Database Management Systems Mcqs

Page No. 64

Evaluate the CREATE TABLE statement:
CREATE TABLE products (product_id NUMBER(6) CONSTRAINT prod_id_pk PRIMARY KEY, product_name VARCHAR2(15));
Which statement is true regarding the PROD_ID_PK constraint?


aIt would be created only if a unique index is manually created first

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bIt would be created and would use an automatically created unique index

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cIt would be created and would use an automatically created no unique index

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dIt would be created and remains in a disabled state because no index is specified in the command

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An application developer can guard against certain snapshot anomalies by appending a ______ clause to the SQL select query.


aFor update

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bFor read

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cFor write

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dNone of the mentioned

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View Answer For update

Each of a pair of transactions has read data that is written by the other, but there is no data written by both transactions, is referred to as


aRead skew

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bUpdate skew

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cWrite lock

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dNone of the mentioned

✓


View Answer None of the mentioned

When a transaction Ti attempts to update a data item, it requests a _________ on that data item.


aRead lock

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bUpdate lock

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cWrite lock

✓


dChain lock

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View Answer Write lock

Under first updater wins the system uses a __________ mechanism that applies only to updates.


aClose

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bRead

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cLocking

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dBeat

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View Answer Locking

Lost update problem is


aSecond update overwrites the first

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bFirst update overwrites the second

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cThe updates are lost due to conflicting problem

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dNone of the mentioned

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Snapshot isolation is used to give


aTransaction a snapshot of the database

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bDatabase a snapshot of the transaction

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cDatabase a snapshot of committed values in the transaction

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dTransaction a snapshot of the database and Database a snapshot of committed values in the transaction

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Snapshot isolation is a particular type of ______________ scheme.


aConcurrency-control

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bConcurrency-allowance

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cRedirection

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dRepetition-allowance

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View Answer Concurrency-control

DBMS periodically suspends all processing and synchronizes its files and journals through the use of


aCheckpoint facility

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bBackup facility

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cRecovery manager

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dDatabase change log

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View Answer Checkpoint facility

The extent of the database resource that is included with each lock is called the level of


aImpact

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bGranularity

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cManagement

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dDBMS control

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View Answer Granularity

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