Question # 1
Which two tasks can be performed when WLST is in OFFLINE mode?
| | A. modifying the configuration of an online domain
| | B. modifying the configuration of an offline domain
| | C. viewing runtime performance data in ONLINE mode
| | D. viewing runtime performance data in OFFLINE mode
| | E. creating and extending domains |
B. modifying the configuration of an offline domain
E. creating and extending domains
WLST enables you to create a new domain or update an existing domain
without connecting to a running WebLogic Server (that is, using WLST offline)—supporting
the same functionality as the Configuration Wizard.
E: With WLST you can
Creating a Domain (Offline)
Updating an Existing Domain (Offline)
Creating a Domain Template (Offline)
Exporting Diagnostic Data (Offline)
Stepping Through a Sample Script: Creating a Domain Using WLST Offline
Reference: Creating and Configuring WebLogic Domains Using WLST Offline
Question # 2
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?
| | A. Run WebLogic in a JRockit JVM and ensure the Flight Recorder is enabled.
| | B. Configure the WebLogic Diagnostic Framework Event Volume to Low, Medium, or High
depending on the type of events you want to capture.
| | C. Configure the WebLogic Diagnostic Framework bridge to send events to the JRockit
Flight Recording.
| | D. Take a dump from the default recording or create a new recording for the time period
you want to capture. |
A. Run WebLogic in a JRockit JVM and ensure the Flight Recorder is enabled.
B. Configure the WebLogic Diagnostic Framework Event Volume to Low, Medium, or High
depending on the type of events you want to capture.
D. Take a dump from the default recording or create a new recording for the time period
you want to capture.
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("Servers/myserver")
cd("ServerDiagnosticConfig")
cd("myserver")
cmo.setWLDFDiagnosticVolume("Medium")
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. Oracle Fusion Middleware Performance and Tuning for Oracle WebLogic
Server, Tuning WebLogic Diagnostic Framework and JRockit Flight Recorder Integration
Reference: JRockit Flight Recorder & WebLogic Diagnostic FrameWork (WLDF)
Integration
Question # 3
Which statement is FALSE regarding WebLogic Server 12c?
| | A. supports Java EE 6.0
| | B. supports WebLogic Web Services 8.1 Application Environment
| | C. includes a new Maven plug-in
| | D. supports use of annotations in resource adapter class files |
B. supports WebLogic Web Services 8.1 Application Environment
Incorrect:
Not A: New or enhanced WebLogic 12c features include
JAVA EE 6 support all kinds of JEE6 specifications
Not C: 12c do include a new Maven plug-in
Not D: For 1.6 adapters, you can embed metadata annotations in the resource adapter
class files to specify deployment information, eliminating the need to create the ra.xml file
manually.
Question # 4
A customer needs to ensure that the number of threads servicing an application does not
exceed the number of database connections available to the application.
What step must you take to address this situation? | | A. Configure a Max Threads Constraint and add your application to the list of applications
for the Constraint.
| | B. Configure a Work Manager with a Maximum Threads Constraint tied to the Connection
Pool and configuration your application to use the Work Manager.
| | C. Configure a Work Manager with a Minimum Threads Constraint tied to the Connection
Pool and configure your application to use the Work Manager.
| | D. Configure a global MaxThreads constraint and target it to the server or clusters where
your application is deployed.
| | E. Configure the startup parameter "-Dwls-maxThreads" to be the same as the number of
database connections configured. |
B. Configure a Work Manager with a Maximum Threads Constraint tied to the Connection
Pool and configuration your application to use the Work Manager.
To manage work in your applications, you define one or more of the following
Work Manager components:
Fair Share Request Class:
Response Time Request Class:
Min Threads Constraint:
Max Threads Constraint:
Capacity Constraint
Context Request Class:
Note:
* max-threads-constraint—This constraint limits the number of concurrent threads
executing requests from the constrained work set. The default is unlimited. For example,
consider a constraint defined with maximum threads of 10 and shared by 3 entry points.
The scheduling logic ensures that not more than 10 threads are executing requests from
the three entry points combined.
A max-threads-constraint can be defined in terms of a the availability of resource that
requests depend upon, such as a connection pool.
