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Hyderabad (Andhra Pradesh)
I often get mails from people asking what are the questions generally asked in Weblogic by interviewers. Generally for an Administrator’s positions, in addition to Weblogic questions, there are a lot of Unix questions and a few questions related to process and case handling. These are the important questions that I cover while interviewing. 1. How do you differentiate between a server hang and server crash issue? When a Server crahes, the JAVA process no longer exists. When the Server is hung, it stops responding. We can use the weblogic.ADMIN utilty to ping the server. In case of a hang situation we can take multiple thread dumps and analyze the cause of hang. 2. What can be the various reasons for a server crash? a) Native IO b) SSL Native Libraries c) JVM d) Supported Configuration e) JDBC Driver issue 3. How do you troubleshoot a crash? JVM crash generates a hs_err_pid file. We need to look into the stack trace of the hs_err_pid file . If the thread is from a native io, we need to disable native io. if the stack trace is from the driver, we need to get in touch with the drive team. Quite possibly its a problem with driver. Changing the type of driver can be a workaround. If the thread shows it coming from an optimzed code, we can turn of optimization. If the stack is from native calls of application, its a bug with the application and it has to b modified. 4. Ho do you troubleshoot Server Hang? We can use java weblogic.Admin PING to check if we get a normal response. We need to take multiple thread dumps with kill -3 pid on unix and CTLR Break on Windows. Analyze the thread dump to find the root cause. 5. What can be the reasons of Server hang? Memory leak, databse query taking a long time to return, Deadlock. 6. What is memory leak? Memory leak is when objects are not romved from the heap even when they are not required. 7. What are the various causes for OUT OF MEMORY? a) Insufficient heap size, not able to match the extra load. b) Objects licing too long, like HTTP Sessions. c) Memory leak in application code. d) Full GC not happening due to JVM Bug. 8. How to troubleshoot and overcome such issues? Gather memory data by enabling GC verbose. If its due to Http Session, timing out http session after certain interval might help. Look into the code for jdbc connection handling. Optimizing the heap size according to the load. 9. When does High CPU Usage occur? It occurs when one process or one thread utilizes unexpectedly high proportion of CPU. 10. How to troubleshoot it? In Solaris environment, we need to take pstack and prstack and see what the threads are doing. In Windows we need to use pslist and process explorer. 11. What is Clustering and what is achieved through it? Clustering is the grouping together of servers for the purpose of high availability and scalability. Load balancing and Failover is achieved. 12. How does Cluster Communication Happen? Members of the Cluster communicate over the Cluster Multicast IP and Port by sending periodic heart beat messages. 13. What is the difference between the Sun JVM and BEA JRockit JVM? The most well know JVM is the implementation from Sun. The Sun JVM is called HotSpot. The Sun JVM is shipped in the Java Developer’s Kit (JDK) and Java Runtime Environment (JRE) from Sun. The BEA JRockit JVM from BEA systems is optimized for reliability and performance for server side applications. To achieve this, BEA JRockit JVM uses technologies such as code generation, hot spot detection, code optimization, advanced garbage collection algorithms and tight operating system integration. 14. TUning JVM Parameters. If you have a single processor, single thread machine then you should use the serial collector (default for some configurations, can be enabled explicitly for with -XX:+UseSerialGC). For multiprocessor machines where your workload is basically CPU bound, use the parallel collector. This is enabled by default if you use the -server flag, or you can enable it explicitly with -XX:+UseParallelGC. If you’d rather keep the GC pauses shorter at the expense of using more total CPU time for GC, and you have more than one CPU, you can use the concurrent collector (-XX:+UseConcMarkSweepGC). Note that the concurrent collector tends to require more RAM allocated to the JVM than the serial or parallel collectors for a given workload because some memory fragmentation can occur.
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Jaipur (Rajasthan)
Online training advantages:- Online Linux Training Programs headed by a live instructor with all benefits of in-person training. The biggest advantage of an online course is that Time Flexibility According to your convenient time. You can study any time you want. The online training eliminates the fear of asking questions. For more details please visit:- http://www.grras.com/online-linux-training.php. GRRAS Linux Training and Development Center 219, Himmat Nagar, Behind Kiran Sweets, Gopalpura Turn, Tonk Road, Jaipur(Raj.) Email: info@grras.com http://www.grras.com/
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Jaipur (Rajasthan)
Online training advantages:- Online Linux Training Programs headed by a live instructor with all benefits of in-person training. The biggest advantage of an online course is that Time Flexibility According to your convenient time. You can study any time you want. The online training eliminates the fear of asking questions. For more details please visit:- http://www.grras.com/online-linux-training.php GRRAS Linux Training and Development Center 219, Himmat Nagar, Behind Kiran Sweets, Gopalpura Turn, Tonk Road, Jaipur(Raj.) Email: info@grras.com http://www.grras.com/
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Delhi (Delhi)
AROMA PUBLISHING HOUSE, books by vinay - Asking price is Negotiable for this Books For preparation of ONGC, DRDO, GATE, IES and other psu 's examinations, following books are outstandingly helpful: ->> Objective Question Bank in Electronics engineering (With explanatory answers) -- By A Panel of Experts; Pages: 608, Price: 545/- Publisher: Aroma Publishing House. Objective Question Bank in Electrical engineering (With explanatory answers) -- By A Panel of Experts; Price: 345/- Publisher: Aroma Publishing House. Contains: Original previously asked questions with detailed solutions.
₹ 500
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Kochi (Kerala)
NEET Entrance preparation guide by Byjus. New edition. Package contains 2 physics books, 2 chemistry books and 2 biology books. Byjus NEET Entrance guides will help the child for their preparation for NEET. It will help the child to study difficult concepts in a better and simple method. Will strengthen their knowledge in 11th and 12th classes. Each book contains a seperate daily practice questions booklet with it. Actual price of 1 book is 780rs. Asking price for one book is 700rs. Books can be purchased seperately or the whole bundle. Full bundle costs 4000rs (6 books)
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Nellore (Andhra Pradesh)
1.To develop the basic reading and writing skills of first year engineering and technology students. 2.To help learners develop their listening skills, which will, enable them listen to lectures and comprehend them by asking questions; seeking clarifications. 3.To help learners develop their speaking skills and speak fluently in real contexts. 4.To help learners develop vocabulary of a general kind by developing their reading skills
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Coimbatore (Tamil Nadu)
Written by National Best selling Author K. Vijayakarthikeyan A patriotic IAS officer, Vikram, decides to expose a corrupt and powerful minister, Rudra Pratap Rana (aka RPR), during the latter's visit to the LAS training academy. The video of Vikram asking the minister some highly embarrassing questions in front of a packed auditorium goes viral. Instead of having Vikram suspended from service, a vengeful RPR unleashes violence on the officer's family, and to continue the torture, RPR gets Vikram posted as the sub-divisional magistrate in Laxmipur-the politician's backyard. As soon as Vikram joins duty, RPR resumes his vengeance. However, a new drama unfolds when a large number of people start dying of heart attacks across Laxmipur. As Vikram tries to unravel these mysterious deaths with the help of Veda, a cardiologist, and Raghu, a police officer extreme panic grips the city, which soon leads to riots and pandemonium. Vikram is left with no other choice but to risk his life to get to the bottom of this mind-numbing situation.
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