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Lakehouse interview questions

12 Lakehouse questions from the Big Data bank, written for Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd.

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1. What is Delta Lake?

Junior
  1. A.the bronze (raw) → silver (clean) → gold (curated) layering
  2. B.a warehouse stores structured modeled data; a lake stores raw multi-format data
  3. C.Parquet files plus a _delta_log transaction log giving ACID on object storage
  4. D.co-locating correlated column values across files to improve data skipping

Answer + AI explanation with Pro

2. Which term means: "Parquet files plus a _delta_log transaction log giving ACID on object storage"?

Junior
  1. A.data warehouse vs lake
  2. B.Delta Lake
  3. C.Z-ordering
  4. D.medallion architecture

Answer + AI explanation with Pro

3. Which statement is correct?

Junior
  1. A.Delta Lake — Parquet files plus a _delta_log transaction log giving ACID on object storage
  2. B.Delta Lake — co-locating correlated column values across files to improve data skipping
  3. C.Delta Lake — the bronze (raw) → silver (clean) → gold (curated) layering
  4. D.Delta Lake — a warehouse stores structured modeled data; a lake stores raw multi-format data

Answer + AI explanation with Pro

4. What is Z-ordering?

Mid
  1. A.co-locating correlated column values across files to improve data skipping
  2. B.a warehouse stores structured modeled data; a lake stores raw multi-format data
  3. C.Parquet files plus a _delta_log transaction log giving ACID on object storage
  4. D.the bronze (raw) → silver (clean) → gold (curated) layering

Answer + AI explanation with Pro

5. Which term means: "co-locating correlated column values across files to improve data skipping"?

Mid
  1. A.Delta Lake
  2. B.medallion architecture
  3. C.data warehouse vs lake
  4. D.Z-ordering

Answer + AI explanation with Pro

6. Which statement is correct?

Mid
  1. A.Z-ordering — a warehouse stores structured modeled data; a lake stores raw multi-format data
  2. B.Z-ordering — the bronze (raw) → silver (clean) → gold (curated) layering
  3. C.Z-ordering — co-locating correlated column values across files to improve data skipping
  4. D.Z-ordering — Parquet files plus a _delta_log transaction log giving ACID on object storage

Answer + AI explanation with Pro

7. What is medallion architecture?

Junior
  1. A.Parquet files plus a _delta_log transaction log giving ACID on object storage
  2. B.the bronze (raw) → silver (clean) → gold (curated) layering
  3. C.a warehouse stores structured modeled data; a lake stores raw multi-format data
  4. D.co-locating correlated column values across files to improve data skipping

Answer + AI explanation with Pro

8. Which term means: "the bronze (raw) → silver (clean) → gold (curated) layering"?

Junior
  1. A.Z-ordering
  2. B.Delta Lake
  3. C.data warehouse vs lake
  4. D.medallion architecture

Answer + AI explanation with Pro

9. Which statement is correct?

Junior
  1. A.medallion architecture — Parquet files plus a _delta_log transaction log giving ACID on object storage
  2. B.medallion architecture — a warehouse stores structured modeled data; a lake stores raw multi-format data
  3. C.medallion architecture — the bronze (raw) → silver (clean) → gold (curated) layering
  4. D.medallion architecture — co-locating correlated column values across files to improve data skipping

Answer + AI explanation with Pro

10. What is data warehouse vs lake?

Mid
  1. A.the bronze (raw) → silver (clean) → gold (curated) layering
  2. B.Parquet files plus a _delta_log transaction log giving ACID on object storage
  3. C.co-locating correlated column values across files to improve data skipping
  4. D.a warehouse stores structured modeled data; a lake stores raw multi-format data

Answer + AI explanation with Pro

11. Which term means: "a warehouse stores structured modeled data; a lake stores raw multi-format data"?

Mid
  1. A.Delta Lake
  2. B.Z-ordering
  3. C.data warehouse vs lake
  4. D.medallion architecture

Answer + AI explanation with Pro

12. Which statement is correct?

Mid
  1. A.data warehouse vs lake — co-locating correlated column values across files to improve data skipping
  2. B.data warehouse vs lake — a warehouse stores structured modeled data; a lake stores raw multi-format data
  3. C.data warehouse vs lake — Parquet files plus a _delta_log transaction log giving ACID on object storage
  4. D.data warehouse vs lake — the bronze (raw) → silver (clean) → gold (curated) layering

Answer + AI explanation with Pro

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