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25 lines
1.1 KiB
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====================================
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Online SQL schema migration examples
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====================================
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This document links to several examples implementing online SQL schema
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migrations to facilitate simultaneously running OpenStack services in
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different versions with the same DB schema.
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* Nova `data migration example
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<http://specs.openstack.org/openstack/nova-specs/specs/kilo/implemented/flavor-from-sysmeta-to-blob.html>`_
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* Nova `data migration enforcement example
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<https://review.openstack.org/#/c/174480/15/nova/db/sqlalchemy/migrate_repo/versions/291_enforce_flavors_migrated.py>`_
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of sqlalchemy migrate/deprecated scripts
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* Nova `flavor migration spec
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<http://specs.openstack.org/openstack/nova-specs/specs/kilo/implemented/flavor-from-sysmeta-to-blob.html>`_
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example of data migrations in the object layer
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* Cinder `online schema upgrades spec <https://specs.openstack.org/openstack/cinder-specs/specs/mitaka/online-schema-upgrades.html>`_
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example of migrating a column to a many-to-many relation table
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For documentation on how to make online migrations move on to
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:ref:`Database Schema Migrations <online-migration>`.
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