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Juventud en Guatemala

Jennifer Morales

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Database Enviroment

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Part 2

Mind Map by yuroshyini1719, updated more than 1 year ago

	Created by yuroshyini1719 over 9 years ago

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Database Enviroment

ANSI-SPARC
1. American National Standards Institute, Standards Planning And Requirements Committee.
2. standard for DBMS
3. Levels
  1. External
    1. user view
  2. Conceptual
    1. community view
  3. Internal
    1. physical representation of DB
Advantages
1. customized user view
2. hides physical storage details from users
3. changes by DB admin doesn't effect user view
Data Model
1. documentation for data org.
2. Record- Based
  1. Network
  2. Hierarchial
  3. Relational
3. Object- Based
  1. Entity-Relationship
  2. Functional
  3. Object-Oriented

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