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These issues may or may not be relevant depending on your application and its availability requirements.
What you need to know when writing complex migrations
Tarantool has a transaction mechanism. It is useful when writing a migration, because it allows you to work with the data atomically. But before using the transaction mechanism, you should explore its limitations.
For details, see the section about :doc:`transactions </concepts/atomic>`.
How you can apply migration
The migration code is executed on a running Tarantool instance. Important: no method guarantees you transactional application of migrations on the whole cluster.
**Method 1**: include migrations in the application code
This is quite simple: when you reload the code, the data is migrated at the right moment, and the database schema is updated. However, this method may not work for everyone. You may not be able to restart Tarantool or update the code using the hot-reload mechanism.
**Method 2**: tarantool/migrations (only for a Tarantool Cartridge cluster)
This method is described in the README file of the `tarantool/migrations <https://github.com/tarantool/migrations>`_ module.
There are also two other methods that we **do not recommend**, but you may find them useful for one reason or another.
**Method 3**: the :ref:`tt <tt-cli>` utility
Connect to the necessary instance using ``tt connect``.
$ tt connect admin:password@localhost:3301
If your migration is written in a Lua file, you can execute it using ``dofile()``. Call this function and specify the path to the migration file as the first argument. It looks like this:
tarantool> dofile('0001-delete-space.lua')
---
...
(or) Copy the migration script code, paste it into the console, and run it.
You can also connect to the instance and execute the migration script in a single call:
$ tt connect admin:password@localhost:3301 -f 0001-delete-space.lua
**Method 4**: applying migration with Ansible
If you use the `Ansible role <https://github.com/tarantool/ansible-cartridge>`_ to deploy a Tarantool cluster, you can use ``eval``. You can find more information about it `in the Ansible role documentation <https://github.com/tarantool/ansible-cartridge/blob/master/doc/eval.md>`_.

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testing_project / Documentation: concepts/data_model/migrations — English

tarantool> dofile('0001-delete-space.lua')
---
...
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