JP6511438B2 - 連続データストリームにおけるリレーションに対する値ベースのウィンドウ - Google Patents
連続データストリームにおけるリレーションに対する値ベースのウィンドウ Download PDFInfo
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Description
従来のデータベースシステムにおいて、データは、通常はテーブルの形態である1つ以上のデータベースに記憶される。そして、記憶されるデータは、構造化照会言語(SQL)などのデータ管理言語を使用して照会および操作される。たとえば、SQLクエリは、データベースに記憶されるデータから関連するデータを識別するために定義および実行され得る。したがって、SQLクエリは、データベースに記憶されるデータの有限集合に対して実行される。さらに、SQLクエリが実行される時、それはひとたび有限データ集合に対して実行され、有限の静的結果(finite static result)を作成する。したがって、データベースは、有限の記憶されるデータ集合に対してクエリを実行するように最良に実装される。
一部の例において、リレーションに対する値ベースのウィンドウを管理するための方法が提供される。方法は、入力リレーションを識別する連続クエリを受信することを含み得る。1つの例において、入力リレーションは、アプリケーションに関連するデータレコードの有界集合である。そして、方法は、入力リレーションの処理に関連付けられるコンフィギュラブルウィンドウ演算子(configurable window operator)を識別することを含み得る。加えて、方法は、出力リレーションを生成するために少なくとも部分的にコンフィギュラブルウィンドウ演算子に基づいて連続クエリを実行することを含み得る。一部の局面において、方法は、連続クエリの実行に少なくとも部分的に基づいて出力リレーションのデータレコードを提供することも含み得る。
以下の説明において、様々な実施形態が記載される。説明を目的として、実施形態についての完全な理解を提供するために、具体的な構成および詳細が述べられる。しかしながら、具体的な詳細がなくとも実施形態が実施され得ることは当業者にとって明らかである。さらにまた、周知の特徴は、記載される実施形態を不明瞭にしないために、省略もしくは簡易化され得る。
(<timestamp_N+1>,<ORCL,62>)
(<timestamp_N+2>,<PCAR,38>)
(<timestamp_N+3>,<SPOT,53>)
(<timestamp_N+4>,<PDCO,44>)
(<timestamp_N+5>,<PTEN,50>)
上記のストリームにおいて、ストリーム要素(<timestamp_N+1>,<ORCL,62>)については、イベントは、「stock_symbol」および「stock_value」を伴う<ORCL,62>である。ストリーム要素に関連付けられるタイムスタンプは、「timestamp_N+1」である。したがって、連続イベントストリームはイベントのフローであり、各イベントは同じ一連の属性を有する。
・CQLエンジンゲートウェイとしてBI分析サーバーのためのリモーティングサービス
・イベントソース/シンクアダプター
・論理SQLにCQL拡張を加えたものからのデータ定義言語(DDL)の生成
・すべてのタイプの連続クエリおよび実施選択のための統一モデルの提供
・メタデータおよびサポート再開可能性の維持
・高い利用可能性およびスケーラビリティのサポート
加えて、一部の例において、OIは、事業実施に対して可視性および見識をもたらすリアルタイムの動的事業分析の形態である。大量の情報から理解可能とすることを助けるという点において、OIは、BIもしくはリアルタイムBIに対してリンクもしくは比較されることが多い。しかしながら、いくつかの基本的な違いがある。OIは、主に活動中心的であり得て、BIは主にデータ中心的であり得る。加えて、OIは、進展する状況(たとえば、傾向およびパターン)を検知する、およびこれに対応するのにより適し得て、これに対してBIは、事後ベースおよび報告ベースの手法として従来より使用され得る。
特定の実施形態において、「ジェネリック値」ウィンドウ演算子は、入力リレーションにおける対応するデータレコードのタイムスタンプtに対する「range val」である特定の範囲内に属性「attr」値がある入力リレーションからのデータレコードの部分集合を含む出力リレーションを作り得る。CQLクエリにおける入力リレーションに対して「ジェネリック値」ウィンドウオペレーターが定義され得る方法の例示的な動作は以下に詳細に記載される。
一実施形態において、「現在時間値」ウィンドウ演算子は、入力リレーションにおける対応するデータレコードのタイムスタンプtに対する「CurrentHour」である現在時間に属性「attr」値がある入力リレーションからのデータレコードの部分集合を含む出力リレーションを作り得る。CQLクエリにおける入力リレーションに対して「現在時間値」ウィンドウ演算子が定義され得る方法の例示的な動作は以下に詳細に記載される。
