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(a) Explain the three types of potential mistake which could occur if concurrency control is not properly enforced in the database system. Support your answer with appropriate example for each.
(b) Explain the data access protocol based on the compatibility matrix.
(c) Describe "deadlock" and give an example.
(d) Describe how a deadlock state can be detected and how the system can break such a state.
Describe multi key files
Define a relation ? Relation - A relations is a named two-dimensional table of data. Mathematically, a relation can be described as a subset of the cartesian product of a lis
what is RDBMS? how it works? good example.
Differentiate OO development from structured development. Structured approach of problem solving is based upon the idea of decomposition of system into subsystem. In this appro
Suppose an instruction takes 1 nanosecond to execute (on average), a page fault takes 20 microseconds of processor time, and it takes 300 microseconds of disk time to read or write
What are the Constituents of File? Also elaborates all the possible file operations? A file is organised logically as sequence of record. These records are mapped onto disk blo
what are information system hirarchy?
DROP TABLE Command: When an existing object is not needed for further use, it is always better to eliminate it from the database. To remove the existing object from the databas
what do you mean by consistency in rdbms?
sql is relationally complete-justify
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