Oracle Oracle Certifications 1Z0-599 Questions & Answers

• Question 71:

  Which feature is enabled when you start a WebLogic server with the DserverType=wlx option?

  A. JDBC

  B. JCA

  C. JMS

  D. EJB

  E. Java EE

  Correct Answer: A

  -DserverType={"wls" | "wlx"}

  Specifies the Server Type, which determines the set of services that are started in the server runtime.

  The default is "wls", which starts all WebLogic Server services, including EJB, JMS, Connector, Clustering, Deployment, and Management.

  The "wlx" option starts a server instance that excludes the following services, making for a lighter weight runtime footprint:

  *

  (not D) Enterprise JavaBeans (EJB)

  *

  (not B, not E) Java EE Connecter Architecture (JCA)

  *

  (not C) Java Message Service (JMS)

  Reference: Oracle Fusion Middleware Command Reference for Oracle WebLogic Server , Options for Configuring Deployment Attributes

• Question 72:

  Identify three unique integration features of Spring and WebLogic Server.

  A. ability to automatically convert Spring application to JavaEE 6 framework

  B. ability to export the WebLogic Container feature to another Spring enabled JavaEE server.

  C. ability to extend the WebLogic Server console with some Spring-related pages

  D. official support of Spring apps inside WebLogic by Oracle Support

  E. support for injection of WebLogic MBeans and Resources into Spring applications

  Correct Answer: CDE

  C: Spring Console Extension. WebLogic provides an Admin Console extension for Spring to provide administrators with visual tools for monitoring the Spring parts of deployed applications (first navigate to WebLogic Admin Console's Preferences | Extension menu option and and enable spring-console). This Spring console extension is basically a set of pages which are added amongst the normal pages of the standard WebLogic admin console, rather than being a separate console per se. The extension provides a view onto the values of the WebLogic generated Spring MBeans

  D: If you have an issue, you use the Oracle Support organisation for help with WebLogic specific problems and any Spring parts to your application are treated just like your own custom code is, from an Oracle Support perspective.

  E: WebLogic Injected Spring Beans is a Weblogic feature that is enabled by default.

  Reference: WebLogic and Spring

• Question 73:

  How can you configure High Availability for interacting with a non-Oracle database using WebLogic?

  A. Configure multiple physical data sources and reuse the same JNDI name for each.

  B. Use the "compatibility" option of Active GridLink to enable compatibility with non-Oracle databases.

  C. Configure a single physical data source for each node in a database cluster and wrap it using Multi Data Source.

  D. Configure a Data Source Group that contains a physical connection pool to each node in the database cluster.

  Correct Answer: C

  Note:

  *

  A multi data source can be thought of as a pool of data sources. Multi data sources are best used for failover or load balancing between nodes of a highly available database system, such as redundant databases or Oracle Real Application Clusters (Oracle RAC).

  *

  (not B) A single GridLink data source provides connectivity between WebLogic Server and an Oracle Database service, which may include multiple Oracle RAC clusters

  *

  High Availability Storage Solutions

  If you have applications that need access to persistent stores that reside on remote machines after the migration of a JMS server or JTA transaction log, then you should implement one of the following highly-available storage solutions:

  / File-based stores (default or custom)--Implement a hardware solution, such as a dual-ported SCSI disk or Storage Area Network (SAN) to make a file store available from shareable disks or remote machines.

  / JDBC-accessible stores--Configure a JDBC store or JDBC TLOG store and use JDBC to access this store, which can be on yet another server. Applications can then take advantage of any high-availability or failover solutions offered by your database vendor. In addition, JDBC stores support GridLink data sources and multi data sources, which provide failover between nodes of a highly available database system, such as Oracle Real Application Clusters (Oracle RAC).

  Reference: Oracle Fusion Middleware Configuring Server Environments for Oracle WebLogic Server 12c, High Availability Storage Solutions

• Question 74:

  Identify three components of the WebLogic JMS architecture.

  A. JMS Server

  B. JMS Module

  C. Node Manager

  D. Queue Manager

  E. Persistent Store

  Correct Answer: ABE

  The major components of the WebLogic JMS Server architecture, as illustrated in the figure below.

