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What is System R? What are its two major subsystems?
System R was intended and developed over a period of 1974-79 at IBM San Jose Research Center. It is a prototype and its purpose was to illustrate that it is possible to build a Relational System that can be used in a real life environment to solve real life problems, with performance at least comparable to that of existing system.
Its two subsystems are
Research Storage
System Relational Data System.
Define Specialisation and generalization in brief? Specialisation / generalization: Generalization or Specialization represents the is a relationship set, an necessary element
The issues relating to the Design of the Physical Database Files Physical File is a file as stored on the disk. The major issues relating to physical files are: • Cons
What is NULL? Simply NULL means not in value.
Describe Database state in details? Database state: The actual data within the database at a particular moment in time is known as a database state.
Define the notation for classes and atrributes The notation for class, attribute, and operations are shown below: Figure: Class with attributes and operations A
Explain the term- Periodic recomputation Periodic recomputation: Base values are often updated in bunches. Sometimes, it is possible to just recompute all derived attributes p
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Why DML is used for? DML is used to Manipulation and processing of database. DML is provided for manipulation & processing of database. (Data stored in the database is processed
Define a property that is not a property of transactions? Ans: Concurrency is not a property of transactions
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
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