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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