  *

  (A) JMS servers that can host a defined set of modules and any associated persistent storage that reside on a WebLogic Server instance.

  *

  (B) JMS modules contains configuration resources (such as queues, topics, and connections factories) and are defined by XML documents that conform to the weblogic-jmsmd.xsd schema.

  *

  Client JMS applications that either produce messages to destinations or consume messages from destinations.

  *

  JNDI (Java Naming and Directory Interface), which provides a resource lookup facility. JMS resources such as connection factories and destinations are configured with a JNDI name. The runtime implementations of these resources are then bound into JNDI using the given names.

  *

  (E) WebLogic persistent storage (file store or JDBC-accessible) for storing persistent message data.

  The following figure illustrates the WebLogic JMS architecture.

  

  Reference: Understanding WebLogic JMS

• Question 75:

  Which three scenarios are true about Domains?

  A. Domains can be created using the Configuration Wizard.

  B. Domains can be created using WLST.

  C. Domain configuration files are located in the WebLogic home directory.

  D. Domains can be created based on a domain template.

  Correct Answer: A

  A: a WebLogic domain can be created by using the Configuration Wizard in graphical mode.

  B: WLST enables you to create a new domain or update an existing domain

  D: A domain template is a JAR file that contains domain configuration documents, applications, security data, startup scripts, and other information needed to create a domain.

• Question 76:

  Assume that you would like to clone an existing WebLogic Domain and enable some customizations. What scenario would you choose?

  A. In the Enterprise Manager, find the domain to be cloned. Choose "Clone WebLogic Domain" from the context menu. In the graphical wizard, customize and extend the domain if needed. These steps will only clone only the domain configuration. Binaries with deployments are needed to be cloned by operation on the file system.

  B. In the Enterprise Manager, find the domain to be cloned. Choose "Clone WebLogic Domain" from the context menu. In the graphical wizard, customize the domain. These steps clone the binaries and domain configuration. If the extension is needed, perform it after cloning in the WebLogic web-based console.

  C. In the Enterprise Manager, find the domain to be cloned. Choose "Clone WebLogic Domain" from the context menu. In the graphical wizard, customize and extend the domain if it is needed. These steps clone the binaries and domain configuration.

  D. In the Enterprise Manager, find the domain to be cloned. Choose "Clone WebLogic Domain" from the context menu. These steps clone the binaries and domain configuration. If the customization or extension is needed, complete that after cloning in the WebLogic web-based console.

  E. In the file system, copy the domain structure of the configuration directory and paste it in the new location. Modify configuration files for address and port. If further customization is needed, open the WebLogic web-based console and perform these modifications.

  Correct Answer: C

  The Clone WebLogic Domain option launches a wizard that enables you to clone a WebLogic Domain from an existing reference domain that is already discovered with Cloud Control. It allows you to clone the Middleware Home and its binaries, and the domain configuration.

  * If you selected the Cloning a WebLogic Domain option, the Middleware Provisioning: Domain Configuration page appears. This page contains a set of links to several pages where you can enter the properties that are most likely to be reconfigured like domain name, listen addresses for the administration server and managed servers, Node Manager/Machine configuration, and JDBC data sources.

• Question 77:

  Identify the two options that can be used to patch WebLogic Server without Incurring application downtime.

  A. automated process using the Admin Server

  B. automated using JDeveloper

  C. manual process with or without Smart Update

  D. scripted with WLST

  E. automated process using Enterprise Manager 12c

  Correct Answer: CD

  Note:

  * Rolling Upgrade is the process of upgrading a running WebLogic Server cluster with a patch, maintenance pack, or minor release without shutting down the entire cluster or domain. During the rolling upgrade of a cluster, each server in the cluster is individually upgraded and restarted while the other servers in the cluster continue to host your application.

• Question 78:

  WebLogic 12c, the Maven plug-in has been enhanced with which Maven goal?

