How VACCUM and OPTIMIZE commands can be used to manage the DELTA lake?

How VACCUM and OPTIMIZE commands can be used to manage the DELTA lake?
A . VACCUM command can be used to compact small parquet files, and the OP-TIMZE command can be used to delete parquet files that are marked for dele-tion/unused.
B . VACCUM command can be used to delete empty/blank parquet files in a delta table.
OPTIMIZE command can be used to update stale statistics on a delta table.
C . VACCUM command can be used to compress the parquet files to reduce the size of the table, OPTIMIZE command can be used to cache frequently delta tables for better performance.
D . VACCUM command can be used to delete empty/blank parquet files in a delta table, OPTIMIZE command can be used to cache frequently delta tables for better performance.
E . OPTIMIZE command can be used to compact small parquet files, and the VAC-CUM command can be used to delete parquet files that are marked for deletion/unused. (Correct)

View Answer

Answer: E

Explanation:

VACCUM:

You can remove files no longer referenced by a Delta table and are older than the retention thresh-old by running the vacuum command on the table. vacuum is not triggered automatically. The de-fault retention threshold for the files is 7 days. To change this behavior, see Configure data retention for time travel.

OPTIMIZE:

Using OPTIMIZE you can compact data files on Delta Lake, this can improve the speed of read queries on the table. Too many small files can significantly degrade the performance of the query.