問題文
A ticketing application updates one counter row so often that the transactions queue behind each other. Which feature removes that queue while keeping the count correct?
選択肢
- A column is declared as reservable and the database then keeps the committed value visible so the readers never wait.
- A column is declared as reservable and the database later defers every update to the end of the batch window so the counter changes once per window.
- A column is declared as reservable and the database then stores the counter inside the memory area for results so the row is never touched.
- A column is declared as reservable and the database then records the amount each transaction takes rather than blocking on the row itself.