Data migrations are a necessary but often feared part of building applications on the web. Migrations can, and typically are, difficult, but if planned properly, they can be fairly painless. The following are some general guidelines to keep in mind when dealing with a migration. Note that this is not a how-to guide on doing a migration, since all migrations are unique, but these are some general guidelines to follow.
Migration Plan
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Migration Mapping
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Writing Migration Scripts
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Keep in mind
The following are some general things to keep in mind when doing these migrations.