a random presentation.

1. Topic: Data Dictionary
Name: Souvik Roy
University Roll No: 11700220036
Paper Name: Database Management System
Paper Code: PCCC601
Continuous Assessment – 1 (Academic Session: 2022 – 2023)
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2. WHAT IS A DATA DICTIONARY?
 A DATA DICTIONARY IS AN INTEGRAL PART OF DATABASE.
IT HOLDS INFORMATION ABOUT THE DATABASE AND THE DATA THAT
IT STORES, i.e. the META-DATA.
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3. NECESSITY OF A DATA DICTIONARY
• Since DATABASE is meant to be built and used by multiple users,
making sure that everyone is aware of what types of data each field
will accept becomes a challenge.
• So a DATA DICTIONARY is effective add on to ensure data consistency.
• It is a tool for recording and processing (metadata) about the data
that an organization uses.
• May be referenced during system design, programming, and by
actively-executing programs.
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4. Structure Of Data Dictionary
• DD can be integrated with the DBMS or stand-alone
• Relational systems all have some form of integrated DD (e.g., Oracle).
• Integrated DD is usually active, meaning it is automatically updated to reflect changes in the
database.
• A stand-alone DD is not directly linked to the database and must be updated manually.
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5. Conclusion
• A DDS is a useful management tool, but at a price. The DDS ’project’
may itself take two or three years. It needs careful planning, defining
the exact requirements.
• However it exudes clarity on the rest of the Database Documentation.
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6. References
• Slideshare.net/DBMS-lecture-6
• Slideshare.net/DBMS-lecture-5
• Wickipedia.org/Data-Dictionary-DBMS
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