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C192 Transaction Management

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C192 Practice Test
Craig Willey
Quiz por Craig Willey, atualizado more than 1 year ago
Craig Willey
Criado por Craig Willey mais de 4 anos atrás
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Resumo de Recurso

Questão 1

Questão
All transaction properties must display ____
Responda
  • atomicity, serializability, and durability
  • durability and isolation
  • serializability, durability, and isolation
  • atomicity, durability, serializability, and isolation

Questão 2

Questão
A ____ lock prevents the use of any tables in the database from one transaction while another transaction is being processed
Responda
  • database-level
  • table-level
  • page-level
  • row-level

Questão 3

Questão
A ____ lock locks the entire table preventing access to any row by a transaction while another transaction is using the table.
Responda
  • database-level
  • table-level
  • page-level
  • row-level

Questão 4

Questão
A ____ lock locks the entire diskpage.
Responda
  • transaction-level
  • table-level
  • page-level
  • row-level

Questão 5

Questão
A ____ lock allows concurrent transactions to access different rows of the same table.
Responda
  • database-level
  • table-level
  • page-level
  • row-level

Questão 6

Questão
A(n) ____ lock has only two stages (0 & 1).
Responda
  • shared
  • exclusive
  • binary
  • two-phase

Questão 7

Questão
A(n) ____ specifically reserves access to the transaction that locked the object.
Responda
  • shared lock
  • exclusive lock
  • binary lock
  • deadlock

Questão 8

Questão
A(n) ____ lock exists when concurrent transactions are granted read access on the basis of a common lock.
Responda
  • shared
  • exclusive
  • binary
  • two-phase

Questão 9

Questão
A(n) ____ lock defines how transactions acquire and relinquish locks.
Responda
  • shared
  • exclusive
  • binary
  • two-phase

Questão 10

Questão
A(n) ____ condition occurs when two transactions wait for each other to unlock data.
Responda
  • deadlock
  • exclusive lock
  • binary lock
  • two-phase lock

Questão 11

Questão
Which of the following rules applies to the two-phase locking protocol?
Responda
  • Two transactions cannot have conflicting locks.
  • No unlock operation can precede a lock operation in a different transaction.
  • No data is affected until all locks are released.
  • No data is affected until the transaction is in its locked position.

Questão 12

Questão
____ control is the management of concurrent transaction execution.
Responda
  • Concurrency
  • Lock
  • Transaction
  • Database

Questão 13

Questão
The most common algorithms for concurrency control are locks, ____ stamping, and optimistic methods.
Responda
  • date
  • time
  • hour
  • minute

Questão 14

Questão
____ requires that all operations of a transaction be completed.
Responda
  • Specificity
  • Atomicity
  • Durability
  • Time stamping

Questão 15

Questão
____ means that data used during the execution of a transaction cannot be used by a second transaction until the first one is completed.
Responda
  • Serializability
  • Atomicity
  • Isolation
  • Time stamping

Questão 16

Questão
When you read from and/or write to a database, you have created a(n) ____.
Responda
  • transaction
  • back up
  • update
  • queue

Questão 17

Questão
A transaction is a ____ unit of work that must be either entirely completed or aborted.
Responda
  • timed
  • practical
  • logical
  • physical

Questão 18

Questão
The ANSI has defined standards that govern SQL database transactions. Transaction support is provided by two SQL statements: ____ and ROLLBACK.
Responda
  • RETRIEVE
  • ASSIGN
  • UPDATE
  • COMMIT

Questão 19

Questão
The ____ establishes the order in which the operations within concurrent transactions are executed.
Responda
  • transaction log
  • timer
  • lock manager
  • scheduler

Questão 20

Questão
The ____ manager is responsible for assigning and policing the locks used by the transactions.
Responda
  • transaction
  • database
  • lock
  • schedule

Questão 21

Questão
Lock ____ indicates the level of lock use.
Responda
  • granularity
  • shrinking
  • growing
  • serializability

Questão 22

Questão
During the ____ phase, the transaction scans the database, executes the needed computations, and makes the updates to a private copy of the database values.
Responda
  • read
  • validation
  • write
  • shared

Questão 23

Questão
During the ____ phase, the changes are permanently applied to the database.
Responda
  • read
  • validation
  • write
  • shared

Questão 24

Questão
During the ____ phase, the changes are permanently applied to the database.
Responda
  • read
  • validation
  • write
  • shared

