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What are the reasons for having variable length records? What are the various ways to store variable length records?
Variable-length records arise in a database in various ways:
(i)Storage of multiple items in a file. (ii)Record types allowing variable field size (iii)Record types allowing repeating fieldsVarious ways of storing variable length records:
(i) In fixed form through allocating every record, maximum amount of space in which can be occupied a record and padding smaller sized records along with nulls. (ii) Special separator characters among the records to delineate variable length records.
Illustrate how you can use QBE to perform logical AND and OR operation
PART MARKING: We will only mark TWO of the four questions below but you must submit answers to all four. We will choose the questions we mark randomly and we will supply you with
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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 ex
Write short notes on domain relational calculus The domain relational calculus uses domain variables that take on values from an attribute domain rather than values for whole
1. Will you advise that your organization uses open source software and why? 2. Why is it important for business managers to have a basic understanding of the software development
Although how will the system recover The selection of REDO or UNDO for a transaction for the recovery is completed on the basis of the state of the transactions. This state is
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.
Which two tools are used to administer users for Active Directory?
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