Page Formats
Ultimately, a Page is simply an array of bytes (byte[]).
We want to interpret/manipulate it as a collection of Records.
Typical operations on Pages:
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request_page(pid) ... get page via its PageId
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get_record(rid) ... get record via its TupleId
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rid = insert_record(pid,rec) ... add new record
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update_record(rid,rec) ... update value of record
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delete_record(rid) ... remove record from page
Note: rid contains (PageId,TupIndex), so no explicit pid needed
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