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iStrobe Online Help

DSNB1GET

モジュールDSNB1GETは、バッファーマネージャーコンポーネントを構成しています。要求されたページの仮想アドレス化を可能にします。

Db2データは、ページセットと呼ばれる、線形のアドレス可能なDASDデータセット集合に格納されます。ページセット内で、データはページと呼ばれる固定サイズのユニットに格納されます。このデータを処理するDb2機能は、ページセットには直接アクセスせずに、対象ページの仮想記憶域のコピーを操作します。

ヒント

DSNB1GETの実行時間が長い場合は、大量の行がバッファープールからプログラムに移動されたことを示します。述部に制限を加えて、メモリー間の移動数を削減し、プログラムに返されるデータのページ数を制限してください。

参考資料

『IBM Db2 for OS/390, Administration Guide（SC26-8957）』

『IBM Db2 for OS/390 Messages and Codes（GC26-8970）』