What is the System Idle process, and what does its value mean?
What will be an ideal response?
When the operating system is not busy, the kernel schedules the System Idle process with the CPU time. Therefore, a high value for the system idle process would mean that the CPU is not busy. A low value would mean that the CPU is busy with other processes.
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Chained exceptions are useful for finding out about ________.
a. exceptions thrown using the chained keyword. b. checked exceptions only. c. an original exception that was caught before the current exception was thrown. d. the current exception’s chain of superclasses.
Formulate the following queries using SQL (the answers to these queries in relational algebra, tuple relational calculus, and domain relational calculus were given in the previous section):
relational database contains details about journeys from Paisley to a variety of destinations and contains the following relations: Operator (opCode, opName) Journey (opCode, destinationCode, price) Destination (destinationCode, destinationName, distance) Each operator is assigned a unique code (opCode) and the relation operator records the association between this code and the operator’s name (opName). Each destination has a unique code (destinationCode) and the relation destination records the association between this code and the destination name (destinationName), and the distance of the destination from Paisley. The relation Journey records the price of an adult fare from Paisley to the given destination by as specified operator, several operators may operate over the same route. (a) List the details of journeys less than £100. (b) List the names of all destinations. (c) Find the names of all destinations within 20 miles. (d) List the names of all operators with at least one journey priced at under £5. (e) List the names of all operators and prices of journeys to ‘Ayr’. (f) List the names of all destinations that do not have any operators.
The SUM function calculates the average value of a specified range of cells or values.
Answer the following statement true (T) or false (F)
IrDA links are direct ______________ and are susceptible to interference.
Fill in the blank(s) with the appropriate word(s).