Questão 25

Questão
A(n) ____ backup of the data is when only the last modifications done to the database are copied.
Responda
  • differential
  • complete
  • partial
  • incomplete

Questão 26

Questão
A transaction that changes the contents of the database must alter the database from one ____ state to another.
Responda
  • consistent
  • dependent
  • independent
  • inconsistent

Questão 27

Questão
When is the implicit beginning of a transaction?
Responda
  • When the database is started
  • When a table is accessed for the first time
  • When the first SQL statement is encountered
  • When the COMMIT command is issued

Questão 28

Questão
A(n) ____ phase in a two-phase lock is when a transaction releases all locks and cannot obtain any new lock.
Responda
  • growing
  • shrinking
  • locking
  • unlocking

Questão 29

Questão
The ____ approach is based on the assumption that the majority of the database operations do not conflict.
Responda
  • default
  • basic
  • scheduled
  • optimistic

Questão 30

Questão
A diskpage, or page, is the equivalent of a ____.
Responda
  • database table
  • disk sector
  • database schema
  • diskblock

Questão 31

Questão
The ____ is responsible for assigning and policing the locks used by the transactions.
Responda
  • lock manager
  • scheduler
  • DBA
  • transaction log

Questão 32

Questão
What is a consistent database?
Responda
  • One in which all tables have foreign keys
  • One in which all data integrity constraints are satisfied
  • One in which all tables are normalized
  • One in which all SQL statements only update one table at a time

Questão 33

Questão
A transaction acquires a ____ prior to data access.
Responda
  • grain
  • timestamp
  • lock
  • key

Questão 34

Questão
Changes are permanently applied to the database during the ____ phase of a transaction.
Responda
  • commit
  • write
  • input
  • output

Questão 35

Questão
The ____ approach to scheduling concurrent transactions assigns a global unique stamp to each transaction.
Responda
  • scheduled
  • table-locking
  • unique
  • time-stamping

Questão 36

Questão
All transactions are controlled and executed by the ____ to guarantee database integrity.
Responda
  • scheduler
  • DBMS
  • transaction log
  • DBA

Questão 37

Questão
You can define ____ to help the DBMS ensure that the database remains in a consistent state.
Responda
  • integrity constraints
  • business rules
  • lock-level transactions
  • stored procedures

Questão 38

Questão
By its nature, a single-user database system automatically ensures ____ of the database, because only one transaction is executed at a time.
Responda
  • serializability and durability
  • atomicity and isolation
  • serializability and isolation
  • atomicity and serializability

Questão 39

Questão
The information stored in the ____ is used by the DBMS for a recovery requirement triggered by a ROLLBACK statement, a program’s abnormal termination, or a system failure such as a network discrepancy or a disk crash.
Responda
  • data dictionary
  • metadata
  • rollback manager
  • transaction log

Questão 40

Questão
Which of the following is NOT stored in the transaction log?
Responda
  • The type of operation performed
  • A record for the beginning of a transaction
  • The name of the table
  • The number of affected records

Questão 41

Questão
What is one of the three most common data integrity and consistency problems?
Responda
  • Lost updates
  • Disk failures
  • User errors
  • Deadlocks

Questão 42

Questão
The phenomenon of ____ occurs when two transactions, T1 and T2, are executed concurrently and the first transaction (T1) is rolled back after the second transaction (T2) has already accessed the uncommitted data—thus violating the isolation property of transactions.
Responda
  • lost updates
  • uncommitted data
  • transaction failure
  • inconsistent retrieval

Questão 43

Questão
____ occur when a transaction calculates some summary (aggregate) functions over a set of data while other transactions are updating the data.
Responda
  • Lost updates
  • Uncommitted data
  • Transaction failures
  • Inconsistent retrievals

Questão 44

Questão
As long as two transactions, T1 and T2, access ____ data, there is no conflict, and the order of execution is irrelevant to the final outcome.
Responda
  • shared
  • common
  • unrelated
  • locked

Questão 45

Questão
The scheduler facilitates data ____ to ensure that two transactions do not update the same data element at the same time.
Responda
  • durability
  • isolation
  • atomicity
  • serializability

Questão 46

Questão
What is the most restrictive lock granularity?
Responda
  • Database
  • Table
  • Page
  • Row

Questão 47

Questão
Which lock granularity has the highest overhead?
Responda
  • Database
  • Table
  • Row
  • Field

Questão 48

Questão
A ____ lock has only two states.
Responda
  • shared
  • binary
  • database
  • row-level

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