What color is the Microphone input?
A. light blue
B. lime
C. black
D. orange
E. pink
Answer: E. pink
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Which of the following is true about a 2-3 tree?
a) A node may contain more than one element b) A node may have more than two children c) A 2-node has 0 or 3 children d) A 2-node has 0 or 3 children e) All of these statements are true
Calculate the cardinality and minimum cost for each of the following Selection operations:
Using the Hotel schema, assume the following indexes exist: ? a hash index with no overflow on the primary key attributes, roomNo/hotelNo in Room; ? a clustering index on the foreign key attribute hotelNo in Room; ? a B + -tree index on the price attribute in Room; ? a secondary index on the attribute type in Room. nTuples(Room) = 10000 bFactor(Room) = 200 nTuples(Hotel) = 50 bFactor(Hotel) = 40 nTuples(Booking) = 100000 bFactor(Booking) = 60 nDistinct hotelNo (Room) = 50 nDistinct type (Room) = 10 nDistinct price (Room) = 500 min price (Room) = 200 max price (Room) = 50 nLevels hotelNo (I) = 2 nLevels type (I) = 2 nLevels price (I) = 2 nLfBlocks price (I) = 50 S1: ? roomNo=1 ? hotelNo=1 (Room) S2: ? type=‘D’ (Room) S3: ? hotelNo=2 (Room) S4: ? price>100 (Room) S5: ? type=‘S’ ? hotelNo=3 (Room) S6: ? type=‘S’ ? price < 100 (Room)
The First Page Header can only be linked to the next five pages
Indicate whether the statement is true or false
Rather than returning a value, a method can signal its client by
a. Crashing the program b. Beeping c. Throwing an exception d. Ignoring the requested record