一実施形態において、「現在期間値」ウィンドウ演算子は、入力リレーションにおける対応するデータレコードのタイムスタンプtに対する「CurrentPeriod」である現在時間期間内に属性「attr」値がある入力リレーションからのデータレコードの部分集合を含む出力リレーションを作り得る。CQLクエリにおける入力リレーションに対して「CurrentPeriod」ウィンドウ演算子が定義され得る方法の例示的な動作は、以下により詳細に記載される。
この定義により、入力リレーション「CallCentreRecords」は、第1の属性「callerName」および第2の属性「callTime」という2つの属性と、タイムスタンプとを含む。1つの例において、入力リレーション「CallCentreRecords」は、コールセンターからのコール詳細記録に関連する連続データストリームを記憶し得る。ここで使用される「コールセンター」は、典型的に、カスタマーサービスの代表者が電話を介してカスタマーにサービスを提供し得るサービスネットワークをいう。コールセンターからの連続データストリームは、典型的に、短い時間間隔で要約されるコールに関連するコールバイコール(call-by-call)情報を含み得る。このようなコールバイコール情報は、たとえば、データベースにコールが記録もしくは受信される場合のためのタイムスタンプ、呼出元名、コールが行なわれた時間などを含み得る。
上に示されるCQLクエリにより、コンフィギュラブルウィンドウ演算子は、「ジェネリック値」ウィンドウ演算子303として識別される。そして、CQlクエリは、「CallCenterRecords」入力リレーション302における属性「callTime」に対して「RANGE 1 HOUR」ウィンドウ演算子を適用することによって「ジェネリック値」ウィンドウ演算子303に少なくとも部分的に基づいて実行され、出力リレーションが生成される。「RANGE 1 HOUR」ウィンドウ演算子303を適用した結果として生成される出力リレーション304も図3に示される。
上に示されるCQLクエリにより、コンフィギュラブルウィンドウ演算子は「現在時間」ウィンドウ演算子403として識別される。そして、CQLクエリは、「CallCenterRecords」入力リレーション402における属性「callTime」に対して「CurrentHour」ウィンドウ演算子403を適用することによって「現在時間」ウィンドウ演算子に少なくとも部分的に基づいて実行され、出力リレーションが生成される。「CurrentHour」ウィンドウ演算子403を適用した結果として生成される出力リレーション404は、図4に示される。
上に示されるCQLクエリにより、コンフィギュラブルウィンドウ演算子は、「現在期間」ウィンドウ演算子503として識別される。そして、CQLクエリは、「CallCenterRecords」入力リレーション502における属性「callTime」に対して「CurrentPeriod」ウィンドウ演算子503を適用することによって「CurrentPeriod」ウィンドウ演算子503に少なくとも部分的に基づいて実行され、出力リレーションが生成される。「CurrentPeriod」ウィンドウ演算子503を適用した結果として生成される出力リレーション504も図5に示される。
Claims (7)
- コンピュータで実行される方法であって、
アプリケーションに関連する連続入力データストリームを受信することと、
前記連続入力データストリームから入力リレーションを生成することとを含み、
前記入力リレーションは、前記連続入力データストリームのデータレコードの有界集合であり、方法はさらに、
前記入力リレーションを識別する連続クエリを受信することと、
前記入力リレーションの処理に関連付けられるコンフィギュラブルウィンドウ演算子を識別することと、
前記入力リレーションの属性を前記コンフィギュラブルウィンドウ演算子に適用することによって前記連続クエリを実行して出力リレーションを生成することとを含み、
前記属性は、前記入力リレーションに関連付けられたイベントの特性を含み、前記方法は、さらに、
前記コンフィギュラブルウィンドウ演算子によって定義された、前記入力リレーションに前記イベントが挿入された時間から特定時間範囲内において前記イベントが発生したか否かを判断することと、
前記イベントが前記特定時間範囲内に発生したか否かの判断結果に応じて、前記出力リレーションに対して前記イベントを挿入するか、または、前記出力リレーションから前記イベントを取り除くことと、
前記出力リレーションのデータレコードを提供することとを含み、
前記出力リレーションは、前記イベントが前記特定時間範囲内に発生したことに基づいて挿入された当該イベントを含む、コンピュータで実行される方法。 - 前記入力リレーションは、過去データのデータベースに記憶される前記アプリケーションに関連する情報に少なくとも部分的に基づいて生成される外部データソースである、請求項1に記載のコンピュータで実行される方法。
- 前記入力リレーションは、前記アプリケーションに関連する1つ以上のアーカイブされたリレーションに少なくとも部分的に基づいて生成される外部データソースである、請求項1または2に記載のコンピュータで実行される方法。
