Multiple-file Disk Manager
Most DBMSs don't use a single large file for all data.
They typically provide:
- multiple files partitioned physically or logically
- mapping from DB-level objects to files (e.g. via meta-data)
Precise file structure varies between individual DBMSs.
Using multiple files (one file per relation) can be easier, e.g.
- adding a new relation
- extending the size of a relation
- computing page offsets within a relation
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