1z0-468: Oracle Cloud Application Foundation Essentials

What three components are not part of EM and require separate installations? (Choose two.)

BTM Engine
RUEI Engine
JVM Diagnostics Engine
Application Discovery and Performance Management Engine
Ops Center

Correct answer: DE

Explanation:

Reference: http://docs.oracle.com/cd/E24628_01/doc.121/e25353/overview.htm#EMCON109

What is the difference between Entry Processors and Aggregators?

Entry Processors require a key or a set of keys, whereas Aggregators require filters.
Entry Processors can skip the network by executing against near caches directly, whereas Aggregators must execute on storage members.
Entry Processors are better suited to Map-Reduce operations than Aggregators.
Aggregators are optimized for read-only access, whereas Entry Processors can modify cache entries.

Correct answer: D

Explanation:

Reference: https://www.c2b2.co.uk/middleware-blog/do-coherence-aggregators-failover.php

Which statement about JRockit Discovery Protocol (JDP) is true?

JDP enables network auto discovery of JVMs.
JDP is a subset of HTTP.
JDP can be used by application to exchange serialized data between JVMs.
JDP was initially introduced in the HotSpot VM 1.5.

Correct answer: A

Explanation:

Reference: https://books.google.com.pk/books?id=Wyu4XHQQeFwC&pg=PT418&lpg=PT418&dq=Jrootkit+discovery+protocol+enables+network+auto+discovery+of+JVMs&source=bl&ots=fwYlTNHe_J&sig=uiQ691dg60y4N7wPLhZu01oBr60&hl=en&sa=X&redir_esc=y#v=onepage&q=Jrootkit%20discovery%20protocol%20enables%20network%20auto%20discovery%20of%20JVMs&f=false

How would you create an SLA based on the “JVM Runtime Up” metric for a specific WLS server?

Deploy JVM Diagnostics and set a threshold on the JVMD agent up time.
Create a Service target that uses the WLS Domain as its system, and the JVM Runtime as its performance metric. Configure SLA by using that metric.
Define a threshold on the metric on the All Metrics page, and define a rule to create an Event for that incident. Define an SLA on the count of Incidents.
You cannot create an SLA on JVM-related metrics.

Correct answer: C

Your application will store data in two partitioned caches, each configured for one backup. You have calculated the total amount of data to be 10 GB for the first cache, and 3 GB for the second cache. You plan to run 10 cache servers in total.

What is the minimum recommended JVM heap size for each cache server?

512 GB
1 GB
2 GB
4 GB

Correct answer: C

Explanation:

When considering heap size, it is important to find the right balance. The lower bound is determined by per-JVM overhead (and also, manageability of a potentially large number of JVMs). For example, if there is a fixed overhead of 100MB for infrastructure software (for example, JMX agents, connection pools, internal JVM structures), then the use of JVMs with 256MB heap sizes results in close to 40% overhead for non-cache data. The upper bound on JVM heap size is governed by memory management overhead, specifically the maximum duration of GC pauses and the percentage of CPU allocated to GC (and other memory management tasks). Reference: https://docs.oracle.com/middleware/1212/coherence/COHAG/tune_perftune.htm#COHAG217

When considering heap size, it is important to find the right balance. The lower bound is determined by per-JVM overhead (and also, manageability of a potentially large number of JVMs). For example, if there is a fixed overhead of 100MB for infrastructure software (for example, JMX agents, connection pools, internal JVM structures), then the use of JVMs with 256MB heap sizes results in close to 40% overhead for non-cache data. The upper bound on JVM heap size is governed by memory management overhead, specifically the maximum duration of GC pauses and the percentage of CPU allocated to GC (and other memory management tasks).

Reference: https://docs.oracle.com/middleware/1212/coherence/COHAG/tune_perftune.htm#COHAG217

Which type of appliance would you use to package custom applications into an appliance?

WebLogic Server appliance
external appliance
generic appliance
database appliance
Oracle Tuxedo appliance

Correct answer: A

Explanation:

Reference: http://www.oracle.com/us/products/middleware/application-server/wls-virtualization-bwp-067889.pdf

Which statement describes the difference between the Runtime Analyzer and JRockit Flight Recorder?

Only Runtime Analyzer allows detailed heap analysis.
Only Flight Recorder allows “back-in-time” analysis.
Thread deadlock analysis is not possible in Flight Recorder.
Flight Recorder cannot be run in an "always-on" mode.
Flight Recorder causes significantly higher processor overhead than Runtime Analyzer.

Correct answer: B

Explanation:

Reference: https://docs.oracle.com/cd/E15289_01/doc.40/e15070/introduction.htm

When an object placed into a cache implements the Java Runnable interface, Coherence will _______________.

immediately schedule it to be an on the service thread of the cache in which it was placed
do nothing; Coherence does not differentiate between types of value objects
ultimately attempt to run the object on a free worker thread associated with the service of the cache in which the object was placed
hand the object over to the Invocation service to invoke the run method

Correct answer: A

What is the primary purpose of the Middleware Diagnostics Advisor (MDA) included in WLS Management Pack EE?

to automate the SQL tuning process by comprehensively exploring all the possible ways of tuning a SQL statement
to facilitate proactive performance and availability management by auto-finding problems and suggesting solutions
to find configuration problems by comparing WLS configuration to a Gold Image configuration
to provide comprehensive advice on how to optimize schema design in order to maximize application performance
to analyze the EM configuration and suggest configuration changes that will extend the stability of EM

Correct answer: B

Explanation:

Reduce problem resolution time through middleware diagnostics advisor which provides “root cause” findings in context of the most relevant configuration parameters and offers suggestions for each finding. Reference: http://www.oracle.com/technetwork/oem/soa-mgmt/ds-em12c-wls-mgmt-pack-ee-1552456.pdf

Reduce problem resolution time through middleware diagnostics advisor which provides “root cause” findings in context of the most relevant configuration parameters and offers suggestions for each finding.

Reference: http://www.oracle.com/technetwork/oem/soa-mgmt/ds-em12c-wls-mgmt-pack-ee-1552456.pdf

Which change cannot be made in an assembly at deployment time?

setting the appliance’s memory and CPU requirements
changing the listening port of the product
not deploying an appliance by setting its target count to zero
not deploying an appliance by removing it from the assembly

Correct answer: A

Vendor:	Oracle
Exam Code:	1z0-468
Exam Name:	Oracle Cloud Application Foundation Essentials
Date:	Apr 16, 2019
File Size:	255 KB

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