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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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UNIX Interview Questions and Answers UNIX or Linux operating system has become default Server operating system and for whichever programming job you give interview you find some UNIX command interview questions there. These UNIX command interview questions are mostly asked during Java development and Support role interviews on various investment banks mostly because most of electronic trading systems or stock trading system works on Unix servers. As we know that high volume low latency systems which wants to take advantage of little bit of volatility in market for Equity , Futures and options or Foreign exchange trading need a stable server side operating system and Redhat Linux is doing great job there. with the advent of Algorithmic trading this speed factor becomes more important so getting someone who has good knowledge of operating system and commands on which these trading system runs is definitely required. but these UNIX command interview questions are equally applicable for any job interview which requires some work on Unix Operating System. With the growing use of Linux in form of RedHat, Solaris and IBM AIX its must to keep you familiar with essential Linux commands available on various platforms. Unix and Linux Command Interview Questions and AnswersLong back I had once asked one of my friend why are you preparing Unix Command interview questions if you going for a Java Interview and he told me that this job doesn't only require knowledge of Java but also knowledge of Unix, Linux, SQL and other scripting language , which is quite true. After that I thought to collect various UNIX command interview questions asked to Java developers or trading system support interviews and this is the result of that compilation. This list of UNIX command interview questions are by means complete and would be great if you guys contribute some genuine and good Unix Command Interview questions and answers asked during interviews. I have divided the questions on three categories for sake of managing and keeping this list of Unix Interview questions up to date. Read more: http://javarevisited.blogspot.com/2011/05/unix-command-interview-questions.html#ixzz3W1UbYiXn

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Visualizing Data • Creating Visualizations • Creating Dashboards • Creating Alerts • Creating Alerts through a Wizard • Tuning Alerts Using Manager • Customizing Actions for Alerting • The Alerts Manager G. Recipes for Monitoring and Alerting • Monitoring Recipes • Monitoring Concurrent Users • Monitoring Inactive Hosts • Reporting on Categorized Data • Comparing Today’s Top Values to Last Month’s • Finding Metrics That Fell by 10% in an Hour • Charting Week Over Week Results • Identify Spikes in Your Data • Compacting Time-Based Charting • Reporting on Fields Inside XML or JSON • Extracting Fields from an Event • Alerting Recipes • Alerting by Email when a Server Hits a Predefined Load • Alerting When Web Server Performance Slows • Shutting Down Unneeded EC2 Instances • Converting Monitoring to Alerting H. Grouping Events • Introduction • Recipes • Unifying Field Names • Finding Incomplete Transactions • Calculating Times within Transactions • Finding the Latest Events • Finding Repeated Events • Time Between Transactions • Finding Specific Transactions • Finding Events Near Other Events • Finding Events After Events • Grouping Groups I. Lookup Tables • Introduction • lookup • inputlookup • outputlookup • Further Reading • Recipes • Setting Default Lookup Values • Using Reverse Lookups • Using a Two-Tiered Lookup • Using Multistep Lookups • Creating a Lookup Table from Search Results • Appending Results to Lookup Tables • Using Massive Lookup Tables • Comparing Results to Lookup Values • Controlling Lookup Matches • Matching IPs • Matching with Wildcards J. Splunk Quick Reference Guide & Advanced topics • Case Sensitivity • Top Commands • Top Resources • Events • Sources and Sourcetypes • Hosts • Indexes • Fields • Tags • Event Types • Reports and Dashboards • Apps • Permissions/Users/Roles • Transactions • Forwarder/Indexer • SPL • Subsearches • Relative Time Modifiers • Common Search Commands • Optimizing Searches • Search Examples • Eval Functions • Common Stats Functions • Regular Expressions • Common Splunk STRPTIME Functions

sadguru technologies 8179736190​ output lookup • Further Reading • Recipes • Setting Default Lookup Values • Using Reverse Lookups • Using a Two-Tiered Lookup • Using Multistep Lookups • Creating a Lookup Table from Search Results • Appending Results to Lookup Tables • Using Massive Lookup Tables • Comparing Results to Lookup Values • Controlling Lookup Matches • Matching IPs • Matching with Wildcards J. Splunk Quick Reference Guide & Advanced topics • Case Sensitivity

sadguru technologies -8179736190 Finding Specific Transactions Finding Events Near Other Events Finding Events After Events Grouping Groups A.Lookup Tables Introduction lookup inputlookup outputlookup Further Reading Recipes Setting Default Lookup Values Using Reverse Lookups Using a Two-Tiered Lookup Using Multistep Lookups Creating a Lookup Table from Search Results Appending Results to Lookup Tables Using Massive Lookup Tables Comparing Results to Lookup Values Controlling Lookup Matches Matching IPs Matching with Wildcards B.Splunk Quick Reference Guide & Advanced topics Case Sensitivity Top Commands Top Resources Events Sources and Sourcetypes Hosts

sadguru technologies-040-40154733 Finding Specific Transactions Finding Events Near Other Events Finding Events After Events Grouping Groups A.Lookup Tables Introduction lookup inputlookup outputlookup Further Reading Recipes Setting Default Lookup Values Using Reverse Lookups Using a Two-Tiered Lookup Using Multistep Lookups Creating a Lookup Table from Search Results Appending Results to Lookup Tables Using Massive Lookup Tables Comparing Results to Lookup Values Controlling Lookup Matches Matching IPs Matching with Wildcards B.Splunk Quick Reference Guide & Advanced topics Case Sensitivity Top Commands Top Resources Events Sources and Sourcetypes Hosts Indexes Fields Tags Event Types Reports and Dashboards Apps Permissions/Users/Roles Transactions

Finding Specific Transactions Finding Events Near Other Events Finding Events After Events Grouping Groups A.Lookup Tables Introduction lookup inputlookup outputlookup Further Reading Recipes Setting Default Lookup Values Using Reverse Lookups Using a Two-Tiered Lookup Using Multistep Lookups Creating a Lookup Table from Search Results Appending Results to Lookup Tables Using Massive Lookup Tables Comparing Results to Lookup Values Controlling Lookup Matches Matching IPs Matching with Wildcards B.Splunk Quick Reference Guide & Advanced topics Case Sensitivity Top Commands Top Resources Events Sources and Sourcetypes Hosts Indexes Fields Tags Event Types Reports and Dashboards Apps Permissions/Users/Roles Transactions Forwarder/Indexer SPL Subsearches Relative Time Modifiers

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