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Oracle WebLogic Server 12c Essentials

Question No: 31

Which option must you choose to configure Node Manager on a machine (server or zone)?

  1. Configure one Node Manager per domain (for example, if there are two domains on one machine, then you will need to configure two Node Managers).

  2. Configure one Node Manager per machine with any number of WebLogic instances running on it.

  3. Configure one Node Manager per machine for all WebLogic, OHS, and OEM running on the same machine.

  4. Configure one Node Manager for every WebLogic instance.

  5. Configure two or more Node Managers for every WebLogic instance.

Answer: B

Explanation: A Node Manager process is not associated with a specific WebLogic domain but with a

machine. You can use the same Node Manager process to control server instances in

any WebLogic Server domain, as long as the server instances reside on the same machine as the Node Manager process. Node Manager must run on each computer that hosts WebLogic Server instances-whether Administration Server or Managed Server-that you want to control with Node Manager.

Reference: Overview of WebLogic Server Domains

Question No: 32

What are four benefits of recommended basic architecture?

  1. Good load balancing between Presentation Tier and Object Tier

  2. Easy administration

  3. Flexible Load balancing

  4. Optimal performance

  5. Simple security

Answer: B,C,D,E

Question No: 33

You are configuring a JMS server with a need for load balancing the messages. To achieve the load balance you should and .

  1. use regular queues and topics

  2. use distributed queues and topics

  3. not use subdeployments

  4. disable server affinity

  5. use message paging

Answer: B,C

Explanation: Load Balancing for JMS

WebLogic Server JMS supports server affinity for distributed JMS destinations and client connections. (B, not A)

By default, a WebLogic Server cluster uses the round-robin method to load balance objects. To use a load balancing algorithm that provides server affinity for JMS objects (not D), you must configure the desired method for the cluster as a whole.

Reference: Using Clusters for Oracle WebLogic Server 12c , Load Balancing for JMS

Question No: 34

To use Active Cache features in WebLogic 12C, which three libraries are needed from the WebLogic Server installation to be deployed in WebLogic Server?

  1. coherence-work.jar

  2. coherence.jar

  3. active-cache-1.0.jar

  4. coherence-web-spi.war

Answer: B,C,D Explanation:

B, D: In addition to the coherence.jar file, Coherence provides a deployable shared library, coherence-web-spi.war, that contains a native plug-in to WebLogic Server#39;s HTTP Session Management interface. Coherence also provides the active-cache-1.0.jar file which contains the classes that allow WebLogic Server to interact with Coherence.

C: The active-cache-1.0.jar is included in the WebLogic Server installation. Reference: Oracle Coherence Tutorial for Oracle Coherence

Question No: 35

You want to capture WebLogic internal events correlated with JVM events for viewing offline. What three actions must you take to enable this within WebLogic?

  1. Run WebLogic in a JRockit JVM and ensure the Flight Recorder is enabled.

  2. Configure the WebLogic Diagnostic Framework Event Volume to Low, Medium, or High depending on the type of events you want to capture.

  3. Configure the WebLogic Diagnostic Framework bridge to send events to the JRockit Flight Recording.

  4. Take a dump from the default recording or create a new recording for the time period you want to capture.

Answer: A,B,D

Explanation: A: You can enable JFR at runtime to take JRA recordings from the JRockit Management Console. You also have the option of turning off the JFR and recordings at the JRockit JVM level from the java command line using:

$ java -XX:-FlightRecorder B:

  • In most environments, there is little performance impact when the Diagnostic Volume is set to Low and the most performance impact if Diagnostic Volume is set to High. The volume of diagnostic data produced by WebLogic Server needs to be weighed against potential performance loss.

  • WLDF provides the Diagnostic Volume attribute to set the amount of code coverage that is enabled and the amount of data provided in the events that are generated for the covered code

    The following code example sets the volume to Medium:

    connect() edit() startEdit()

    cd(quot;Servers/myserverquot;) cd(quot;ServerDiagnosticConfigquot;) cd(quot;myserverquot;) cmo.setWLDFDiagnosticVolume(quot;Mediumquot;) save()

    activate()

    D: Integrated with the WebLogic Diagnostic Image and Watch and Notification system

    • Enables capture based on system state, event – capture during event; no need to replicate

    • Watch for stuck thread count, heap size increase, available memory, etc.

