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Documentation: reference/reference_lua/box_schema/upgrade

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	box.schema.upgrade()
	If you created a database with an older Tarantool version and have now installed a newer version, make the request ``box.schema.upgrade()``. This updates Tarantool system spaces to match the currently installed version of Tarantool. You can learn about the general upgrade process from the :ref:`Upgrades <admin-upgrades>` topic.
	For example, here is what happens when you run ``box.schema.upgrade()`` with a database created with Tarantool version 1.6.4 to version 1.7.2 (only a small part of the output is shown):
	tarantool> box.schema.upgrade() alter index primary on _space set options to {"unique":true}, parts to [[0,"unsigned"]] alter space _schema set options to {} create view _vindex... grant read access to 'public' role for _vindex view set schema version to 1.7.0 --- ...
	You can also put the request ``box.schema.upgrade()`` inside a :doc:`box.once() </reference/reference_lua/box_once>` function in your Tarantool :ref:`initialization file <index-init_label>`. On startup, this will create new system spaces, update data type names (for example, ``num`` -> ``unsigned``, ``str`` -> ``string``) and options in Tarantool system spaces.
	See also: :ref:`box.schema.downgrade() <box_schema-downgrade>`

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