The Windows Start screen displays thumbnails of Office sample documents
Indicate whether the statement is true or false.
Answer: FALSE
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Consider the schedule of two bank withdrawal transactions shown in Figure 21.13 for which SNAPSHOT isolation leads to an inconsistent database. Suppose that the bank encodes, as an integrity constraint in the database schema, the business rule “The sum of the balances in all accounts owned by the same depositor must be nonnegative.” Then that particular schedule cannot occur.
Although the integrity constraint is nowmaintained, the specification of a particular transaction might assert that when the transaction commits, the database state satisfies a stronger condition. Give an example of a stronger condition that a withdrawal transaction might attempt to impose when it terminates and a schedule of two such transactions at SNAPSHOT isolation that causes them to behave incorrectly.
A searching algorithm that’s O(1)________.
a. requires one comparison b. does not necessarily require only one comparison c. can search only an array of one item. d. None of the above.
_____________________________________________ is an interpreted language useful for CGI applications.
Fill in the blank(s) with the appropriate word(s).
A customer wishes to network several computers throughout a large warehouse containing numerous metal shelves and concrete walls. The computers are at least 175 meters (574 feet) apart. Which of the following media types should be recommended for the customer using only a single switch?
A. Fiber optic B. Wireless C. CAT5e D. CAT3