Match the following terms to their meanings:
I. criterion
II. filter
III. normalization
IV. comparison operator
V. foreign key
A. process of grouping data into correct tables
B. display of a subset of records
C. evaluates the relationship between two quantities
D. number, text phrase, or expression used to select records from a table
E. a field in one table that is the primary key in another table
D, B, A, C, E
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Answer the following questions true (T) or false (F)
1. True/False: To Read the contents of a sequential file, you must first Open the file for Input. 2. True/False: Control-break processing uses a control variable to exit a loop or a module when a specific condition is met. 3. True/False: The attributes of an object are the operations that may be applied to it.
Which of the following statements is false?
a. If an operation requires the executing thread to hold a lock while the operation is performed, a thread must relase the lock before proceeding with the operation. Other threads attempting to perform an operation that requires the same lock will be blocked until the first thread releases the lock, at which point the blocked threads may attempt to acquire the lock and proceed with the operation. b. To specify that a thread must hold a monitor lock to execute a block of code, the code should be placed in a synchronized statement. c. Code in a synchronized statement is said to be guarded by the monitor lock; a thread must acquire the lock to execute the guarded statements. d. The monitor allows only one thread at a time to execute statements within synchronized statements that lock on the same object, as only one thread at a time can hold the monitor lock. The synchronized statements are declared using the synchronized keyword.
Which computer upgrade would most likely result in a power supply upgrade?
A) Installing dual monitors B) Maximizing the refresh rate C) Increasing the resolution D) Installing a video card
When merging ____, we merge the corresponding merge runs from each file into a merge run in the output file.
A. files that are not completely ordered B. random access files C. sequential files D. binary files