Zuverlässigkeit Und Leistungsfähigkeit Objekt-Orientierter Datenbanksysteme
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Objekt-orientierte Datenbanksysteme werden von vielen Forschern als die "n{chste Generation" der Datenbanktechnologie insbesondere in den ingenieurwissenschaftlichen Anwendungsgebieten gesehen. Obwohl sie in ihrer Funktionalit{t den relationalen Systemen }berlegen sind, werden sich Objektbanksysteme aber nur dann durchsetzen knnen, wenn sie in bezug auf Zuverl{ssigkeit und Leistungsf{higkeit den marktg{ngigen relationalen Systemen zumindest ebenb}rtig werden. Die vorliegende Arbeit leistet einen Beitrag hinsichtlich beider Aspekte: 1. Zuverl{ssigkeit Es wird ein Typisierungskonzept f}r die strenge Typisierung der Sprache eines (persistenten) Objektmodells entwickelt, das die vollst{ndige statische Typverifikation ermglicht, ohne die Flexibilit{t und Expressivit{t des Modells einzuschr{nken. 2. Leistungsf{higkeit Es werden zugriffsunterst}tzende Ma nahmen vorgestellt, die in streng typisierte Objektmodelle integriert werden knnen, um die assoziative Suche nach persistenten Objekten (auf dem Hintergrundspeicher) zu optimieren. Hierzu werden zwei neuartige - speziell auf die Erfordernisse objektorientierter Datenmodelle ausgerichtete - Zugriffsunterst}tzungsverfahren entwickelt, die viele aus der Literatur bekannte Indexierungsverfahren als Spezialf{lle abdecken. F}r beide Zugriffsunterst}tzungsstrukturen wurden quantitative Bewertungen durchgef}hrt. Ein weiterer wesentlicher Gesichtspunkt ist die Einbeziehung dieser Indexierungsverfahren in die Anfrageauswertung des objekt-orientierten Datenbanksystems. Hierzu wird ein regelbasierterAnfrageoptimierer vorgestellt.
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