🗊 Презентация Hierarchy Data Model

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Lecture 3. Hierarchy Data Model National Aviation University Computer Science Faculty Department of Software Engineering
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Lecture 3. Hierarchy Data Model National Aviation University Computer Science Faculty Department of Software Engineering

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CONTENTS Definition of the data model Hierarchy data structure Hierarchy data structure operations Integrity constraints Advantageous and drawbacks
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CONTENTS Definition of the data model Hierarchy data structure Hierarchy data structure operations Integrity constraints Advantageous and drawbacks

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Data model definition Data structure Operations Integrity constraints
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Data model definition Data structure Operations Integrity constraints

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Field and Segment Graphic notation:
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Field and Segment Graphic notation:

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Hierarchy Data Schema every segment has 0 or 1 parent segment and 0 or more child segments; root do not have parent segment; leaves do not have child...
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Hierarchy Data Schema every segment has 0 or 1 parent segment and 0 or more child segments; root do not have parent segment; leaves do not have child segments; twin segments have the same parent segment.

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Hierarchy Data Schema (2)
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Hierarchy Data Schema (2)

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Hierarchy Data Schema (3)
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Hierarchy Data Schema (3)

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Hierarchy Schema Instance (1) Integrity constraints: Every instance of a segment is connected with the only instance of its parent segment. Instance...
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Hierarchy Schema Instance (1) Integrity constraints: Every instance of a segment is connected with the only instance of its parent segment. Instance of any segment cannot exist without connection to the instance of its parent segment.

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Hierarchy Schema Instance (2)
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Hierarchy Schema Instance (2)

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Hierarchy Data Structure
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Hierarchy Data Structure

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Hierarchy Data Base
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Hierarchy Data Base

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Hierarchy Data Structure Operations Data selection: GET UNIQUE GET NEXT GET NEXT WITHIN PARENT Data manipulation: INSERT GET HOLD REPLACE DELETE
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Hierarchy Data Structure Operations Data selection: GET UNIQUE GET NEXT GET NEXT WITHIN PARENT Data manipulation: INSERT GET HOLD REPLACE DELETE

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Data selection (1)
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Data selection (1)

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Data selection (2)
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Data selection (2)

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Data selection (3)
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Data selection (3)

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Data selection (4)
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Data selection (4)

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Data manipulation (1)
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Data manipulation (1)

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Data manipulation (2)
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Data manipulation (2)

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Data manipulation (3)
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Data manipulation (3)

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Hierarchy data model advantages Advanced low level facilities to control of data in external memory An opportunity of efficient usage of the memory...
Описание слайда:
Hierarchy data model advantages Advanced low level facilities to control of data in external memory An opportunity of efficient usage of the memory An opportunity to implement an efficient application systems

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Hierarchy data model disadvantages Low level of data query and manipulation language Asymmetric search of symmetric queries It is difficult to...
Описание слайда:
Hierarchy data model disadvantages Low level of data query and manipulation language Asymmetric search of symmetric queries It is difficult to develop user "friendly " interface Anomalies of data insertion, deletion and updating Data duplication It is difficult to implement flexible mechanisms of data protection, integrity, consistency

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