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Reference: https://www.databricks.com/learn/certification/data-engineer-associate
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Databricks Certified Data Engineer Associate Exam (Databricks-Certified-Data-Engineer-Associate日本語版) Sample Questions:
データエンジニアが、コスト最適化されたイベント駆動型パイプラインを設計しています。S3バケットを監視するために、ファイル到着トリガーを設定したLakeflowジョブを構成します。このジョブは、トリガー(availableNow=True)を使用してAuto LoaderでデータをBronzeテーブルに取り込むノートブックを実行します。この統合パターンにおけるファイル到着トリガーとAuto Loaderの技術的な関係は何ですか？
- A. ファイル到着トリガーを使用する場合、エンジニアはオートローダーのチェックポイントを無効にして、ジョブが同じファイルを複数回処理するのを防ぐ必要があります。
- B. ファイル到着トリガーはジョブの実行を開始し、オートローダーは内部チェックポイントを使用して、前回の正常なコミット以降に到着した新しいファイルのみを独自に識別して処理します。
- C. Lakeflowジョブファイル到着トリガーと連携するには、Auto Loaderをファイル通知モードに設定する必要があります。
- D. ファイル到着トリガーは、新しく到着した特定のファイルパスを自動的にオートローダーに渡すため、エンジニアはコード内のソースパス構成を省略できます。
Correct Answer: B 🗳️
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データエンジニアは、メモリ使用量を削減しパフォーマンスを向上させるために、Deltaテーブルから一部の列のみを読み込みたいと考えています。どのSpark DataFrame操作を使用すべきでしょうか？
- A. groupBy
- B. orderBy
- C. 選択
- D. フィルター
Correct Answer: C 🗳️
データエンジニアが、地域別に売上データをグループ化し、各地域の総収益を計算するSparkコードを作成しています。グループ化操作を実行するSpark DataFrame変換はどれですか？
- A. groupBy
- B. orderBy
- C. 選択
- D. フィルター
Correct Answer: A 🗳️
データエンジニアは、データセットが大きすぎてメモリに収まらないため、DataFrameをメモリではなくディスクに永続化する必要があります。Sparkのどの永続化レベルがディスクストレージをサポートしていますか？
- A. メモリ専用
- B. メモリシリアライズ
- C. メモリとディスク
- D. メモリ専用サービス
Correct Answer: C 🗳️
「DESCRIBE HISTORY students」コマンドを使用して、「students」テーブルのデルタトランザクションログが表示されます。データエンジニアは、ログに記載されている UPDATE 操作が行われる前の状態のテーブルを照会する必要があります。データエンジニアは、この目的を達成するためにどのコマンドを使用すべきでしょうか？
(2つ選択してください。)
- A. 3 時点の歴史バージョンの生徒から * を選択
- B. SELECT * FROM students TIMESTAMP AS OF '2024-04-22T14:32:58.000+00:00'
- C. SELECT * FROM students TIMESTAMP AS OF '2024-04-22T14:32:47.000+00:00'
- D. SELECT * FROM students@v4
- E. SELECT * FROM students VERSION AS OF 5
Correct Answer: C,D 🗳️
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