कम्प्युटर / सूचना प्रविधि कम्प्युटर अपरेटर (पाँचौँ तह) र सहायक – प्राविधिक पत्र
कम्प्युटर / सूचना प्रविधि – कम्प्युटर अपरेटर (पाँचौँ तह) र सहायक
Computer Operator & Assistant · Computer & IT Posts
५०२ 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 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)
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Which ACID property ensures that concurrently running transactions do not interfere with each other?
सही उत्तर: क) Isolation
Isolation makes concurrent execution behave like some serial execution.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which ACID property ensures that once a transaction commits, its changes survive a system crash?
सही उत्तर: ग) Durability
Durability guarantees that committed changes are permanent.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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With ON DELETE CASCADE on a foreign key, deleting a row in the parent table:
सही उत्तर: ग) Automatically deletes the matching rows in the child table
CASCADE carries the delete over to the dependent child rows.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which SQL constraint ensures that values in a column satisfy a given condition, such as age >= 18?
सही उत्तर: ख) CHECK
A CHECK constraint enforces a Boolean condition on column values.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A view in SQL is best described as a:
सही उत्तर: घ) Virtual table based on the result of a query
A view stores a query definition and presents its result as a table.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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