Download Oracle9i fur den DBA . Effizient konfigurieren, optimieren by Uwe Herrmann, Dierk Lenz, Gunter Unbescheid, Johannes PDF

By Uwe Herrmann, Dierk Lenz, Gunter Unbescheid, Johannes Ahrends

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Das Format kann jedoch leicht auf eine vierstellige Jahreszahl geändert werden. Ebenso wichtig ist die Information, dass die Speicherung von Daten intern immer mit einer vierstelligen Jahreszahl erfolgt. 3 Zeichensätze In heterogenen Rechnerumgebungen wird mit einer Vielzahl von Zeichensätzen gearbeitet. B. für einen 8-Bit-Zeichensatz den 256 möglichen Werten Buchstaben, Ziffern, Sonderzeichen und Umlaute zugeordnet sind. 127 an die Vorgabe des ASCII-Zeichensatzes halten, Umlaute aber verschieden behandeln.

K. 2: Deadlock In der Praxis kommen Deadlocks eher dann vor, wenn sich Entwickler verschiedener Module einer Anwendung nicht darüber einig sind, in welcher Reihenfolge Datensätze grundsätzlich zu sperren sind, wenn sie aus verschiedenen Tabellen kommen. B. sollte bei Tabellen, die über einen Fremdschlüssel verknüpft sind, immer zuerst die Master-Tabelle, dann die Detail-Tabelle gesperrt werden. 3 Lesekonsistenz Als äußerst wichtige Eigenschaft der SQL-Verarbeitung in der Oracle-Datenbank gilt, dass lesende Befehle (SELECT) keinerlei DML-Sperren verursachen.

8: Szenario 2 Sandini Bib Zusammenspiel der Komponenten 51 Abschließend wird dann der LGWR gezwungen, die nun im Logpuffer vorhandenen Informationen in die aktuelle Redolog-Gruppe zu schreiben. B. auch nach einem Stromausfall wiederhergestellt werden können. Die zur Wiederherstellung benötigte Information muss demnach permanent auf Festplatte gespeichert sein. Erst wenn der LGWR vom Betriebssystem die Bestätigung bekommt, dass der Schreibvorgang durchgeführt ist, wird dem Client-Prozess die Ausführung der Aktion bestätigt.

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