New PDF release: Performance Tuning für Oracle-Datenbanken: Methoden aus der

By Leonid Nossov

ISBN-10: 3642330525

ISBN-13: 9783642330520

ISBN-10: 3642330533

ISBN-13: 9783642330537

Stellen Sie sich vor, Ihre Datenbank lahmt plötzlich oder steht gar. Es kann auch sein, dass einige Anwendungsteile zu langsam sind, und Sie wissen nicht, warum. Wie klärt guy die Ursache schlechter functionality und wie beseitigt guy sie am effektivsten? Welche Möglichkeiten bietet Oracle? Welche anderen nicht oder nur spärlich beschriebenen Methoden und tips kann guy anwenden, damit Ihre Datenbank wieder richtig „tickt“? Aus diesem Blickwinkel betrachtet der Autor varied Oracle-Features. Sie sind auch mit Test-Cases versehen, so dass der Leser selbst deren „Tiefen“ untersuchen kann. Da „machs-wie-ich“ eine der besten Lehrmethoden ist, sind zahlreiche Fälle im Buch präsentiert, die direkt für die Praxis umsetzbar sind. Die begleitende Webseite bietet Test-Cases für einige positive factors sowie SQL- und PLSQL-Skripte für functionality Tuning.

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Extra resources for Performance Tuning für Oracle-Datenbanken: Methoden aus der Praxis für die Praxis

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Du sagtest, dass solche Fälle für die Analyse schwierig sind. : „Stelle Dir vor, dass eine lange Kette der Foreign Key Constraints die Master- und die Detail-Tabelle miteinander verbindet. Und irgendwo am Ende dieser Kette ein Index fehlt. Das ist ziemlich mühsam manuell zu ermitteln. : „Wenn dieses Skript sehr viele Indices findet, kann es problematisch sein. Nachdem ich ein paar aufwendige Analysen durchgeführt habe, habe ich entschieden, die nächste Analyse lieber mit einem Skript zu machen.

Normalerweise wird ein einziger Datenblock jeweils dabei gelesen. Am häufigsten tritt dieses Warteereignis bei Index Scans auf (außer Fast Full Index Scan) und bei Tabellenzugriffen über die Rowid. Im Prinzip ist es normal, dass man die Wartezustände für „db file sequential read“ beobachtet. Man muss eingreifen, wenn diese Wartezeit gravierend wird. In solchen Fällen hilft am häufigsten das SQL-Tuning. Wenn das System CPU-mäßig noch Reserven hat, könnte man in einigen Fällen den Buffer Cache vergrößern oder die betroffenen Segmente in einem Keep Pool verwalten.

Mit diesen Methoden soll das Buch etwas mehr Routine in das Performance Tuning bringen. Spaßeshalber möchte ich das Sägen als Symbol des Performance Tuning und die Säge als Symbol eines Tool für Performance Tuning benutzen (eine Axt als solches Symbol ist mir einfach zu brutal). Dieses Symbol finden Sie auf den Abbildungen, die im weiteren Text auf eine lockere Art und Weise einige Seiten des Performance Tuning illustrieren. 4 Warum mögen manche Datenbankadministratoren das … 15 Das Performance Tuning attraktiver und beliebter zu machen, ist eins der Ziele dieses Buches.

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Performance Tuning für Oracle-Datenbanken: Methoden aus der Praxis für die Praxis by Leonid Nossov


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