Oracle Oracle Certifications 1Z0-468 Questions & Answers

• Question 11:

  Which plug-in does Oracle Traffic Director require you to install to load balance HTTP requests to WebLogic Server?

  A. mod_wls

  B. mod_weblogic

  C. mod_wl_ohs

  D. No plug_in is required

  E. mod_ohs_wl

  Correct Answer: C

• Question 12:

  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?

  A. 512 GB

  B. 1 GB

  C. 2 GB

  D. 4 GB

  Correct Answer: C

  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).

• Question 13:

  Which tool is not shipped with the JRockit JDK?

  A. Mission Control

  B. Flight Recorder

  C. Studio Profiler

  D. Memory Leak Detector

  Correct Answer: D

• Question 14:

  Consider an application using a Coherence partitioned cache to store HTTP session data. There is a load balancer that performs client based affinity (or "sticky load balancing"), meaning that requests that come from a particular user will be routed to the same application server every time. Most user requests will read from the session, thus making near caching topology a good fit.

  Which near cache configuration matches the requirements for this application?

  A. AUTO

  B. NONE

  C. ALL

  D. PRESENT

  Correct Answer: D

• Question 15:

  Which action do you take when deploying Oracle HTTP Server to ensure all client communications within OHS are confidential?

  A. Deploy OHS in A DMZ.

  B. Configure all OHS Listeners to use SSL.

  C. Nothing; all client communications are confidential.

  D. This configuration is not possible.

  E. Use a network firewall.

  Correct Answer: B

• Question 16:

  You notice the following message in one of your cache server logs:

  

  Which statement correctly explains this message?

  A. Member 102 received a MemberLeft message from the senior member (member 1) that member 74 has left the cluster.

  B. Member 1 received a MemberLeft message from the senior member (member 74) that member 102 has left the cluster.

  C. Member 1 received a MemberLeft message from the senior member (member 102) that member 74 has left the cluster.

  D. Member 74 received a MemberLeft message from the senior member (member 1) that member 102 has left the cluster.

  Correct Answer: A

• Question 17:

  What is the main method used to collect the monitoring data of a Coherence cluster, its nodes, and caches?

  A. Enterprise Manager agent on every host, querying JMX data from nodes running on that host

  B. one central Enterprise Manager agent, querying JMX data from each node in the cluster

  C. JVMD agent collecting data trough sampling of the JVM for each node

  D. Enterprise Manager agent on every host, querying JMX data from nodes running on the host, and a central Enterprise Manager agent querying JMX data from a management node for cluster-level

  E. one central Enterprise Manager agent querying JMX data from a single management node

  Correct Answer: D

  http://docs.oracle.com/cd/E29505_01/install.1111/e24215/coherence_getstarted.htm

• Question 18:

  When integrating a CacheStore with a database, which technique is correct for managing database connections?

  A. Use a connection pool provided by an application server, the JDBC driver, or a third party.

  B. Create a new connection every time a CacheStore method is invoked.

  C. Create a new connection in the CacheStore constructor and store a to it that can be accessed by the CacheStore methods.

  D. Configure Coherence to use its built-in capabilities to manage connections.

  Correct Answer: A

• Question 19:

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

  A. JDP enables network auto discovery of JVMs.

  B. JDP is a subset of HTTP.

  C. JDP can be used by application to exchange serialized data between JVMs.

  D. JDP was initially introduced in the HotSpot VM 1.5.

  Correct Answer: A

• Question 20:

  The performance of your query is very slow.

  Which two actions would you take to diagnose potential bottlenecks? (Choose two.)

  A. Check that indexes are registered against the fields being queried.

  B. Monitor the task execution time.

  C. Use the QueryRecorder to see the query Trace and Explain plan.

  D. Check that indexes are cached against the fields being queried.

  E. Monitor the task performance time.

  Correct Answer: BD