Renew 1z0-468 Preparation Exams 2021

NEW QUESTION 1
Which two JVM components can be configured to impact application performance? (Choose two.)

• A. Heap
• B. Local variables stack
• C. Class loader
• D. Bytecode interpreter
• E. Garbage Collector

Answer: CE

NEW QUESTION 2
Which two mechanisms are explicitly monitored to determine death of a cluster member? (Choose two.)

• A. garbage collection
• B. stuck threads
• C. heartbeats
• D. TCP socket connections

Answer: CD

Explanation:

Death detection works by creating a ring of TCP connections between all cluster members. TCP communication is sent on the same port that is used for cluster UDP communication. Each cluster member issues a unicast heartbeat, and the most senior cluster member issues the cluster heartbeat, which is a broadcast message. Each cluster member uses the TCP connection to detectthe death of another node within the heartbeat interval. Death detection is enabled by default and is configured within the <tcp-ring-listener> element.
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NEW QUESTION 3
With which three tasks can JRockit Diagnostic Commands (JRCMD) be used? (Choose three.)

• A. load testing
• B. heap analysis
• C. native memory tracking
• D. controlling JRockit Flight Recorder
• E. debugging with breakpoints

Answer: BCD

Explanation:
https://sourcevirtues.com/2012/06/21/jrockit-jrcmd-useful-commands/

NEW QUESTION 4
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.

Answer: A

NEW QUESTION 5
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

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).
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NEW QUESTION 6
You are using Coherence to store state data that gets read frequently and updated only occasionally. Only 100 or so clients are logged in at any time, and state data is retrieved at login. You are running out of physical memory on the cache server tier, but CPU and network utilization is low. You have 100 GB Solid-State Drives on every system, including clients. You would also like to provide faster access to state data for logged-in users.
Which configuration should you use for your system?

• A. Configure Elastic Data on your clients with a near cache.
• B. Configure a near cache on your client and a RAM Journal on your cache servers.
• C. Configure a near cache on your client and a Flash Journal on your cache servers.
• D. Because near caching does not work with Elastic Data, configure a near cache and an eviction policy on the cache servers.

Answer: C

NEW QUESTION 7
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

Answer: D

NEW QUESTION 8
What is the primary purpose of the Middleware Diagnostics Advisor (MDA) included in WLS Management Pack EE?

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

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.
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NEW QUESTION 9
What three actions can you perform while using Oracle Virtual Assembly Builder (Studio and/or Deployer)? (Choose three.)

• A. Create deployment plans.
• B. Create appliances and assemblies.
• C. Build and package.
• D. Transfer and deploy via Deployer.
• E. Back up and restore.

Answer: ABD

NEW QUESTION 10
Which configuration file must a user edit to configure Oracle HTTP Server?

• A. httpd.conf
• B. obj.conf
• C. workers.properties
• D. magnus.conf
• E. oraclehttp.conf

Answer: A

NEW QUESTION 11
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.

Answer: A

NEW QUESTION 12
Which three generational spaces make up the HotStop heap? (Choose three.)

• A. Young Generation
• B. Internal Generation
• C. Old Generation
• D. Permanent Generation
• E. Persistent Generation

Answer: ACD

NEW QUESTION 13
You have developed and tested your Coherence application on a single physical machine by using the following operational configuration:

What two configuration changes must be made to run your application on multiple physical machines using multicast? (Choose two.)

• A. Lower the logging severity level to 3.
• B. Change the unicast listener address to a non-loopback address.
• C. Increase the multicast listener time-to-live value.
• D. Specify a list of well-known addresses.

Answer: BD

Explanation:
https://docs.oracle.com/middleware/1212/coherence/COHAG/deploy_checklist.htm#COHA G5301

NEW QUESTION 14
What agent is used to collect the WLS server metrics that are available on the WLS All Metrics page?

• A. ADP Agent
• B. JVM Diagnostics Agent
• C. BTM Agent
• D. EM Agent
• E. JVMD Agent

Answer: B

NEW QUESTION 15
What is the correct order of API calls to perform an end-to-end assembly deployment operation?

• A. UploadAssemblyArchive -> RegisterAssemblyArchive -> CreateAssemblyInstance -> DeployAssemblyInstance -> UndeployAssemblyInstance -> DeleteAssemblyInstance -> UnregisterAssemblyArchive -> DeleteAssemblyArchive
• B. CreateAssemblyInstance -> UploadAssemblyArchive -> RegisterAssemblyArchive -> DeployAssemblyInstance -> UndeployAssemblyInstance -> UnregisterAssemblyArchive -> DeleteAssemblyArchive -> DeleteAssemblyInstance
• C. UploadAssemblyArchive -> RegisterAssemblyArchive -> DeployAssemblyInstance -> UndeployAssemblyInstance -> UnregisterAssemblyArchive -> DeleteAssemblyArchive
• D. RegisterAssemblyArchive -> UploadAssemblyArchive -> DeployAssemblyInstance -> UndeployAssemblyInstance -> DeleteAssemblyArchive -> UnregisterAssemblyArchive

Answer: B

NEW QUESTION 16
After going through a sizing exercise, you determine that your application will need 100 storage-enabled JVMs with 4 GB heaps. You have 10 physical machines with 16 cores and 32 GB of RAM.
Which performance-tuning best practice would be violated by deploying your application on these machines?

• A. Heap sizes should not be larger than 512 MB.
• B. OS socket buffers should be at least 2 MB.
• C. Avoid OS memory swapping/paging by not exhausting physical RAM.
• D. Do not exceed one JVM per core.

Answer: B

NEW QUESTION 17
What are the three business drivers for cloud computing? (Choose three.)

• A. better resource utilization
• B. enterprise agility
• C. higher customer support quality
• D. ease of administration
• E. elastic scalability

Answer: ADE

NEW QUESTION 18
HOTSPOT
Which two statements are true about the HotSpot Concurrent Garbage Collector? (Choose two.)
MISSING

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
MISSING

NEW QUESTION 19
What three components are not part of EM and require separate installations? (Choose two.)

• A. BTM Engine
• B. RUEI Engine
• C. JVM Diagnostics Engine
• D. Application Discovery and Performance Management Engine
• E. Ops Center

Answer: DE

NEW QUESTION 20
An application frequently requests data (from s Coherence cache configured with a cache loader) that may not be available in the underlying data source. The cost of looking up data via the cache loader is expensive in terms of time and resources.
To reduce these costs, which configuration should be used to cache the notion that an entry is not available?

• A. Modify the application to maintain a “misses” cache to keep track of the entries that were expected to be found in the other cache, but were recently not found.
• B. Configure a “cache-miss-scheme” on the appropriate cache.
• C. Modify the cache loader to maintain a “map” of entries not found, and consult this map before attempting to load an entry from the external source.
• D. This can't be achieved with Coherence.

Answer: A

NEW QUESTION 21
Which two statements are true about minor or young garbage collections? (Choose two.)

• A. Minor garbage collection is triggered when the eden space is full.
• B. Minor garbage collection does not cause a stop the world operation.
• C. Permanent generation is included in minor garbage collection.
• D. Minor garbage collections are usually shorter, with minimal impact on performance.
• E. Minor garbage collection does not occur when using a parallel collector.

Answer: AB

NEW QUESTION 22
What is the difference between Entry Processors and Aggregators?

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

Answer: D

NEW QUESTION 23
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