Databricks : Databricks-Certified-Professional-Data-Engineer Korean Questions & Answers
Updated: Oct 14, 2026
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Reference: https://www.databricks.com/learn/certification/data-engineer-professional
Databricks Certified Professional Data Engineer Exam (Databricks-Certified-Professional-Data-Engineer Korean Version) Sample Questions:
데이터 과학 팀은 MLflow를 사용하여 프로덕션 모델을 생성하고 로그에 기록했습니다. 다음 코드는 프로덕션 모델을 올바르게 가져와 적용하여 "customer_id LONG, predictions DOUBLE, date DATE" 스키마를 가진 preds라는 새 DataFrame으로 예측 결과를 출력합니다.
데이터 과학 팀은 예측 결과를 Delta Lake 테이블에 저장하고, 시간 경과에 따른 모든 예측 결과를 비교할 수 있기를 원합니다. 고객 이탈 예측은 하루에 최대 한 번만 수행됩니다.
어떤 코드 블록이 잠재적인 컴퓨팅 비용을 최소화하면서 이 작업을 수행합니까?
- A.
- B.
- C. preds.write.mode( " append " ).saveAsTable( " churn_preds " )
- D.
- E. preds.write.format( " delta " ).save( " /preds/churn_preds " )
Correct Answer: C 🗳️
Databricks Auto Loader의 기본 실행 모드를 설명하는 문장은 무엇입니까?
- A. 새 파일은 입력 디렉터리 목록을 통해 식별되며, 새 파일은 대상 Delta Lake 테이블에 점진적으로 그리고 멱등적으로 로드됩니다.
- B. 클라우드 공급업체별 큐 스토리지 및 알림 서비스가 구성되어 새로 도착하는 파일을 추적합니다. 새 파일은 대상 Delta Lake 테이블에 점진적으로 그리고 비활성 상태로 저장됩니다.
- C. 웹훅 트리거를 통해 소스 디렉터리에 새 데이터가 도착할 때마다 Databricks 작업이 실행됩니다. 새 데이터는 데이터에서 추론된 규칙을 사용하여 대상 테이블에 자동으로 병합됩니다.
- D. 새 파일은 입력 디렉터리를 나열하여 식별하고, 대상 테이블은 소스 디렉터리의 모든 유효한 파일을 디렉터리 쿼리하여 구체화합니다.
Correct Answer: A 🗳️
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데이터 엔지니어링 팀은 컴퓨팅 리소스를 가장 많이 사용하는 사용자를 파악하고 리소스 활용 및 비용 관리를 개선하기 위해 Databricks 워크스페이스 내 사용량을 모니터링해야 했습니다. 이를 위해 팀은 Unity Catalog의 시스템 카탈로그에서 제공되는 Databricks 시스템 테이블을 사용하여 워크스페이스 활동에 대한 자세한 정보를 얻기로 결정했습니다.
이 목표를 달성하기 위해 팀은 시스템 카탈로그에서 어떤 SQL 쿼리를 실행해야 할까요?
- A. SELECT identity_metadata.run_as AS user_email,
사용량 합계를 총 DBUS로 계산
시스템.청구.사용에서
사용자 이메일별로 그룹화
총 DBS 값을 기준으로 내림차순 정렬
제한 수량 10개 - B. sku_name을 선택합니다,
identity_metadata.created_by AS user_email,
COUNT(usage_quantity) AS total_dbus
시스템.청구.사용에서
사용자 이메일과 제품 번호(sku)를 기준으로 그룹화합니다.
총 DBS 값을 기준으로 내림차순 정렬
제한 수량 10개 - C. sku_name을 선택합니다,
identity_metadata.created_by AS user_email,
SUM(usage_quantity * usage_unit) AS total_dbus
시스템.청구.사용에서
사용자 이메일과 제품 번호(sku)를 기준으로 그룹화합니다.
총 DBS 값을 기준으로 내림차순 정렬
제한 수량 10개 - D. sku_name을 선택합니다,
usage_metadata.run_name AS user_email,
사용량 합계를 총 DBUS로 계산
시스템.청구.사용에서
사용자 이메일과 제품 번호(sku)를 기준으로 그룹화합니다.
총 DBS 값을 기준으로 내림차순 정렬
제한 수량 10개
Correct Answer: A 🗳️
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유출은 다양한 대규모 변혁을 실행하는 과정에서 발생합니다. 하지만 유출을 진단하려면 핵심 지표를 사전에 적극적으로 찾아야 합니다.
Spark UI에서 파티션이 디스크로 스필링되고 있음을 나타내는 주요 지표 두 가지는 어디에 있습니까?
- A. 스테이지 상세 화면 및 쿼리 상세 화면
- B. 실행기 상세 화면 및 실행기 로그 파일
- C. 스테이지 상세 화면 및 실행자 파일
- D. 드라이버 및 실행기 로그 파일
Correct Answer: B 🗳️
다음 중 pyspark.sql.functions.broadcast의 올바른 사용법을 설명하는 문장은 무엇입니까?
- A. Databricks 워크스페이스 내의 모든 활성 클러스터에 대해 연결된 스토리지 볼륨에 지정된 테이블의 복사본을 캐시합니다.
- B. 모든 실행기의 메모리에 저장할 수 있을 만큼 열의 크기가 작다고 표시하여 브로드캐스트 조인을 허용합니다.
- C. 클러스터 수명 동안 모든 향후 쿼리에서 사용하기 위해 지정된 테이블의 복사본을 클러스터의 모든 노드에 캐시합니다.
- D. 이는 열의 카디널리티가 충분히 낮아 사용 가능한 파티션에 고유 값을 올바르게 매핑할 수 있음을 나타내어 브로드캐스트 조인을 허용합니다.
- E. 모든 실행기의 메모리에 저장할 수 있을 만큼 DataFrame의 크기가 작다고 표시하여 브로드캐스트 조인을 허용합니다.
Correct Answer: E 🗳️
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