Converting Records to Tuples (cont)
Information on how to interpret bytes in a record ...
- may be contained in schema data in DBMS catalog
- may be stored in the page directory
- may be stored in the record (in a record header)
- may be stored partly in the record and partly in the schema
For variable-length records, some formatting info ...
- must be stored in the record or in the page directory
- at the least, need to know how many bytes in each value
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