Quiz
Which of the following statements is true?
- In wound-wait deadlock handling, if T is older than U and needs a lock held by U, then T is allowed to wait. On the other hand, if U is older than T, then T is rolled back.
- A saga typically involves several transactions, each of which has a well-defined inverse.
- We showed that it is impossible for a Map Reduce job to do certain group by aggregations involving sums and counts.