CSE 511 Week 4 Exam Questions With
Verified And Updated Answers
What is a sharded deployment of a database? - answer✔Each fragment resides in one site only
What is the main disadvantage of full replication? - answer✔The process to perform a single
update is slower since it must be updated on different databases to keep the copies consistent.
What Rule of Thumb do we use to consider Replication? - answer✔If read-only queries / update
queries >> 1
How does one create a horizontal fragmentation of a database table? - answer✔By placing
table records into multiple smaller tables.
Which table key should be copied to each of the subtables created in a vertical fragmentation? -
answer✔Primary key of a table should be copied to each and every subtable created in a
vertical fragmentation.
Which of the following areas is negatively affected when data is replicated across multiple
sites? - answer✔Data updates
What is the main objective of distributed query processing? - answer✔Form a high level query
on a distributed database for optimal execution.
What does a query execution plan impact? - answer✔Query performance
What cannot be a goal in a query processing? - answer✔The solution space for a query is a fixed
set of equivalent algebraic expressions; it cannot be maximized.
What is the correct order of tasks in a typical distributed query processing? -
answer✔Decomposition, Optimization, Localization
Which of the following search algorithms takes the longest processing time? -
answer✔Exhaustive Search
What is the correct order of tasks in a typical distributed query processing? -
answer✔Decomposition, Localization, Optimization
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