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What is trigger Triggers are statements that are implemented automatically by the system as the side effect of a change to the database.
Define an operator that a Relational Algebra does not have Ans: Relational Algebra does not have Aggregation operators.
Explain the Static or conservative Two Phase Locking: Static (or conservative) Two Phase Locking: In this type of scheme, all the data items are locked earlier than any opera
Set Difference If R1 and R2 are two union compatible relations or relations then result of R3 =R1- R2 is the relation that have only those tuples that are in R1 but not in R2.
Explain DML with some examples? DML - Data Manipulation Language: statements used for managing data within schema objects. Some examples: • SELECT - retrieve data from the a da
Describe the various types of Online Analytical Processing (OLAP) tools and briefly discuss how the support common analytical operations.
Define- relational algebra. The relational algebra is a procedural query language. It having of a set of operations that take one or two relation as input and make a new relati
Define average seek time. The average seek time is the average of the seek times, calculated over a sequence of random requests.
Question: (a) List four disadvantages of the File Processing System as compared to the Database Systems. (b) The integrity of a database is enforced by integrity rules. One
Identification of concurrency Identification of concurrency: Dynamic model identifies concurrency. Two objects are said to be parallel (concurrent) if they can receive events a
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