A max-threads-constraint might, but does not necessarily, prevent a request class from
taking its fair share of threads or meeting its response time goal. Once the constraint is
reached the server does not schedule requests of this type until the number of concurrent
executions falls below the limit. The server then schedules work based on the fair share or
response time goal.
* WebLogic Server prioritizes work and allocates threads based on an execution model that
takes into account administrator-defined parameters and actual run-time performance and
throughput
Administrators can configure a set of scheduling guidelines and associate them with one or
more applications, or with particular application components.
* WebLogic Server uses a single thread pool, in which all types of work are executed.
WebLogic Server prioritizes work based on rules you define, and run-time metrics,
including the actual time it takes to execute a request and the rate at which requests are
entering and leaving the pool.
The common thread pool changes its size automatically to maximize throughput. The
queue monitors throughput over time and based on history, determines whether to adjust
the thread count. For example, if historical throughput statistics indicate that a higher
thread count increased throughput, WebLogic increases the thread count. Similarly, if
statistics indicate that fewer threads did not reduce throughput, WebLogic decreases the
thread count. This new strategy makes it easier for administrators to allocate processing
resources and manage performance, avoiding the effort and complexity involved in
configuring, monitoring, and tuning custom executes queues.
Reference: Using Work Managers to Optimize Scheduled Work
Question # 5
Which action cannot be done in a scripted, automated fashion using WLST?
| | A. collecting run-time metrics and sending an email if user-defined thresholds are
exceeded
| | B. configuring Clusters and Managed Servers
| | C. starting Managed Servers using the Node Manager
| | D. installing WebLogic binaries on a remote machine using Node Manager
| | E. configuring a Managed Server on a remote machine where the Node Manager is
installed but no other Managed Servers from the domain exist |
D. installing WebLogic binaries on a remote machine using Node Manager
http://docs.oracle.com/middleware/1212/wls/WLSTG/domains.htm
Question # 6
In a Java EE messaging application, one MDB is consuming a lot of memory at high traffic.
What configuration should you use to prevent possible out-of-memory error at high traffic
and at the same time not losing messages?
| | A. Configure a Work Manager for the MDB with a Maximum Thread Constraint.
| | B. Configure a Work Manager for the MDB with a Minimum Thread Constraint.
| | C. Configure a Work Manager for the MDB with a Maximum Thread Constraint and a
Capacity Constraint.
| | D. Configure a Work Manager for the MDB with a Minimum Thread Constraint and a
Capacity Constraint.
| | E. Configure a Work Manager for the MDB with both a Maximum Thread Constraint and
Minimum Thread Constraint. |
B. Configure a Work Manager for the MDB with a Minimum Thread Constraint.
* When to Use Work Managers
Following are guildelines to help you determine when you might want to use Work
Managers to customize thread management:
/ The default fair share is not sufficient.
This usually ocurrs in situations where one application needs to be given higher priority
over another.
/ A response time goal is required.
/ A minimum thread constraint needs to be specified to avoid server deadlock
Question # 7
Integration between _______ multidata sources and _____ is defined as the Grid Link for
RAC.
| | A. Oracle WebLogic Server; Oracle Database
| | B. Oracle WebLogic Server clusters; Oracle Database
| | C. Oracle WebLogic Server clusters; Oracle Database RAC
| | D. Oracle OC4J; Oracle Database RAC
| | E. Oracle WebLogic Server; Oracle OC4J |
C. Oracle WebLogic Server clusters; Oracle Database RAC
The WebLogic Server JDBC subsystem has supported Oracle RAC since
WLS
version 8.1 SP5, originally developed for Oracle9i RAC. This support is based on a
particular type of data source configuration, called a multi data source. A multi data
source is a data source abstraction over one or more individual data sources. It
serves JDBC connections from each of the member data sources according to a
specified policy2. A RAC multi data source configuration requires that each
member data source obtain connections to a particular RAC instance, as illustrated
in the following diagram of a three-node RAC cluster configuration.
Reference: Oracle WebLogic Server Active GridLink for Oracle Real Application
Clusters(RAC)
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