Ein Optimierer für GReQL2
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Diplomarbeit aus dem Jahr 2008 im Fachbereich Informatik - Programmierung, Note: 1,0, Universität Koblenz-Landau (Institut für Softwaretechnik), Sprache: Deutsch, Abstract: Im Rahmen dieser Diplomarbeit wird ein Optimierer für die TGraphen-Anfragesprache GReQL2 entworfen und implementiert. GReQL2 besteht im wesentlichen aus drei Komponenten: dem Parser, dem Auswerter und dem Optimierer. Der Parser wurde bereits in [Mar06] von Katrin Marchewka implementiert, und der Auswerter ist Resultat von Daniel Bildhauers Diplomarbeit ([Bil06]). Der in der vorliegenden Arbeit entwickelte Optimierer besitzt eine Komponente zum Loggen von Auswertungsgrö en, ein Kostenmodell, welches auf Basis der geloggten Erfahrungswerte die Auswertungskosten einer Anfrage abschätzen kann, einen Mechanismus zur Wiederverwendung bereits optimierter Syntaxgraphen und eine Reihe von Transformationen, die einen gegebenen GReQL2-Syntaxgraphen derart umformen, dass er effizienter ausgewertet werden kann. Dabei sind einige dieser Transformationen ganz speziell auf die Sprache GReQL2 abgestimmt während andere Adaptionen von bekannten Optimierungsstrategien (z.B. "Selektion so früh wie möglich" bei der algebraischen Optimierung in relationalen Datenbanksystemen) darstellen. Der in der vorliegenden Diplomarbeit entwickelte Optimierer hat sich mittlerweile im Produktiveinsatz innerhalb der TGraphen-Bibliothek JGraLab des Instituts für Softwaretechnik an der Universität Koblenz-Landau bewährt.
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