# Requirements for Migration

__*Requirements*__

+ Before you begin migrating an `On-Premises MySQL / MariaDB` database, confirm the following:
  + You have completed all the prerequisites necessary on the target database for this migration.
  + Your source database is up and running.
  + You have planned for the complete down time during the migration process.
  + You have applied all patches, equally, to both the source and the target databases.
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Before you begin migrating an `On-Premises MySQL / MariaDB` database, be aware of the following:
- Ensure you have completed all the prerequisites necessary to enable `TiDB Cloud` Service.
- Check whether the database you want to migrate from the source `On-Premises MySQL / MariaDB` database to the target `TiDB Cloud` is up and running.
- Complete down time may occurs during the migration. we recommends that you keep the database on the source environment until migration to the target `TiDB Cloud` is complete.
- Ensure that you have applied all patches, equally, to both the source and the target databases.