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box.schema.downgrade()
Allows you to downgrade a database to the specified Tarantool version. This might be useful if you need to run a database on older Tarantool versions.
To prepare a database for using it on an older Tarantool instance, call ``box.schema.downgrade`` and pass the desired Tarantool version:
tarantool> box.schema.downgrade('2.8.4')
The Tarantool's downgrade procedure is similar to the upgrade process that is described in the :ref:`Upgrades <admin-upgrades>` topic. You need to run ``box.schema.downgrade()`` only on master and execute `box.shapshot()` on every instance in a replica set before restart to an older version.
To see Tarantool versions available for downgrade, call :ref:`box.schema.downgrade_versions() <box_schema-downgrade_versions>`. The oldest release available for downgrade is ``2.8.2``.
Note that the downgrade process might fail if the database enables specific features not supported in the target Tarantool version. You can see all such issues using the :ref:`box.schema.downgrade_issues() <box_schema-downgrade_issues>` method, which accepts the target version. For example, ``downgrade`` to the ``2.8.4`` version fails if you use `tuple compression <https://www.tarantool.io/en/enterprise_doc/tuple_compression/>`__ or field :ref:`constraints <index-constraint_functions>` in your database:
tarantool> box.schema.downgrade_issues('2.8.4')
---
- - Tuple compression is found in space 'bands', field 'band_name'. It is supported
starting from version 2.10.0.
- Field constraint is found in space 'bands', field 'year'. It is supported starting
from version 2.10.0.
...
See also: :ref:`box.schema.upgrade() <box_schema-upgrade>`

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testing_project / Documentation: reference/reference_lua/box_schema/downgrade — English

tarantool> box.schema.downgrade_issues('2.8.4')
---
- - Tuple compression is found in space 'bands', field 'band_name'. It is supported
starting from version 2.10.0.
- Field constraint is found in space 'bands', field 'year'. It is supported starting
from version 2.10.0.
...
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