ITPEC IP April 2019 Question 26
ITPEC IP April 2019 — Question 26 of 100
A search of library information is normally read-only, so simultaneous searches do not change shared data and do not create conflicting updates. Transaction-consistency controls are essential when concurrent operations can modify the same value, consume the same resource, or depend on an ordering of updates.
Answer (c)
Why not others:
- simultaneous auction bids must be ordered consistently
- online orders can compete for limited stock
- train reservations can attempt to claim the same seat
Key rule: Concurrent reads can usually coexist, while concurrent writes or read-modify-write operations require transaction and locking controls.
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