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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Database storage structures ： ウィキペディア英語版 Database storage structures Database tables and indexes may be stored on disk in one of a number of forms, including ordered/unordered flat files, ISAM, heap files, hash buckets, or B+ trees. Each form has its own particular advantages and disadvantages. The most commonly used forms are B+ trees and ISAM. Such forms or structures are one aspect of the overall schema used by a database engine to store information. ==Unordered== Unordered storage typically stores the records in the order they are inserted. Such storage offers good insertion efficiency ($O\backslash left(1\backslash right)$), but inefficient retrieval times ($O\backslash left(n\backslash right)$). Typically these retrieval times are better, however, as most databases use indexes on the primary keys, resulting in retrieval times of $O\backslash left(\backslash log\; n\backslash right)$ or $O\backslash left(1\backslash right)$ for keys that are the same as the database row offsets within the storage system. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Database storage structures」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.