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Exam MB-500 topic 7 question 9 discussion

Actual exam question from Microsoft's MB-500
Question #: 9
Topic #: 7
[All MB-500 Questions]

You are Dynamics 365 Finance developer.
You need to explain the performance advantages of the different concurrency models.
What are three performance advantages of optimistic concurrency control over pessimistic concurrency control? Each correct answer presents a complete solution.
NOTE: Each correct selection is worth one point.

  • A. Records are locked as soon as they are retrieved from the database.
  • B. Records remain available for other processes while they are selected from the database.
  • C. Records are locked for a shorter length of time.
  • D. Fewer resources are used to lock records during updates.
  • E. One record cannot be selected for update by two different processes at the same time.
Show Suggested Answer Hide Answer
Suggested Answer: BCD 🗳️
Optimistic Concurrency only locks records from the time when the actual update is performed.
Following are the advantages of using OCC:
Records remain available for other processes to update if they have been selected from the database but haven't yet been updated.
Records are locked for a shorter length of time.
Fewer resources are used to hold the locks during the update process.
Incorrect Answers:
A: Pessimistic Concurrency Control locks records as soon as they are fetched from the database for an update.
E: One record can be selected for update by two different processes at the same time when using OCC.
Reference:
https://docs.microsoft.com/en-us/dynamicsax-2012/developer/optimistic-concurrency-control
by OzDiMe at Sept. 21, 2021, 12:22 a.m.

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OzDiMe
Highly Voted 3 years, 8 months ago
Correct. https://docs.microsoft.com/en-us/dynamicsax-2012/developer/optimistic-concurrency-control
upvoted 8 times
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TrevStyleZ
Most Recent 11 months, 2 weeks ago
Correct OCC advantages: Fewer resources are used to lock records during updates. Records are locked for a shorter length of time by using OCC instead of PCC. Records remain available for other processes while they are selected from the database.
upvoted 2 times
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Prollyx
3 years, 2 months ago
Selected Answer: BCD
Correct
upvoted 2 times
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