GATE CS 2022 Set 1 — Question 39
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Databases → Transactions & Concurrency → Conflict Serializability
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Question
Let and denote read and write operations on a data element by a transaction , respectively. Consider the schedule with four transactions. Which one of the following serial schedules is conflict equivalent to ?
Correct answer
(A) T₁ arrow T₃ arrow T₄ arrow T₂
Solution
To find the conflict equivalent serial schedule, we identify all conflicting operations (different transactions, same data item, at least one is a write) and determine the required order:
From the edges, we see that must be first, followed by , then , and finally .
The only valid serial order is .
1.Conflicts on :
- is before
- is before
- is before (No conflict as it's the same transaction)
- is before
- is before
- is before
- is before
From the edges, we see that must be first, followed by , then , and finally .
The only valid serial order is .
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