- 前記データレコードを提供することは、前記出力リレーションを表示することを含み、前記出力リレーションは、前記コンフィギュラブルウィンドウ演算子によって定義される特定の範囲内に属性値がある前記入力リレーションからの前記データレコードの部分集合を含む、請求項1〜3のいずれか1項に記載のコンピュータで実行される方法。
- 1つ以上のプロセッサーによって実行可能な複数の命令を含むコンピュータ読取可能プログラムであって、前記複数の命令は、
前記1つ以上のプロセッサーに、アプリケーションに関連する連続入力データストリームを受信させる命令と、
前記1つ以上のプロセッサーに、前記連続入力データストリームから入力リレーションを生成させる命令と、
前記1つ以上のプロセッサーに、前記入力リレーションを識別する連続クエリを受信させる命令と、
前記1つ以上のプロセッサーに、前記入力リレーションの処理に関連付けられるコンフィギュラブルウィンドウ演算子を識別させる命令と、
前記1つ以上のプロセッサーに、前記入力リレーションの属性を前記コンフィギュラブルウィンドウ演算子に適用することによって前記連続クエリを実行して出力リレーションを生成させる命令とを含み、
前記属性は、前記入力リレーションに関連付けられたイベントの特性を含み、前記複数の命令は、さらに、
前記1つ以上のプロセッサーに、前記コンフィギュラブルウィンドウ演算子によって定義された、前記入力リレーションに前記イベントが挿入された時間から特定時間範囲内において前記イベントが発生したか否かを判断させる命令と、
前記1つ以上のプロセッサーに、前記イベントが前記特定時間範囲内に発生したか否かの判断結果に応じて、前記出力リレーションに対して前記イベントを挿入するか、または、前記出力リレーションから前記イベントを取り除くかを判断させる命令と、
前記1つ以上のプロセッサーに、前記出力リレーションのデータレコードを提供させる命令とを含み、
前記出力リレーションは、前記イベントが前記特定時間範囲内に発生したことに基づいて挿入された当該イベントを含む、コンピュータ読取可能プログラム。 - システムであって、
複数の命令を記憶するメモリーと、
前記メモリーにアクセスするように構成される1つ以上のプロセッサーとを備え、前記1つ以上のプロセッサーは、前記複数の命令を実行するようにさらに構成され、前記複数の命令は少なくとも、
アプリケーションに関連する連続入力データストリームを受信し、
連続入力データストリームから入力リレーションを生成し、
前記入力リレーションを識別する連続クエリを受信し、
前記入力リレーションの処理に関連付けられるコンフィギュラブルウィンドウ演算子を識別し、
前記入力リレーションの属性を前記コンフィギュラブルウィンドウ演算子に適用することによって前記連続クエリを実行して出力リレーションを生成する命令を含み、
前記属性は、前記入力リレーションに関連付けられたイベントの特性を含み、前記複数の命令は、さらに、
前記コンフィギュラブルウィンドウ演算子によって定義された、前記入力リレーションに前記イベントが挿入された時間から特定時間範囲内において前記イベントが発生したか否かを判断し、
前記イベントが前記特定時間範囲内に発生したか否かの判断結果に応じて、前記出力リレーションに対して前記イベントを挿入するか、または、前記出力リレーションから前記イベントを取り除き、
前記出力リレーションのデータレコードを提供する命令を含み、
前記出力リレーションは、前記イベントが前記特定時間範囲内に発生したことに基づいて挿入された当該イベントを含む、システム。 - 前記1つ以上のプロセッサーは、前記出力リレーションを表示するようにさらに構成され、前記出力リレーションは、前記コンフィギュラブルウィンドウ演算子によって定義される特定の範囲内に属性値がある前記入力リレーションからの前記データレコードの部分集合を含む、請求項6に記載のシステム。
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20200145621A (ko) * | 2019-06-20 | 2020-12-30 | 쿠팡 주식회사 | 데이터 스트림의 실시간 처리를 위한 시스템 및 방법 |
KR20220002229A (ko) * | 2019-06-20 | 2022-01-06 | 쿠팡 주식회사 | 데이터 스트림의 실시간 처리를 위한 시스템 및 방법 |
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EP3005164A1 (en) | 2016-04-13 |
CN105308592B (zh) | 2017-12-19 |
JP2016524756A (ja) | 2016-08-18 |
US20140358959A1 (en) | 2014-12-04 |
CN105308592A (zh) | 2016-02-03 |
WO2014193943A1 (en) | 2014-12-04 |
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