    • Set up notifications: capture WLDF image

    • Diagnostic image capture spurs JFR file generation; JFR file included in diagnostic image

    • Includes full JFR data from all event generators

    Note:

  • WebLogic Diagnostic Framework (WLDF) provides specific integration points with JRockit Mission Control Flight Recorder. WebLogic Server events are propagated to the Flight Recorder for inclusion in a common data set for runtime or post-incident analysis.

Reference: Oracle Fusion Middleware Performance and Tuning for Oracle WebLogic Server, Tuning WebLogic Diagnostic Framework and JRockit Flight Recorder Integration

Reference: JRockit Flight Recorder amp; WebLogic Diagnostic FrameWork (WLDF) Integration

Question No: 36

Which two outcomes result when a domain is created in development mode?

  1. WebLogic server starts automatically upon the restarting of the machine

  2. each new cluster will automatically be created with two managed servers

  3. boot.properties file automatically stored

  4. creation of an auto deploy folder used for the application to deploy automatically

  5. Node Manager will be automatically configured

Answer: C,D

Explanation: C: The saviour of having to type in the username and password each and every time that you start a server. A very useful little file to have, particularly if you have multiple managed servers.

By default, this appears in the Admin Servers security directory ($DOMAIN_HOME/servers/AdminServer/security) when a domain is created in development mode and is called boot.properties. The file is only created for the admin server, not for any additional servers; simply copying the security directory over is enough. The password is encrypted for the domain, so it can only be used for servers within that domain.

In production mode, the boot.properties file doesn’t exist.

D: Development mode enables a WebLogic Server instance to automatically deploy and update applications that are in the domain_name/autodeploy directory (where domain_name is the name of a WebLogic Server domain). Production mode disables the auto-deployment feature and prevents any applications you place in the autodeploy directory after you switch to production mode from being deployed.

Note:

  • By default, a WebLogic Server domain runs in development mode.

  • You can run a WebLogic Server domain in two different modes: development and production. Only development mode allows you use the auto-deployment feature

    Question No: 37

    Which action cannot be done in a scripted, automated fashion using WLST?

    1. collecting run-time metrics and sending an email if user-defined thresholds are exceeded

    2. configuring Clusters and Managed Servers

    3. starting Managed Servers using the Node Manager

    4. installing WebLogic binaries on a remote machine using Node Manager

    5. configuring a Managed Server on a remote machine where the Node Manager is installed but no other Managed Servers from the domain exist

    Answer: D

    Explanation: http://docs.oracle.com/middleware/1212/wls/WLSTG/domains.htm

    Question No: 38

    In the absence of shared storage between cluster nodes, which two actions can you take to configure a High Availability architecture?

    1. Move domain logs to a highly available database.

    2. Move server logs to a highly available database.

    3. Move transaction logs to a highly available database.

    4. Move JMS persistent stores to a highly available database.

    5. Move error logs to a highly available database.

    Answer: C,D

    Question No: 39

    You want to create a WebLogic domain in a production environment. Which three actions should you perform?

    1. Use a multinode WebLogic domain.

    2. Use a single-node WebLogic domain.

    3. Use clusters.

    4. Refrain from using clusters.

    5. Install WeLogic in production mode with CA signed certificates.

    Answer: A,C,E

    Explanation: Use multi-node and clustering to get performance suitable for a product environment.

    Question No: 40

    Identify three advantages of Active GridLink for RAC over multidata source.

    1. isolates WebLogic from RAC changes

    2. has a simple configuration

    3. enables statement caching

    4. performs faster failure detection and failover

    5. is supported in WebLogic Domain Templates

    Answer: A,B,D

    Explanation: A, B: With Active GridLink for RAC, WebLogic instances are isolated from

    RAC configuration changes, and DBAs only need to contend with a single data source rather than multiple data sources.

    D: Active GridLink for RAC distributes work based on different backend node capacities, automatically detecting and adapting to overworked nodes and hangs. It enables smart load balancing across RAC nodes. This makes it easier to route traffic around node failures, enhancing availability and performance.

    Reference: Introducing WebLogic Server 12c

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