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NEW QUESTION: 1
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. Kostenschwelle für Parallelität
B. Für Ad-hoc-Workloads optimieren
C. Mindestspeicher
D. Maximaler Parallelitätsgrad (MAXDOP)
E. Erhöht die SQL Server-Priorität
Answer: A,D
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/
NEW QUESTION: 2
A. Option E
B. Option C
C. Option D
D. Option B
E. Option A
Answer: B,E
Explanation:
Explanation
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/ CLIConfigurationGuide/PrivateVLANs.html
NEW QUESTION: 3
You have a Remote Desktop Session Host (RD Session Host) server farm. All of the RD Session Host servers use Per Device licensing mode.
You have 100 Remote Desktop Services client access licenses (RDS CALs).
Your network contains 100 users. Each user has a desktop computer. Twenty client computers run Windows XP Professional Edition, 20 client computers run Windows Vista Professional, and 60 client computers run Windows 7 Enterprise.
All of the users use RemoteApps that are published in the RD Session Host farm.
You replace the Window XP client computers with new desktop computers that run Windows 7 Professional. You replace the Windows Vista client computers with new desktop computers that run Windows 7 Enterprise.
Your company hires 10 new employees. For each new employee, the company purchases a new laptop that run Windows Vista Ultimate.
You need to identify the total number of RDS CALs the company must purchase to ensure that all of the client computer are licensed to access the Remote Desktop servers. The solution must minimize costs.
How many RDS CALs should the company purchase?
A. 0
B. 1
C. 2
D. 3
Answer: C
Explanation:
Every device needs an RDS-CAL whatever operating system it's running. The company will end up with 110 computers so 10 additional CALs are required.
Ref: http://www.microsoft.com/en-us/server-cloud/windows-server/remote-desktopservices-buy.aspx
NEW QUESTION: 4
A. Projects panel
B. Visual Design
C. Interactive mode
D. Assets panel
Answer: B,C
Explanation:
Explanation
References:
http://www.daoudisamir.com/references/vs_ebooks/html5_css3.pdf
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