Describe the two-phase commit protocol when one or more of the database managers is using an optimistic concurrency control.
What will be an ideal response?
The validation procedure is performed after the prepare message has been received. If validation is successful the cohort votes ready, otherwise it votes aborting.
Computer Science & Information Technology
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Which mistake was not made by AECL, the manufacturer of the Therac-25?
a. It did not include software or hardware devices to detect and report overdoses. b. It did not tell other hospitals about possible overdose incidents. c. It reused code without proper testing. d. It continued to sell the Therac-25 after the FDA declared it to be defective. e. AECL made all of these mistakes, and more.
Computer Science & Information Technology
A variable that is visible to every form in a program is said to have scope.
(A) class (B) module (C) global (D) namespace
Computer Science & Information Technology