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Managing Multiuser Databases Questions

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Choose the correct option.

Locks placed by command are called ________ .


Aimplicit locks

Bexplicit locks

Cexclusive locks

Dshared locks

Answer: Option B

Explanation:

Here is no explanation for this answer

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Which of the following allows dirty reads, nonrepeatable reads and phantom reads to occur?


ARead committed

BRead uncommitted

CRepeatable read

DSerializable

Answer: Option B

Explanation:

Here is no explanation for this answer

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Locks placed by the DBMS are called ________ .


Aimplicit locks

Bexplicit locks

Cexclusive locks

Dshared locks

Answer: Option A

Explanation:

Here is no explanation for this answer

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Choose the correct option.

The default extension for an Oracle SQL*Plus file is:


A.txt.

B.pls.

C.ora.

D.sql.

Answer: Option D

Explanation:

Here is no explanation for this answer

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Choose the correct option.

An Oracle System Change Number (SCN):


Ais a value that is incremented whenever a dirty read occurs.

Bis incremented whenever a deadlock occurs.

Cis a value that keeps track of explicit locks.

Dis a value that is incremented whenever database changes are made.

Answer: Option D

Explanation:

Here is no explanation for this answer

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The size of a lock is called:


Aimplicit lock.

Block granularity.

Cexclusive lock.

Dshared lock.

Answer: Option B

Explanation:

Here is no explanation for this answer

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The left-leaning slash tells Oracle to execute whatever statement is in the buffer.


ATRUE

BFALSE

Answer: Option B

Explanation:

Here is no explanation for this answer

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When you type Start FILENAME, the statement in your file will be executed automatically.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

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Choose the correct option.

Sequences guarantee valid surrogate key values.


ATRUE

BFALSE

Answer: Option B

Explanation:

Here is no explanation for this answer

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Indexes are created to enforce uniqueness on columns and to enable fast retrieval by column values.


ATRUE

BFALSE

Answer: Option A

Explanation:

Here is no explanation for this answer

Workspace

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