INMT 342 FINAL EXAMINATION QUESTIONS WITH ALL CORRECT ANSWERS
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Course
INMT 342
Institution
INMT 342
INMT 342 FINAL EXAMINATION QUESTIONS WITH ALL CORRECT ANSWERS
What is the problem & solution for data integrity & transactions - Answer-Problem: Many users accessing data at once can interfere with each other
Solution: Concurrency Controls-managing users interfering
What are the 4 issues du...
INMT 342 FINAL EXAMINATION
QUESTIONS WITH ALL CORRECT
ANSWERS
What is the problem & solution for data integrity & transactions - Answer-Problem: Many
users accessing data at once can interfere with each other
What are the 4 issues due to concurrency - Answer-Lost Updates: Two or more
transactions attempt to update a record at same time, last update overwrites prior
update
Dirty reads: Transaction reads a record that has been changed, but the change has not
been committed to the database, reads old data
Inconsistent/non-repeatable reads: Transaction re-reads a record and retrieves different
data each time
Phantom reads: Transaction reads a record and upon re-read, the record has
disappeared
What is serializability in concurrency controls - Answer-Finish one transaction before
starting another
Locking Mechanisms: Data needed to update is locked to updater due to simultaneous
transactions
What are the levels & Types of locking mechanisms - Answer-Level:
Database
Table
Block/Page
Record
Field
Types:
Shared-Read but no write
Exclusive-No read or write
Update- combo of shared & exclusive
, What is big data? - Answer-extremely large data sets that may be analyzed
computationally to reveal patterns, trends, and associations, especially relating to
human behavior and interactions.
What are big dat characteristics - Answer-Volume - amount,
Velocity - speed at which new data arrives
Variety - differences in types/sources of data
Veracity - differences in data accuracy/quality
Variability - differences in flows of data
Complexity - dealing with simultaneous sources, types, speeds, timing
What is BASE in unstructured data - Answer-Basic Availability
Soft-state
Eventual consistency
What is CAP Theorem? - Answer-For a distributed computer system, Pick TWO
Consistency: when one user updates, all readers see it
Availability: allows continued operation
Partition Tolerance: able to work when there are two different users utilizing different
partitions.
What are some characteristics of NoSQL Databases - Answer--Do not use SQL as
primary language
-No fixed schema
-No join operations
-Scale horizontally
-Referred to as "Structured Storages"
What are the 5 data storage approaches - Answer-Relational: Store data in rows within
tables
Column Store: Store data in columns
Document Store: Store documents utilizing an index and simple queries
Key-Value: store values & an index to find them based on a key
Graph: Store model data as graphs with arcs representing relationships
How does Map Reduce work? - Answer-You input data, then group data, shuffle the
data around, Reduce into like kinds.
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