डाटाबेस र DBMS – Database & DBMS MCQ
डाटाबेस र DBMS – कम्प्युटर र IT
Database & DBMS · Computer & IT (Technical) · ५६३ प्रश्न
५६३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
डाटाबेस र DBMS: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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A major problem of traditional file processing systems that a DBMS helps to reduce is:
सही उत्तर: घ) Data redundancy and inconsistency
Separate files often duplicate data, causing redundancy and inconsistency.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Data about data, such as table definitions stored in the data dictionary, is called:
सही उत्तर: घ) Metadata
Metadata describes the structure and properties of the data.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Physical data independence means the ability to change the:
सही उत्तर: ग) Internal schema without changing the conceptual schema
Changes to physical storage should not affect the logical (conceptual) schema.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the ANSI/SPARC three-schema architecture, which level describes how data is physically stored?
सही उत्तर: ग) Internal level
The internal (physical) level describes storage structures.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The main purpose of a checkpoint in database recovery is to:
सही उत्तर: ख) Reduce the amount of log that must be scanned during recovery
After a checkpoint, recovery only needs to examine the log from that point.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Under the Write-Ahead Logging (WAL) rule:
सही उत्तर: क) Log records must be written to stable storage before the related data is written to the database
WAL ensures the log can be used to undo or redo changes after a failure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which SQL isolation level prevents dirty reads, non-repeatable reads and phantom reads?
सही उत्तर: ख) SERIALIZABLE
SERIALIZABLE is the strictest standard isolation level and prevents all three.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A schedule is conflict serializable if and only if its precedence graph is:
सही उत्तर: क) Acyclic
A precedence graph without cycles means an equivalent serial order exists.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a DBMS, a deadlock is detected when the wait-for graph:
सही उत्तर: क) Contains a cycle
A cycle in the wait-for graph means transactions are waiting on each other.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The wait-die and wound-wait schemes are used for:
सही उत्तर: घ) Deadlock prevention
Both are timestamp-based schemes that prevent deadlock.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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