{"created":"2025-01-18T22:49:35.495298+00:00","metadata":{"_oai":{"id":"oai:ipsj.ixsq.nii.ac.jp:00016272","sets":["581:913:919"]},"path":["919"],"owner":"11","recid":"16272","title":["関係データベースに対するデータアクセスの数式処理による最適化について"],"pubdate":{"attribute_name":"公開日","attribute_value":"1981-01-15"},"_buckets":{"deposit":"802c3f5d-2bae-45be-bd89-46afbb1270e4"},"_deposit":{"id":"16272","pid":{"type":"depid","value":"16272","revision_id":0},"owners":[11],"status":"published","created_by":11},"item_title":"関係データベースに対するデータアクセスの数式処理による最適化について","author_link":["361269","361268"],"item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"関係データベースに対するデータアクセスの数式処理による最適化について"},{"subitem_title":"Optimizing the Data Access to a Relational Data Base by Formula Manipulation","subitem_title_language":"en"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"論文（論文賞受賞）","subitem_subject_scheme":"Other"}]},"item_type_id":"2","publish_date":"1981-01-15","item_2_text_3":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"電子技術総合研究所ソフトウェア部情報システム研究室"}]},"item_2_text_4":{"attribute_name":"著者所属(英)","attribute_value_mlt":[{"subitem_text_value":"Information Systems Section, Computer Science Division, Electrotechnical Laboratory","subitem_text_language":"en"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"publish_status":"0","weko_shared_id":-1,"item_file_price":{"attribute_name":"Billing file","attribute_type":"file","attribute_value_mlt":[{"url":{"url":"https://ipsj.ixsq.nii.ac.jp/record/16272/files/IPSJ-JNL2201010.pdf","label":"IPSJ-JNL2201010"},"date":[{"dateType":"Available","dateValue":"1983-01-15"}],"format":"application/pdf","billing":["billing_file"],"filename":"IPSJ-JNL2201010.pdf","filesize":[{"value":"633.0 kB"}],"mimetype":"application/pdf","priceinfo":[{"tax":["include_tax"],"price":"660","billingrole":"5"},{"tax":["include_tax"],"price":"330","billingrole":"6"},{"tax":["include_tax"],"price":"0","billingrole":"8"},{"tax":["include_tax"],"price":"0","billingrole":"44"}],"accessrole":"open_date","version_id":"fa878b53-abaf-48d8-ac1d-a67fcf0c4664","displaytype":"detail","licensetype":"license_note","license_note":"Copyright (c) 1981 by the Information Processing Society of Japan"}]},"item_2_creator_5":{"attribute_name":"著者名","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"古川, 康一"}],"nameIdentifiers":[{}]}]},"item_2_creator_6":{"attribute_name":"著者名(英)","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Koichi, Furukawa","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_2_source_id_9":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00116647","subitem_source_identifier_type":"NCID"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourceuri":"http://purl.org/coar/resource_type/c_6501","resourcetype":"journal article"}]},"item_2_source_id_11":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"1882-7764","subitem_source_identifier_type":"ISSN"}]},"item_2_description_7":{"attribute_name":"論文抄録","attribute_value_mlt":[{"subitem_description":"近年 関係データベースの実用化を図るために 最適化に関する研究が数多くなされてきた.それらは 関係代数式上の等価変換によるものと インデックスや分類などのデータ表現を利用するより論理的なレベルの低い処理に分けられる.本論文では データ表現を利用する最適化の一部を より形式的に関係代数式上の等価変換によって実現する.データ表現としては 階后表現 多値従属による関係の分解 およびデータの冗長表現を考察の対象とする.階層表現は インデックスの役割を果すものであるが 本論文では 2段の階層表現上で 階層構造に沿った検索手続きが 関係代数式の変換操作によって得られることを示す.また 多値従属によって分解された関係に対するある種の除算が 分数の約分に相当する変換操作によって簡単化されることを示す.最後に データの冗長表現を利用した最適化も 同様の変換操作によって実現され それが定理の証明におけるlemmaの利用に相当していることを示す.","subitem_description_type":"Other"}]},"item_2_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicPageEnd":"75","bibliographic_titles":[{"bibliographic_title":"情報処理学会論文誌"}],"bibliographicPageStart":"68","bibliographicIssueDates":{"bibliographicIssueDate":"1981-01-15","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicVolumeNumber":"22"}]},"relation_version_is_last":true,"weko_creator_id":"11"},"id":16272,"updated":"2025-01-20T06:34:15.755673+00:00","links":{}}