Transaction - answer-A logical unit of work that must be entirely completed or aborted
Atomicity - answer-All operations of a transaction must be completed; if not the transaction is aborted
Consistency - answer-Permanence of database's consistent state
Isolation - answer-Data used during ...
UTA INSY 3304 - Chapter 10 exam
Transaction - answer-✔A logical unit of work that must be entirely completed or
aborted
Atomicity - answer-✔All operations of a transaction must be completed; if not the
transaction is aborted
Consistency - answer-✔Permanence of database's consistent state
Isolation - answer-✔Data used during transaction cannot be used by second
transaction until the first is completed
Durability - answer-✔Ensures that once transactions are committed they cannot be
undone or lost
Serializability - answer-✔Ensures that the schedule for the concurrent execution of
several transactions should yield consistent results
Transaction Log - answer-✔Keeps track of all transactions that update the database
DBMS uses the information stored in a log for (a):
- Recovery requirement triggered by a ROLLBACK statement
- Program's abnormal termination
- System failure
INSY 3304 MIDTERM EXAM QUIZZES AND ANSWERS
, INSY 3304 MIDTERM EXAM QUIZZES AND ANSWERS
Concurrency Control - answer-✔Coordination of the simultaneous transactions
execution in a multiuser database system
• Objective: ensures serializability of transactions in a multiuser database
environment
Problems in Concurrency Control - answer-✔Lost update, uncommitted data,
inconsistent retrievals
Scheduler - answer-✔Establishes the order in which the operations are executed
within concurrent transactions
- Creates serialization schedule
Locking methods - answer-✔facilitate isolation of data items used in concurrently
executing transactions
Lock - answer-✔guarantees exclusive use of a data item to a current transaction
Pessimistic locking - answer-✔use of locks based on the assumption that conflict
between transactions is likely
Lock manager - answer-✔responsible for assigning and policing the locks used by
the transactions
Lock Granularity - answer-✔- indicates level of lock use
- levels: database, table, page, row, or field (attribute)
INSY 3304 MIDTERM EXAM QUIZZES AND ANSWERS
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