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Databricks Certified Data Engineer Professional Exam (Databricks-Certified-Data-Engineer-Professional日本語版) Sample Questions:

1. データ取り込みタスクでは、1TBのJSONデータセットを、ターゲット部分ファイルサイズ512MBでParquetに書き出す必要があります。Delta LakeではなくParquetを使用しているため、自動最適化や自動圧縮などの組み込みファイルサイズ調整機能は使用できません。
データをシャッフルせずに最高のパフォーマンスを実現する戦略はどれですか?

A) spark.sql.shuffle.partitions を 2,048 パーティション (1TB*1024*1024/512) に設定し、データを取り込み、ナロー変換を実行し、データをソートして最適化し (これにより、データが自動的に再パーティション化されます)、parquet に書き込みます。
B) データを取り込み、ナロー変換を実行し、2,048 個のパーティション (1TB*) に再分割します。
1024*1024/512)を計算し、parquet に書き込みます。
C) spark.sql.adaptive.advisoryPartitionSizeInBytes を 512 MB バイトに設定し、データを取り込み、ナロー変換を実行し、2,048 個のパーティション (1TB*1024*1024/512) に結合してから、parquet に書き込みます。
D) spark.sql.files.maxPartitionBytes を 512 MB に設定し、データを取り込み、ナロー変換を実行してから、parquet に書き込みます。
E) spark.sql.shuffle.partitions を 512 に設定し、データを取り込み、ナロー変換を実行してから、parquet に書き込みます。


2. ユーザーは、DLT 期待値を使用して、派生テーブル レポートに、テーブル validation_copy に含まれるソースからのすべてのレコードが含まれていることを検証したいと考えています。
ユーザーは、レポート テーブル定義に期待値を追加することでこれを達成しようとしますが、失敗します。

どのアプローチを使用すれば、DLT 期待値を使用して、このテーブルに存在するすべての期待レコードを検証できますか?

A) 検証コピーとレポートに対して左外部結合を実行する一時テーブルを定義し、レポートキー値がnullにならないという期待値を定義します。
B) validation_copyとreportとreportの左外部結合を実行し、その結果をreportテーブルのDLT期待値と比較する関数を定義します。
C) 2 つのテーブルで左外部結合を実行する SQL UDF を定義し、レポート テーブルの DLT 期待値のレポート キー値に null 値が返されるかどうかを確認します。
D) validation_copyとレポートに対して左外部結合を実行するビューを定義し、レポートテーブルのDLT期待値でこのビューを参照します。


3. データ エンジニアは、広告インプレッション (広告が表示されたとき) のストリームと、広告に対するユーザーのクリックの別のストリームを結合して、インプレッションがいつ収益化可能なクリックにつながったかを相関させたいと考えています。
以下のコードでは、Impressionsはウォーターマーク(「event_time」、「10 minutes」)付きのストリーミングデータフレームです。

データ エンジニアは、クエリの速度が大幅に低下していることに気付きました。
どのソリューションがパフォーマンスを向上させるでしょうか?

A) イベント時間制約に参加: clickTime + 3 時間 < impressionTime - 2 時間
B) イベント時間制約に参加: clickTime >= impressionTime かつ clickTime <= impressionTime 間隔 1 時間
C) イベント時間制約での結合: clickTime == impressionTime を leftOuter 結合で使用
D) イベント時間制約に参加: clickTime >= impressionTime - 間隔 3 時間、透かしを削除


4. データエンジニアは、共同ワークスペース内のDatabricksジョブのACLを構成する際に、最小権限の原則を適用したいと考えています。データエンジニアはどのようなアプローチを採用すべきでしょうか?

A) フォルダー レベルの権限のみを使用し、個々のジョブに権限を設定することは避けてください。
B) アクセスの問題を回避するために、すべてのユーザーにすべてのジョブに対する CAN MANAGE 権限を付与します。
C) 各ジョブでの役割に必要な最小限の権限レベル (例: CAN RUN または CAN VIEW) のみをユーザーに割り当てます。
D) すべてのユーザーに CAN RUN 権限を付与し、単一の管理グループに CAN MANAGE 権限を付与します。


5. データ エンジニアは、ひどく偏った国別の履歴パーティションを持つ Delta テーブルを継承します。
クエリは多くの場合、高カーディナリティの customer_id でフィルタリングされ、時間の経過とともにディメンション間で変化します。エンジニアは、混乱を招く完全な書き換えを回避し、偏ったパーティションの影響を軽減し、アクセスパターンの変化に応じて優れたクエリパフォーマンスを維持する戦略を求めています。データエンジニアが実行すべき2つのアクションはどれですか?(2つ選択してください。)

A) 既存のパーティションを保持し、ビンパッキング OPTIMIZE のみに依存します。多次元フィルターでは ZORDER とクラスタリングは不要です。
B) メンテナンスのオーバーヘッドを回避するためにデータ スキップ統計を無効にし、代わりに適応型クエリ実行に依存します。
C) 静的パーティショニングからリキッド クラスタリングに切り替えて、customer_id などの一般的なフィルターを反映する初期クラスタリング キーを選択します。
D) 最適化された書き込みのみに依存します。Databricks は時間の経過とともにパーティション分割をクラスタリングに自動的に置き換えます。
E) OPTIMIZE table_name を定期的に実行します。


Solutions:

Question # 1
Answer: A
Question # 2
Answer: D
Question # 3
Answer: B
Question # 4
Answer: C
Question # 5
Answer: C,E

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