JP6639420B2 - フラッシュ最適化データ・レイアウトのための方法、フラッシュ最適化記憶のための装置、およびコンピュータ・プログラム - Google Patents
フラッシュ最適化データ・レイアウトのための方法、フラッシュ最適化記憶のための装置、およびコンピュータ・プログラム Download PDFInfo
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Description
Claims (13)
- クエリに対するデータセットのフラッシュ最適化データ・レイアウトのための方法であって、
プロセッサによって、選択最適化レイアウトに従って、選択列をフラッシュ・メモリに記憶するステップを含み、
前記選択最適化レイアウトは、述語マッチングおよびデータ・スキッピングを最適化するように構成され、
前記選択最適化レイアウトは、選択列ごとに、
一意なデータ値で満たされた選択列辞書を所与の選択列に記憶するステップであって、前記一意なデータ値は、ソート順序で前記選択列辞書に記憶される、前記記憶するステップと、
前記所与の選択列に2回以上現れる前記一意なデータ値のいずれも重複して記憶することなく、前記一意なデータ値が前記所与の選択列内に存在する各々の行位置に対応する行位置指定を記憶するステップと
によって形成される、方法。 - 前記選択最適化レイアウトは、前記所与の選択列に対し、前記行位置指定において同一の一意なデータ値を有する個々の行位置に対する単一のオフセットを記憶することによって形成される、請求項1に記載の方法。
- 前記同一の一意なデータ値を有する前記個々の行位置は、前記行位置指定内で同一のメモリ位置に記憶される、請求項2に記載の方法。
- 前記同一の一意なデータ値に対する一致によって、前記同一の一意なデータ値を有しない他の個々の行位置を読み取る必要なく、前記個々の行位置の各々が前記同一のメモリ位置から読み取られるように、前記個々の行位置は各々、前記所与の選択列における前記同一の一意なデータ値に対応する、請求項3に記載の方法。
- 射影最適化レイアウトに従って、射影列を前記フラッシュ・メモリに記憶するステップをさらに含み、前記射影最適化レイアウトは、前記射影列へのランダム・アクセスを最適化するように構成され、
前記射影最適化レイアウトは、射影列ごとに、
一意なデータ値で満たされた射影列辞書を所与の射影列に記憶することであって、前記一意なデータ値は、ソート順序で前記射影列辞書に記憶される、前記記憶することと、
前記所与の射影列に2回以上現れる前記一意なデータ値のいずれも重複して記憶することなく、前記一意なデータ値の各々に対する行位置ごとのインデックスを含むルックアップ構造を前記所与の射影列に記憶することと
によって形成される、請求項1に記載の方法。 - 前記射影最適化レイアウトは、前記所与の射影列に対し、前記所与の射影列における全ての行位置を読み取る必要なく、個々の行位置が読み取られるように、前記所与の射影列において同一の一意なデータ値を有する前記個々の行位置に対するインデックスを前記ルックアップ構造に記憶することによって形成される、請求項5に記載の方法。
- 前記射影最適化レイアウトは、前記所与の射影列に対し、前記所与の射影列において別の同一の一意なデータ値を有する他の個々の行位置に対する他のインデックスを前記ルックアップ構造に記憶することによって形成される、請求項6に記載の方法。
- 前記データセットに対して実行されることになるクエリを受け取るステップであって、
前記クエリは射影部および選択部を含む、前記受け取るステップと、
前記選択部を実行するステップと、次いで前記クエリの前記射影部を実行するステップと
をさらに含み、
前記選択部は、前記選択部におけるルールに従って一致することになる述語を含み、
前記射影部は、前記一意なデータ値を前記データセットから取り出すための要件を含む、請求項1に記載の方法。 - 前記選択部を実行するステップは、前記述語の範囲外にある統計を有する行グループをスキップするために前記所与の選択列に対する行グループの統計を読み取るステップを含み、前記所与の選択列の前記行グループに対する前記統計を読み取るステップは、前記読み取り時に前記行グループにおける前記一意なデータ値を読み取る必要なく実行され、
前記行グループは、ともにグループ化されている前記所与の選択列における行であり、
前記選択部を実行するステップは、さらに、
スキップされていない前記所与の選択列の残りの行グループに対し、前記所与の選択列の前記残りの行グループに対する前記選択列辞書における前記一意なデータ値を、各スレッドが個々の行グループを処理するマルチスレッド方式で取り出すステップと、
一致する一意な値を発見するために前記残りの行グループに対する前記選択列辞書における前記一意なデータ値に対して前記述語の述語マッチングを実行するステップと、
前記所与の選択列における前記一致する一意な値に対する行位置のみを取り出すステップと
を含む、請求項8に記載の方法。 - 前記クエリの前記射影部を実行するステップは、前記一致する一意な値を取り出すために前記一致する一意な値に対する前記行位置の各々に対するオフセットを取り出すステップと、
前記クエリに対する回答を返すために前記行位置の前記一致する一意な値に関する前記クエリの前記射影部における要件を実行するステップと
を含む、請求項9に記載の方法。 - クエリに対するデータセットのフラッシュ最適化記憶のための装置であって、
請求項1〜10の何れか1項に記載の方法の各ステップを実行する、コンピュータ・ハードウェアによる手段を備える、装置。 - 請求項1〜10の何れか1項に記載の方法の各ステップをコンピュータに実行させる、
コンピュータ・プログラム。 - 請求項12に記載の前記コンピュータ・プログラムをコンピュータ可読記憶媒体に記憶した、コンピュータ可読記憶媒体。
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