問題文
A telecommunications company must balance the ability to recover from mistakes against cloud storage cost for a large Delta table. Which two statements correctly describe the trade-off in the VACUUM retention threshold? (Select two.)
選択肢
- Setting a higher threshold gives access to a greater history for the table but increases the number of data files stored and therefore storage cost.
- The ability to query table versions older than the retention period is preserved, because the transaction log is retained for 30 days.
- The threshold has no effect on storage cost, because VACUUM only removes metadata.
- Lowering the threshold below 7 days is safe as long as the retention duration check is left enabled, because the check blocks unsafe values.
- Databricks strongly recommends a retention interval of at least 7 days, because a short period could delete files written by long-running jobs before they commit.