JP2013175181A - エンコードされたトリプルを格納するデータベース、装置及び方法 - Google Patents
エンコードされたトリプルを格納するデータベース、装置及び方法 Download PDFInfo
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Abstract
【解決手段】 本発明の実施形態は、トリプルとしてエンコードされたグラフデータのデータベースであって、各トリプルは、主語、述語及び目的語を有し、各トリプルは該トリプルのデータに従って順序付けられたデータアイテムのセットの中のデータアイテム内に格納され、分散型ノードネットワークの複数のノードに渡って分散され、前記データアイテムの各々がマッピングされるノードは、前記順序付けられたセット内のデータアイテムの位置に依存し、各トリプルは、データアイテム内で主語が述語及び目的語より前にある第1の構成、データアイテム内で述語が主語及び目的語より前にある第2の構成、データアイテム内で目的語が主語及び述語より前にある第3の構成、のうちのそれぞれ異なる構成を有する2以上のデータアイテム内に格納される、データベースを提供する。
【選択図】 図1
Description
任意的に、上述のKVS実装では、前記追加情報は、リード及び/又はライトアクセスが前記キー値ペアに格納されたRDFトリプルに対して行われるとき通知を受信するために登録されるアプリケーションのリストを含む。さらに、追加情報は、コンテナを格納するノードによる実行のためにソフトウェアコードを有しても良い。例えば、ソフトウェアコードは、特定のイベントに応答して格納され呼び出されても良い。また、ソフトウェアコードの引数もコンテナに格納される。例えば、値は、ソフトウェアコードのブロックを更新関数として格納しても良い。関連付けられたトリプルが更新されるとき、更新関数が呼び出され、他のトリプルのリスト及びそれらの場所が引数である。他のトリプルのリストは、クライアントアプリケーションがトリプルを、特定のイベントと関連付けられたコンテナ内のリストに追加することにより、生成されても良い。
http://dbpedia.org/resource/Aristotle
本実施形態のネットワークノード10により受信される範囲クエリは、この主語を1番目の要素として有する全てのデータアイテムを検索するためのクエリである。より一般的には、クエリを実行するために、range_query()プロシジャは、辞書順に比較可能な2つのキー、つまり下限と上限を受信する。この特定の例のクエリでは、<S,P,O>エンコーディングが効率的である。プロシジャは、下端のキーと上端のキーとの間の全てのキーを検索する。しかしながら、クエリは、自身にリンク付けられた次のURLで特定されるリソースを有するデ―タベース内の全てのリソースのリストを検索しても良い。
http://dbpedia.org/resource/Stageira
したがって、特定されるURLは目的語として問い合わせられ、同じ目的語を有するデータアイテムは<S,P,O>エンコーディングで連続的に順序付けられないので、<S,P,O>エンコーディングは効率的ではない。しかしながら、例えば<O,P,S>エンコーディングにより、効率的になり得る。したがって、本発明の実施形態は、コンピュータ的に効率的な方法で実行できるクエリのプールを広げる。
<S,P,O>、<P,O,S>、<O,S,P>
このようにトリプルを3回格納することは、クエリの種類に拘わらず、データベースが同じ効率で任意のクエリを実行できるようにし、トリプルが必然的に複製され障害の場合に情報を再構成できるという更なる利点を有する。勿論、これらの利点は、格納されている各トリプルの3つのバージョンに依存しない。各トリプルの2つのバージョンを格納することも幾つかの利点をもたらし得る。KVSの実施形態では、トリプルの各バージョンは、同じ値にリンク付けされても良い。
12 ラッパAPI
14 RDFプロセッサ
16 分散型キー値ストア
20 クライアントアプリケーション
22 データフィード
30 関係型データベース
40 連合グラフデータベース
101 記憶ユニット
Claims (15)
- トリプルとしてエンコードされたグラフデータのデータベースであって、各トリプルは、主語、述語及び目的語を有し、各トリプルは該トリプルのデータに従って順序付けられたデータアイテムのセットの中のデータアイテム内に格納され、分散型ノードネットワークの複数のノードに渡って分散され、
前記データアイテムの各々がマッピングされるノードは、前記順序付けられたセット内のデータアイテムの位置に依存し、
各トリプルは、
データアイテム内で主語が述語及び目的語より前にある第1の構成、
データアイテム内で述語が主語及び目的語より前にある第2の構成、
