CSC 4402 20091012

CSC 4402 20091012 - CSC 4402 Page 1 of 5 Midterm review...

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CSC 4402 10/12/2009 Page 1 of 5 Midterm review Summary of contents covered before the midterm Chapters 1 – 4. Part 1 – Basic concepts – Chapter 1 Part 2 – The Relational Data model – Chapter 2 Part 3 – SQL – Chapters 3, 4 Part 1 – Basic concepts Chapter 1 – can skip sections 1.7, 1.9, 1.10 Homework 1 outlines the major concepts covered, but we’ll list them here anyway: Database systems o A set of data files o A set of programs for accessing the data files Main objectives o Environment for efficient and convenient access to data Data integration o Reduced redundancy o Ease of access Data integrity o Error free o Correctness of data Data sharing o Concurrent access to data DBMS (definition of) DBA (definition of, responsibilities) Advantages of DBMS vs. traditional file system approach o Reduced redundancy o Avoid data inconsistencies o Concurrency o Avoids data isolation o Better data security o Better integrity constraint supports o Convenient and efficient data access o Atomicity o Better support for data abstraction The ANSI/Sparc 3-level architecture. The main purpose of the 3-level architecture is to (i) provide data abstraction/independence and (ii) efficient access to data o View closest to the user individual user perspective
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CSC 4402 10/12/2009 Page 2 of 5 o Logical what data is in the db (schema) o Physical where data is actually stored and retrieved from files
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