BCA

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Class notes Bca (Bca 204B)
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19

December 2025

2025/2026
The architecture of a Database Management System (DBMS) can be described in two primary ways: by the system's abstract levels (the ANSI/SPARC model) and by the distribution of components across a network (tier-based architectures). The Three-Level Architecture (ANSI/SPARC Model) This model provides data abstraction by dividing the database into three levels or schemas, allowing changes at one level without affecting the others (data independence). External Level (View Level): This is the h...
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