データアイテム内で目的語が主語及び述語より前にある第3の構成、
のうちのそれぞれ異なる構成を有する2以上のデータアイテム内に格納される、
データベース。 - 各データアイテムは、対応するトリプルの主語、述語及び目的語を有するストリングオブジェクトを含む、請求項1に記載のデータベース。
- 前記データアイテムは、前記ストリングオブジェクトのアルファベット順の比較に従って順序付けられる、請求項2に記載のデータベース。
- 各前記データアイテムは、キー値体系内のキー値ペアのキーである、請求項1乃至3のいずれか一項に記載のデータベース。
- 複数の前記キー値ペアの各々の値は、キーに格納されたトリプルに関連する追加情報を有する、請求項4に記載のデータベース。
- 前記追加情報は、アプリケーションのアイデンティティに依存して前記データベースにアクセスする前記アプリケーションに利用可能にされるデータである、請求項5に記載のデータベース。
- 前記追加情報は、リード及び/又はライトアクセスが前記キー値ペアに格納されたトリプルに対して行われるとき通知を受信するために登録されるアプリケーションのリストを含む、請求項5又は6に記載のデータベース。
- 各キー値ペアの値は、アプリケーションに前記通知を登録及び/又は登録解除させるアプリケーションプログラミングインタフェース(API)を含む、請求項7に記載のデータベース。
- 各キー値ペアの値は、前記追加情報へのアクセスを管理するアプリケーションプログラミングインタフェース(API)を含む、請求項5乃至8のいずれか一項に記載のデータベース。
- 前記追加情報は、値が格納されているノードにより実行されるためのソフトウェアコードを含む、請求項5乃至9のいずれか一項に記載のデータベース。
- 各前記データアイテムは、順序付けたハッシュテーブルを用いてノードにマッピングされる、請求項1乃至10のいずれか一項に記載のデータベース。
- 前記順序付けたハッシュテーブルは、コンシステントハッシュ関数を用いる、請求項11に記載のデータベース。
- 前記データベースは1又は複数の他のデータベースによりアクセス可能であり、
前記追加情報は、
前記キー値ペアに格納されたトリプルにより表される情報を含む1又は複数の他のデータベースの間のデータベースのリスト、
リストされた各データベースに対して、前記キー値ペアに格納されたトリプルに含まれる情報が、該リスとされたデータベースに対して動作するアプリケーションにより更新されるようにするコネクタ、
を含む、請求項5乃至12のいずれか一項に記載のデータベース。 - 分散型ノードネットワークのノードとして動作するよう構成されるコンピューティング装置であって、前記コンピューティング装置は、トリプルとしてエンコードされたグラフデータのデータベースのサブセットを格納し、各トリプルは、主語、述語及び目的語を有し、各トリプルは該トリプルのデータに従って順序付けられたデータアイテムのセットの中のデータアイテム内に格納され、前記分散型ノードネットワークの複数のノードに渡って分散され、
前記データアイテムの各々がマッピングされるノードは、前記順序付けられたセット内のデータアイテムの位置に依存し、
各トリプルは、
データアイテム内で主語が述語及び目的語より前にある第1の構成、
データアイテム内で述語が主語及び目的語より前にある第2の構成、
データアイテム内で目的語が主語及び述語より前にある第3の構成、
のうちのそれぞれ異なる構成を有する2以上のデータアイテム内に格納される、
コンピューティング装置。 - コンピューティング装置により実行されると、前記コンピューティング装置に請求項14に記載のコンピューティング装置として動作させる、コンピュータプログラム。
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JP2013246828A (ja) | 2013-12-09 |
US9251232B2 (en) | 2016-02-02 |
US20130238667A1 (en) | 2013-09-12 |
CN103425734A (zh) | 2013-12-04 |
JP6119421B2 (ja) | 2017-04-26 |
US9442994B2 (en) | 2016-09-13 |
US20140067762A1 (en) | 2014-03-06 |
CN103425734B (zh) | 2017-06-27 |
JP6123339B2 (ja) | 2017-05-10 |
EP2631819A1 (en) | 2013-08-28 |
EP2631817A1 (en) | 2013-08-28 |
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