Oracle 1z0-468 Free Practice Questions

NEW QUESTION 1
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.
s:

NEW QUESTION 2
Which configuration can be used for enabling Coherence as an L2 Cache?

• A. @Entity@CacheInterceptor (CoherenceReadCustomizer.class)public class Employee implements Serializable
• B. @Entity@Customizer(CoherenceReadCustomizer.class)public class Employee implements Serializable
• C. @Entity@Customizer(CoherenceReadWriteCustomizer.class)public class Employee implements Serializable
• D. @Entity@CacheInterceptor (CoherenceInterceptor.class)public class Employee implements Serializable

Answer: D

NEW QUESTION 3
What three components of WLS can be managed by the WLS Management Pack EE?

• A. Applications Deployments
• B. SOA Composites
• C. WLS Domains
• D. WLS Managed Servers
• E. Oracle ESB

Answer: ABC

NEW QUESTION 4
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 5
Which Java command would list all the running Java applications on a system?

• A. jpsm -m
• B. jlist -m
• C. jproc -m
• D. jplist -m
• E. jps -m

Answer: E

NEW QUESTION 6
What three operations can an EM_PROVISIONONG_DESIGNER perform that an EM_PROVISIONONG_OPERATOR cannot? (Choose three.)

• A. Create profiles, components, and directives in the Software Library.
• B. Access provisioning profiles in the Software Library.
• C. Customize the default deployment procedure.
• D. Create deployment procedure templates.
• E. There is no difference in the type of operations that these two users can perform.

Answer: ACD

NEW QUESTION 7
Which two actions can be used to create/add an index in Coherence? (Choose two.)

• A. ValueExtractor
• B. Comparator
• C. QueryMap
• D. MapIndex
• E. SimpleMapIndex

Answer: AC

NEW QUESTION 8
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 9
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 10
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 11
Consider the following code:

If the initial stock amount was 15, and 5 different clients (in different JVMs) attempted to execute the same code simultaneously, what would be the resulting level of stock?

• A. 20, because Coherence does implicit locking
• B. 15, because a concurrency control exception will be thrown
• C. 16, because of the lack of concurrency control
• D. undefined, because of the lack of concurrency control

Answer: C

NEW QUESTION 12
Which statement describes the difference between the Runtime Analyzer and JRockit Flight Recorder?

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

Answer: B

NEW QUESTION 13
Your customer is a financial services company that uses a large compute grid (not Coherence) to do risk calculations. Objects representing risk scenarios are cached in Coherence. When these objects are updated, they are sent to the compute grid to recalculate risk via a continuous query cache. Assume that there are 100 compute servers in one data center and 100 GB of cached data. The customer is not worried about potential cluster instability, given their network design.
Which solution supports the customer’s requirements? Keep in mind licensing costs and features by edition.

• A. Coherence Standard Editio
• B. Nothing special is needed and Standard Edition is the low- cost option.
• C. Coherence Enterprise Edition, with the compute grid clients being storage-disabled cluster members.
• D. Coherence Grid Edition, with the compute grid clients being storage-disabled Coherence cluster members.
• E. Coherence Enterprise Edition, with the compute grid running against a set of Coherence*Extend proxies and continuous query cache on Coherence*Extend clients.

Answer: A

NEW QUESTION 14
Which change cannot be made in an assembly at deployment time?

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

Answer: A

NEW QUESTION 15
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 16
A Coherence node dies and is removed from a cluster.
What two actions occur if that node was part of a distributed cache where backup_count = 1? (Choose two.)

• A. Access is blocked to all operations while the cluster is rebalanced.
• B. Data is re-partitioned so that all data is accessible again.
• C. Partitions are moved so that the data is balanced among remaining nodes.
• D. Backup partitions are promoted to be primary, and new backups are created.

Answer: AC

NEW QUESTION 17
For operations that act on data that exists on multiple nodes, Coherence can do the processing in parallel, and put together the partial results from each node into a single result before sending it to the client.
Which feature in Coherence can be used to achieve this?

• A. Filters
• B. aggregators
• C. Indexes
• D. Entry Processors

Answer: B

NEW QUESTION 18
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 19
In which three scenarios would you use JRockit Mission Control? (Choose three.)

• A. finding hot methods
• B. static mode analysis
• C. tracking latencies
• D. heap analysis
• E. debugging with breakpoints

Answer: ACD

NEW QUESTION 20
Which is a valid reason for using Coherence Elastic Data?

• A. You want to cache more that the total amount of RAM on your systems.
• B. You want to extend your cluster across a WAN.
• C. Data must be persisted to disk to ensure fault tolerance.
• D. You want to store data on very large heaps.

Answer: A

Explanation:
http://www.oracle.com/technetwork/tutorials/tutorials-1694910.pdf

NEW QUESTION 21
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