4.2.5.1.1 Sequential Organization
The physical order in which the records are placed in the file determines the sequence of records. The relationships among records in the file do not change, except that the file can be extended. Records can be fixed-length or variable-length; there are no keys.
Each record in the file, except the first, has a unique predecessor record, and each record, except the last, also has a unique successor record.
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