A-LevelComputer ScienceSystem software9618/31 · Oct/Nov 2021 · Q56 Marks
Compare sequential and serial methods of file organisation.
- (a)Compare sequential and serial methods of file organisation.[4]
- (b)State the most suitable method of file access when a record is referenced by a unique address on a disk-type storage medium.[1]
- (c)State the most suitable method of file access when a bank stores its data records in ascending order of account number.[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2021). The mark or mark type is shown in brackets.
- [4] One mark for each correct marking point (Max 4)
- • In both serial and sequential files records are stored one after the other ... and need to be accessed one after the other
- • Serial files are stored in chronological order
- • Sequential files are stored with ordered records ... and stored in the order of the key field
- • In serial files, new records are added in the next available space / records are appended to the file
- • In sequential files, new records are inserted in the correct position.
- [1] Direct (access)
- [1] Sequential (access)
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