Why is there no explicit data-typing in CORBA CDR?
What will be an ideal response?
The use of data-typing produces costs in space and time. The space costs are due to the extra type information
in the marshalled form (see for example the Java serialized form). The performance cost is due to the need to
interpret the type information and take appropriate action.
The RMI protocol for which CDR is designed is used in a situation in which the target and the invoker
know what type to expect in the messages carrying its arguments and results. Therefore type information is
redundant. It is of course possible to build type descriptors on top of CDR, for example by using simple strings.
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Explain how DMA improves system performance. and cycle stealing.
What will be an ideal response?
In SQL, specify the following queries on the database specified in Figure 3.5 using the concept of nested queries and the concepts described in this chapter.
a. Retrieve the names of all employees who work in the department that has the employee with the highest salary among all employees. b. Retrieve the names of all employees whose supervisor’s supervisor has '888665555' for Ssn. c. Retrieve the names of employees who make at least $10,000 more than the employee who is paid the least in the company.
Which of the following is an undocumented and illicit point of entry into an operating system or application added by a system's programmers to bypass normal security?
A. back door B. hole C. discovery D. hash
A strong password contains ________
A) upper-case letters and numbers B) numbers and symbols C) upper- and lower-case letters, numbers, and symbols D) upper- and lower-case letters