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Data and File Structure
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A-set type access paths ADABAS ANSI application program association attribute B-tree binary relation bucket candidate key chapter clause Cobol Codasyl model columns component conceptual schema concurrent data item data models data resource data structures DBCS DBMS defined deleted dependent disc accesses DM commands DNAME entity record entry example external schema facilities foreign key format given hash slot hence host language implementation index table inserted integrity internal identifiers join key order LOCKR locks log file log records member record node normal form normalisation optimisation option overflow owner record physical pointers primary key primary key values query record type relational algebra relational model relationship reorganisation repeating group retrieval run-unit sequential set selection set type shown in figure specified storage record storage schema stored student subschema technique third normal form TNAME tuple TUTOR unique