How do I compress the exported databases when using mysqldump?

To compress the exported databases, you can use the command mysqldump -u [user] -p[password] --single-transaction --quick --all-databases | gzip > alldb.sql.gz.

Can I export all databases in MySQL to a single file?

Yes, you can export all databases to a single file by using the command mysqldump -uroot -proot --all-databases > allDB.sql.

Is there a way to export each database one by one in MySQL?

Yes, you can export each database one by one by using a script that lists the databases and runs mysqldump on each database, then compresses the exports into a zip file.

What can be the result of exporting all databases in MySQL using mysqldump?

The export command may produce a large amount of data and result in a large file.

Common Use Cases

• 
  Backing up all MySQL databases on a server
• 
  Migrating all databases from one server to another
• 
  Analyzing and auditing data across all databases for compliance
• 
  Cloning the database environment for testing purposes
• 
  Archiving historical data from all databases

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