shared lock is requested using the ___________ instruction.a)lock-sharedb)lock-Xc)lock-Sd)lock-Pe)exclusive(x)
Question
shared lock is requested using the ___________ instruction.
a) lock-shared
b) lock-X
c) lock-S
d) lock-P
e) exclusive(x)
Solution
1. Break Down the Problem
We need to identify the correct instruction to request a shared lock from the provided options.
2. Relevant Concepts
In database and computer science contexts, locking mechanisms are used to control access to data. A shared lock allows multiple transactions to read the same data while preventing any from modifying it.
3. Analysis and Detail
- Option a) lock-shared: This suggests a specific instruction for acquiring a shared lock.
- Option b) lock-X: Typically refers to an exclusive lock, which prevents any other transactions from accessing the locked resource.
- Option c) lock-S: This could be another notation for a shared lock, as 'S' usually denotes shared in locking terminology.
- Option d) lock-P: This doesn't correspond to standard instruction naming for shared locks.
- Option e) exclusive(x): Clearly indicates an exclusive lock.
4. Verify and Summarize
The best option that aligns with requesting a shared lock is "lock-shared" or "lock-S." However, based on common terminology, "lock-S" is likely to be the intended answer.
Final Answer
The shared lock is requested using the lock-S instruction.
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