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Question 7: DBファイルの大量の待機数は散乱し読み取り、DBファイルのシーケンシャルは最近の自動
データベース診断モニター(ADDM)レポートにイベントを読み取ることを確認します。更
なる調査した後、クエリがあまりにも多くの全表スキャンを実行しているとインデックスは
フィルタ列がインデックスされていても使用されていないことがわかります。
3つの可能な理由を識別してください。
A. 欠落または失効したヒストグラム統計
B. 過小共有プール
C. インデックスの高クラスタ化係数
D. DB_FILE_MULTIBLOCK_READ_COUNTパラメータの高い値
E. 特大バッファキャッシュ
Correct Answer: A C D
Explanation
D: DB_FILE_MULTIBLOCK_READ_COUNT is one of the parameters you can use to
minimize I/O during table scans. It specifies the maximum number of blocks read in one I/O
operation during a sequential scan.
The total number of I/Os needed to perform a full table scan depends on such factors as the
size of the table, the multiblock read count, and whether parallel execution is being utilized
for the operation.
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