フリー問題

問題文

A wide table is queried for a few columns out of two hundred. Which storage choice reduces the bytes read?

選択肢

1. The columnar arrangement lets the scan fetch picked columns from each file, and the row-oriented text layout forces the scan to read whole lines during every pass.
2. The columnar arrangement lets the scan fetch complete stripes from each file, and the row-oriented text layout forces the scan to read whole lines during every pass.
3. The columnar arrangement lets the scan fetch picked columns from each file, and the row-oriented text layout forces the scan to read grouped keys during every pass.
4. The columnar arrangement lets the scan fetch complete stripes from each file, and the row-oriented text layout forces the scan to read grouped keys during every pass.