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Question:
a) There are three concurrency problems, i.e. three types of potential mistake which could occur if concurrency control is not properly enforced in the database system. Briefly explain each of these concurrency problems.
(b) Locking can be used to solve the three concurrency problems, but it can also produce the problem of deadlock. What is deadlock? Briefly explain how the problem of deadlock can be handled.
growing phase and shrinking phase are disjoint, why ?
Question : (a) Explain with the help of appropriate examples the difference between ‘Data' and ‘Information'. (b) A digital image is an array of pixels, where each pixel h
The Third Normal Form (3NF) Even though, transforming a relation that is not in 2NF into a number of relations that are in 2NF take out many of the anomalies, it does not neces
Why containment is important in oosystems? Containment is an significant concept in oosystems because it allows dissimilar users to view data at different granularities.
Consider a relation s over the attributes A and B with the following characteristics: 5,000 tuples with 10 tuples per page A 2-level B+ tree index on attribute
What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
Properties of a Transaction A transaction has four main properties. These are: Atomicity Consistency Isolation or Independence Durability or Permanen
Serialisability: Any schedule that makes the similar results as a serial schedule is known as a serialisable schedule. But how can a schedule are determined to be serialisable or n
If R1 and R2 are two relations or functions, then the result of R3 = R1 × R2 is the combination of tuples that are in R1 and R2. The product is associative and commutative. Degr
In the first unit of this block, you have been given with the details of the Database Management System, its structure, advantages etc. This unit is an attempt to give you informat
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