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NEW QUESTION: 1
When building a predictive model, the use of testing and validation samples ______________.
A. is mandatory for segmentation
B. enables model validation in strategies
C. validates the quality of input data
D. increases the accuracy of models
Answer: C
Explanation:
Reference:
https://pegasystems2.https.internapcdn.net/pegasystems2/marketing/C-762-StudentGuide.pdf

NEW QUESTION: 2

A. Option B
B. Option C
C. Option D
D. Option A
Answer: B

NEW QUESTION: 3
Sie haben eine Standardinstallation von SQL Server, die eine OLTP-Anwendung (Online Transaction Processing) hostet.
Benutzer berichten, dass sie insgesamt eine schlechte Abfrageleistung für die Anwendung feststellen.
Sie fragen die Wartestatistik ab und stellen fest, dass die beiden häufigsten Wartestatus CXPACKET und SOS_SCHEDULER_YIELD sind.
Sie müssen die SQL Server-Einstellungen ändern, um das Problem zu beheben, das die schlechte Abfrageleistung verursacht.
Welche beiden Einstellungen sollten Sie ändern? Jede richtige Antwort ist Teil der Lösung.
A. Maximaler Parallelitätsgrad (MAXDOP)
B. Für Ad-hoc-Workloads optimieren
C. Kostenschwelle für Parallelität
D. Erhöht die SQL Server-Priorität
E. Mindestspeicher
Answer: A,C
Explanation:
Erläuterung
A: MAXDOP absenken.
Wenn hohe CXPACKET-Werte auftreten, ist ein mögliches Problem, auch wenn die Parallelität gleichmäßig verteilt ist, wenn die Kosten für die Erstellung des parallelen Plans höher sind als die Kosten für den serialisierten Thread. Dies wird häufig übersehen und als Faustregel gilt, nach einer Änderung des maximalen Parallelitätsgrads (MAXDOP) zu greifen, indem dieser auf 1 gesetzt wird (jede einzelne Abfrage wird vom einzelnen CPU-Kern verarbeitet).
Das Konfigurieren der MAXDOP-Einstellungen auf 1 sollte die letzte Ressource sein, die zur Behebung übermäßiger CXPACKET-Wartezeiten verwendet wird.
Wenn ein hoher CXPACKET-Wert mit einem LATCH_XX und mit PAGEIOLATCH_XX oder SOS_SCHEDULER_YIELD einhergeht, ist dies ein Indikator dafür, dass die langsame / ineffiziente Parallelität selbst die eigentliche Ursache für die Leistungsprobleme ist. Wenn in einem solchen Szenario LATCH_XX die Klasse ACCESS_METHODS_DATASET_PARENT oder ACCESS_METHODS_SCAN_RANGE_GENERATOR lautet, ist die Parallelität höchstwahrscheinlich der Engpass und die eigentliche Ursache für das Problem mit der Abfrageleistung. Dies ist ein typisches Beispiel, bei dem MAXDOP reduziert werden sollte.
E: Der CTFP-Wert (Cost Threshold for Parallelism) wird in Sekunden angegeben. Dies bedeutet, dass für jede Abfrage, für die SQL Server eine Laufzeit von mehr als 5 Sekunden veranschlagt, ein paralleler Plan erstellt wird.
Um unerwünschte Parallelität zu vermeiden, könnte die CTFP-Zahl erhöht werden und nach der oben genannten Faustregel ein Mindestwert von 25. Neuere Analysen zeigen, dass 50 die optimale Mindestzahl für moderne Computer sein sollte.
Referenzen: https://www.sqlshack.com/fehlersuche-des-cxpackets-warte-type-in-sql-server/