कम्प्युटर / सूचना प्रविधि कम्प्युटर अधिकृत (सातौँ तह) – प्राविधिक पत्र
कम्प्युटर / सूचना प्रविधि – कम्प्युटर अधिकृत (सातौँ तह)
Computer Officer – 7th Level · Computer & IT Posts
२,५७७ प्रश्न उपलब्ध। मोड छान्नुहोस्:
प्राविधिक पत्र: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ५ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / 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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Which pair of lock modes is compatible, so that two transactions can hold them on the same data item at the same time?
सही उत्तर: क) Shared - Shared
Many transactions may read together, but an exclusive lock conflicts with every other lock.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In two-phase locking (2PL), the phase in which a transaction may acquire locks but cannot release any lock is the:
सही उत्तर: ख) Growing phase
During the growing phase, locks are only obtained and never released.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A dirty read occurs when a transaction:
सही उत्तर: घ) Reads data written by another transaction that has not yet committed
A dirty read is reading uncommitted changes of another transaction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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