In a hierarchical database hdbms , you begin with a strictly defined tree of data nodes 在層次數(shù)據(jù)庫( hdbms )中,首先是從嚴(yán)格定義的數(shù)據(jù)節(jié)點(diǎn)樹開始的。
But in dtds oriented more to data records , an xml document could be as rigid as a hierarchical database 但dtd更多地是面向數(shù)據(jù)記錄, xml文檔和層次數(shù)據(jù)庫可以一樣嚴(yán)格。
This goal is accomplished almost automatically in hierarchical databases , but takes work in relational ones 這個(gè)目標(biāo)在層次數(shù)據(jù)庫中幾乎是自動(dòng)完成的,但在關(guān)系數(shù)據(jù)庫中需要做些工作。
In hierarchical databases , data access is utterly predictable in structure ; therefore both retrieval and updates can be highly optimized by a dbms 在層次數(shù)據(jù)庫中,數(shù)據(jù)訪問在結(jié)構(gòu)上是完全可預(yù)測(cè)的;因此dbms可以高度優(yōu)化檢索和更新。
The ibm information management system is ibms premier transaction and hierarchical database management system , the product of choice for critical online operational applications and data where support for high availability , performance , capacity , integrity , and low cost are key factors Ims是ibm最早的事務(wù)和層次數(shù)據(jù)庫管理系統(tǒng),它非常適合支持高可用性、高性能、高容量、高完整性和低成本的關(guān)鍵性聯(lián)機(jī)操作應(yīng)用程序和數(shù)據(jù)。
Learn how the ibm information management system , ibms premier transaction and hierarchical database management system , is focusing on enterprise modernization through integration and open access with a service - oriented architecture available on demand Ibm信息管理系統(tǒng)( ibm information management system , ims )是ibm最早的事務(wù)和層次數(shù)據(jù)庫管理系統(tǒng)。本文學(xué)習(xí)它如何通過利用一個(gè)隨需應(yīng)變、面向服務(wù)的體系架構(gòu)來進(jìn)行集成和開放訪問從而達(dá)到企業(yè)的現(xiàn)代化。