Unix sunsolaris admin

Overview: UNIX is an operating system which was first developed in the 1960s, and has been under constant development ever since. By operating system, we mean the suite of programs which make the computer work. It is a stable, multi-user, multi-tasking system for servers, desktops and laptops.UNIX systems also have a graphical user interface (GUI) similar to Microsoft Windows which provides an easy to use environment. ABOUT ECORPTRAININGS: Ecorp Trainings are one of the best institute providing quality level of training in E-learning process.This is instructor led online training. We also provide corporate training , if group of people interested in same technology. Contact us for detailed course content & register for a free demo. We also provide support in client interviews , resume preparation , ticket resolving. Contact us for custom designed training course by experts exclusively for yourself. We provide training for almost all IT technologies i.e ; JAVA , DOTNET , SAP ,ORACLE , PEOPLESOFT ,HYPERION etc, contact us if you have any particular need. ECORP TRAININGS. Gtalk ID : ecorptrainings Skype ID : ecorptrainings

10 Linux and UNIX Interview Questions and Answers asked in Wipro TCS Capegemini UNIX and Linux Interview Questions and Answers Questions from various UNIX operating systems e.g. Solaris, Linux, IBM AIX or any other UNIX operating system is asked on different support and programming interviews. I have always seen few interview questions from Linux and UNIX along with SQL in almost every Java programming interviews. You just can not afford not to prepare questions from UNIX and Linux until your Job absolutely doesn't require any work in UNIX operating system. I have collected many UNIX command interview questions and already shared them but I found that except system admin jobs, many programming job interviews only focus on general UNIX commands e.g. chmod, find or grep and fundamentals like finding files and directories, managing file space, networking commands, checking process status and managing file permissions. In this article we will see such kind of frequently asked interview questions and answers from UNIX and Linux operating System. Questions are very fundamental in nature and not limited to Linux only and equally applicable to other UNIX operating systems e.g. Solaris, IBM AIX etc. Many of these UNIX questions are asked during various interviews on companies like TCS, Infosys, Citibank , Wipro, Capegemini and Tech Mahindra. But as I said they are very fundamental and can be asked in any company. UNIX and Linux Interview questions answers

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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sadguru technologies 8179736190 040-40154733 Description for "UNIX/LINUX ADMINISTRATION training in usa uk" We are providing Oracle SOA11g/BPEL, AIA3.0, OSB, Web Logic & SOA Admin, JAVA, Call center Training, SCM (Classroom & Online),BO,Callcenter Training under Yashwanth, M.Tech, and Technical Manager in CMMI Level 5 Company with 9 years of middleware experience, successfully placed above 500 members in 1 year. Special Feature: We are providing 24/7 Online Lab facility, Student can connect from home to do the LAB practical. Offered Courses: 1. Oracle SOA Suite11g/BPEL (Normal Track, Fast Track & Online) training 2. Oracle AIA 3.0, ADF and OSB training 3. SOA & Web Logic Administration training 4. JAVA (Core, Adv & Frameworks) 5. Call center Training 6. SCM (Supply Chain Management)

sadguru technologies 8179736190 040-40154733 Description for "UNIX/LINUX ADMINISTRATION training in usa uk" We are providing Oracle SOA11g/BPEL, AIA3.0, OSB, Web Logic & SOA Admin, JAVA, Call center Training, SCM (Classroom & Online),BO,Callcenter Training under Yashwanth, M.Tech, and Technical Manager in CMMI Level 5 Company with 9 years of middleware experience, successfully placed above 500 members in 1 year. Special Feature: We are providing 24/7 Online Lab facility, Student can connect from home to do the LAB practical. Offered Courses: 1. Oracle SOA Suite11g/BPEL (Normal Track, Fast Track & Online) training 2. Oracle AIA 3.0, ADF and OSB training 3. SOA & Web Logic Administration training 4. JAVA (Core, Adv & Frameworks) 5. Call center Training 6. SCM (Supply Chain

sadguru technologies 8179736190 040-40154733 Description for "UNIX/LINUX ADMINISTRATION training in usa uk" We are providing Oracle SOA11g/BPEL, AIA3.0, OSB, Web Logic & SOA Admin, JAVA, Call center Training, SCM (Classroom & Online),BO,Callcenter Training under Yashwanth, M.Tech, and Technical Manager in CMMI Level 5 Company with 9 years of middleware experience, successfully placed above 500 members in 2. Oracle AIA 3.0, ADF and OSB training 3. SOA & Web Logic Administration training 4. JAVA (Core, Adv & Frameworks) 5. Call center Training 6. SCM (Supply Chain Management)

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