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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.
Given the following set of functional dependencies {cf→ bg, g → d, cdg → f, b → de, d → c} defined on R(b,c,d,e,f,g) a. Is cf→ e implied by the FDs? b. Is dg a superkey?
explain in detail about time stamp orderting/
What is meant by Physical blocks? The input and output operations are completed in block units. The blocks residing on the disk are referred to as physical blocks.
Consider the following six relation schemes and their corresponding sets of functional dependencies. In each case identify a. All the candidate keys b. The highest normal for
recovey techniques based on deferred update and immediate update
What are the two main goals of parallelism? Load -balance multiple small accesses, so that the throughput of such accesses enhances. Parallelize large accesses so that the res
does tables are called relations
Consider the following relational scheme: R (a,b,c,d,e,f) and its corresponding set of FDs {d→ a, be → c, ac → e, b → f, f → d, a → c}. a. Is the following decomposition i) non
In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
Explain in details about the f unctions of DBA ?
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