Identity the resource bottleneck for which QoS Management can generate recommendation?
A.
CPU resource bottlenecks
B.
Global Cache resource bottlenecks
C.
I/O resource bottlenecks
D.
Network resource bottlenecks
Explanation:
Note:
*Oracle Exadata QoS Management provides the following benefits:
• Reduces the time and expertise requirements for system administrators who manage Oracle
Real Application Clusters (Oracle RAC) resources
• Helps reduce the number of performance outages
• Reduces the time needed to resolve problems that limit or decrease the performance of your
applications
• Provides stability to the system as the workloads change
• Makes the addition or removal of servers transparent to applications
• Reduces the impact on the system caused by server failures
• Helps ensure that service-level agreements (SLAs) are met
• Enables more effective sharing of hardware resources
• Protects existing workloads from over committed memory-induced server failures
• Exadata Storage Virtualization
• Exadata provides a rich set of sophisticated and powerful storage management virtualization
capabilities that leverage the strengths of the Oracle Database, the Exadata software, and
Exadata hardware.
*When QoS Management is enabled, individual Exadata nodes are protected from
memory related failures. The Memory Guard features tracks real-time memory use
and should it detect a node has over-committed memory, will prevent new database
requests from being sent until the current load is relieved
A is correct answer.
B
a
Choosing the Best Recommendation
When trying to improve the performance of a particular Performance Class, Oracle Database QoS Management recommends adding more of the bottleneck resource (such as CPU time) for that Performance Class or making the bottleneck resource available more quickly to work requests in the Performance Class. The recommendations take the form of moving servers between server pools, promoting the target Performance Class to a higher Consumer Group, or demoting competing Performance Classes within the resource plan.
For example, one possible solution to resolving a bottleneck on the CPU resource is to demote the Consumer Group associated with the Performance Class that is using the CPU the most. By limiting access to the CPU for the work requests in this Performance Class, the work requests in the other Performances Classes for that database get a larger share of the CPU time. However, Oracle Database QoS Management might decide not to recommend this action because the gain in response time for the target Performance Class is too small.
I guess A is correct answer.
What types of resources does QoS Management manage?
Currently QoS Management manages CPU resources both within a database and between databases running on shared
or dedicated servers. It also monitors wait times for I/O, Global Cache, and Other database waits.
http://www.oracle.com/technetwork/database/exadata/faq-qosmanagement-511893.pdf
The correct answer is A.
Configuration Recommendations for Global Cache Resource Bottlenecks
A Global Cache resource bottleneck is detected when there is excessive data block movement between database instances. This is usually caused by an application that is not configured properly or is not able to scale horizontally. Configuring the application to run in a server pool with a maximum size of one or partitioning the data can usually relieve the bottleneck.
Oracle Database QoS Management cannot perform either of these actions in this release and does not provide a recommendation that can be implemented for this type of bottleneck.
Configuration Recommendations for I/O Resource Bottlenecks
An I/O resource bottleneck is detected when there are excessive wait times on the storage subsystem. This type of bottleneck is typically caused by either too few disk spindles or not enough network bandwidth on the storage interconnect. To resolve this bottleneck, spread the database files across a higher number of disks, or configure a separate network interface card (NIC) for a dedicated storage interconnect.
Oracle Database QoS Management cannot resolve this type of bottleneck in this release and does not provide a recommendation that can be implemented.
http://docs.oracle.com/database/121/APQOS/wlm_strats.htm#BABJDGHD
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A:
Types of Recommendations
Modifying the CPU Count
If you have multiple database instances running on servers in a server pool, Oracle Database QoS Management can recommend that CPU resources used by a database instance in one slice on the server be donated to a slice that needs more CPU resources. If there is a Performance Class that is not meeting its Performance Objective, and there is another slice on the system that has available headroom, or the Performance Classes that use that slice are of a lower rank, then Oracle Database QoS Management can recommend moving a CPU from the idle slice to the overloaded slice. If this recommendation is implemented, then the CPU_COUNT parameter is adjusted downwards for the idle instance and upwards for the overworked instance on all servers in the server pool.
https://docs.oracle.com/cd/E24693_01/server.11203/e24611/apqos_intro.htm#CHDDFCDA
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