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Three Level Architecture of DBMS or Logical DBMS Architecture
The logical architecture defines how data in the database is perceived by users. It is not deals with how the data is handled and processed by the DBMS, but only with how it looks. The process of data storage on the underlying file system is not revealed, and the users can influence the data without worrying about where it is located or how it is really stored. This results in the database having dissimilar levels of abstraction.
The majority of commercial Database Management Systems available today are based on the SPARC / ANSI generalised DBMS architecture, as proposed by the SPARC / ANSI Study Group on Data Base Management Systems. Therefore, this is also called as the SPARC / ANSI model. It separates the system into three levels of abstraction: the physical or internal level, the conceptual level, and the view or external level.
Briefly explain each of the following database terms. Use no more than 2-3 lines for each term. 1. DBMS 2. Update Anomaly 3. Alias (referring to tables in SQL queries)
Chapter 10a review questions
In E-R diagram how generalization is represented? in E-R diagram generalization is represented by Triangle shape.
it can be possible to create any table without primary key
What is a transaction ? The Transaction is a unit of data processing. For instance, many of the transactions at a bank may be withdrawal or deposit of money; transfer of money f
The database will enable college administrators the ability to track students initial major. This will help college officials decide how best to prepare students for their goals an
Representing complex relationship among data A database may contain varieties of data interrelated to each other in numerous ways. A DBMS must have the capability to represent
Query Processor The query language processor is responsible for taking query language statements or shifting them from the English-like syntax of the query language to a form
Explain trivial dependency? Functional dependency of the form α ->β. is trivial if α C β. Trivial functional dependencies are satisfied by all the relations.
Homework chapter 10 no 3
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