  A. wls:unzip, wls:install-domain, wls:start-domain, wls:wlst, wls:appc

  B. wls:install, wls:install-domain, wls:start-domain, wls:wlst, wls:appc

  C. wls:unzip, wls:create-domain, wls:start-domain, wls:wlst, wls:appc

  D. wls:install, wls:create-domain, wls:start-server, wls:wlst, wls:appc:

  Correct Answer: D

  wls-maven-plugin--Delivered in WebLogic Server 12c, provides enhanced functionality to install, start and stop servers, create domains, execute WLST scripts, and compile and deploy applications.

  Reference: Developing Applications for Oracle WebLogic Server, Using the WebLogic Development Maven Plug-In

• Question 79:

  You have a durable subscriber, and the subscriber is down or not reachable when the message is produced. Which two options regarding the expiry of these messages are true?

  A. after the subscriber is unavailable for 10 minutes

  B. when the subscriber is available

  C. after the subscriber is unavailable for after an hour

  D. are available until the specified time elapses

  E. are expired instantly

  Correct Answer: BD

  By default, JMS messages never expire. When applications send messages to queues or topics with durable subscribers, WebLogic must retain the message until it is consumed. This is fine in most point-topoint messaging applications because consumers are constantly consuming messages. Any message sent to a queue will typically be consumed in a relatively short period of time. If the consumers get disconnected, they will usually reconnect as soon as possible and start processing any messages that might have built up in the queue.

  D: For durable subscribers to a topic, this is not necessarily true. The messaging system is forced to retain any message that has not been consumed by a durable subscriber, regardless of whether that durable subscriber will ever return. In this case, WebLogic is at the mercy of the durable subscriber to unsubscribe when it no longer wishes to receive the messages. If the durable subscriber logic is flawed in such a way that the subscribers do not unsubscribe properly, the messaging system will start to fill up with messages that may never be delivered. This calls for real caution in using durable subscribers. Fortunately, there is another way to help deal with this problem. Message expiration can be set at the connection factory level. Using a connection factory's default time-to-live attribute, we can specify the number of milliseconds that WebLogic should retain an undelivered message after it is sent.

• Question 80:

  What are the three steps you should take to tune a JDBC Connection pool in WebLogic from the initial settings in a production environment?

  A. Ensure the maximum size is increased to an appropriate setting.

  B. Set the minimum and maximum size of the connection pool to the same value.

  C. Increase the statement cache size.

  D. Add more heap to the JVM.

  E. Add more nodes to the cluster.

  Correct Answer: ACE

  A:

  *

  Troubleshooting Slow Response Time from the Client and Low Database Usage These symptoms are

  usually caused by a bottleneck upstream of the database, perhaps in the JDBC connectionpooling. Monitor

  the active JDBC connections in the WebLogic Console and watch for excessive waiters and wait times;

  increase the pool size, if necessary.

  *

  Attribute: Maximum Capacity

  Maximum number of physical database connections that this connection pool can contain. Different JDBC

  Drivers and database servers may limit the number of possible physical connections.

  C: Attribute: Statement Cache Size

  The algorithm used to maintain the statement cache:

  LRU - After the statementCacheSize is met, the Least Recently Used statement is removed when a new statement is used.

  Fixed - The first statementCacheSize number of statements is stored and stay fixed in the cache. No new statements are cached unless the cache is manually cleared.

  E: If the queue appears starved but adding execute threads does not improve performance, there may be resource contention. Because CPU utilization is low, the threads are probably spending much of their time waiting for some resource, quite often a database connection. Use the JDBC monitoring facilities in the console to check for high levels of waiters or long wait times. Adding connections to the JDBC connection pool may be all that is required to fix the problem.

  Note:

  * If you had a JDBC connection pool where the Initial Capacity and Maximum Capacity attributes were different, you might want to create a gauge monitor to monitor the maximum and minimum number of connections. By setting the Threshold Low value to be one less than the Initial Capacity, your gauge monitor trapcould monitor the ActiveConnectionsCurrentCount attribute of the JDBCDataSourceRuntime MBean and alert you whenever the number of active connections are less than the Initial Capacity (which might indicate database connectivity problems).