Practice Library
All MCQs
Browse exam-wise, subject-wise, and country-wise MCQs with explanations.
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Correct Answer: D. records are placed wherever space is available, without ordering by a key
Explanation:
This statement is correct because heap file organization means that records are placed wherever space is available, without ordering by a key.
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Correct Answer: D. an index that has an entry for every search key value or record
Explanation:
The correct answer explains dense index in the context of File Organization.
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Correct Answer: D. a transaction is treated as all-or-nothing
Explanation:
atomicity is used in Advanced DBMS because a transaction is treated as all-or-nothing.
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Correct Answer: B. an interleaved schedule produces the same effect as some serial schedule
Explanation:
This statement is correct because serializable schedule means that an interleaved schedule produces the same effect as some serial schedule.
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Correct Answer: C. records are stored in a sorted sequence according to a search key
Explanation:
The correct answer explains sequential file organization in the context of File Organization.
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Correct Answer: B. an index that has an entry for every search key value or record
Explanation:
dense index is used in Advanced DBMS because an index that has an entry for every search key value or record.
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Correct Answer: B. a transaction is treated as all-or-nothing
Explanation:
This statement is correct because atomicity means that a transaction is treated as all-or-nothing.
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Correct Answer: D. a schedule can be transformed to a serial schedule by swapping non-conflicting operations
Explanation:
The correct answer explains conflict serializability in the context of Transactions.
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Correct Answer: C. records are stored in a sorted sequence according to a search key
Explanation:
sequential file organization is used in Advanced DBMS because records are stored in a sorted sequence according to a search key.
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Correct Answer: B. an index that has an entry for every search key value or record
Explanation:
This statement is correct because dense index means that an index that has an entry for every search key value or record.
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Correct Answer: D. a transaction moves the database from one valid state to another valid state
Explanation:
The correct answer explains consistency in the context of Transactions.
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Correct Answer: D. a schedule can be transformed to a serial schedule by swapping non-conflicting operations
Explanation:
conflict serializability is used in Advanced DBMS because a schedule can be transformed to a serial schedule by swapping non-conflicting operations.
