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Month: August 2017

Are you Confuse between IT Certifications or College Degrees for your Career

It doesn’t matter if you’re new to IT or an industry — you still might not be clear on whether you need certifications or degrees to move your career forward. Most of the time people will answer “it depends.” But there are good reasons why the answer differs like: ·         Depending on how much experience you have. ·         What area within IT you are most interested in? ·         What job you want to apply for? ·         What career path you have in mind? For most in the field today, however, the answer usually is do both, because the certification and the degree combined qualify you for a career path in which a certification or a degree by itself wouldn’t. Best Practices if your planning to upgrade your skills and advancing your career 1. Earn an Appropriate Certification for Your IT Field. Recent data from both IT leaders and HR hiring experts indicates that you have a clear advantage over your competition, especially in security, if you have a certification. In 2011 Information Security Leaders conducted a survey of more than 1300 people ranging from individual contributors to executive leadership. Here are some key findings from their survey. ·         An overwhelming number (3%) of those who have obtained a certification believe that the time/money spent was a good use of their resources, and 39.7% of respondents believe that investing in certification is the most important step for their careers....

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Tomcat on Linux

Apache Tomcat is an open source web server for Java application of Apache Foundation like Apache HTTP server. It used for deploying Java Servlet and JSP applications. To deploy any application in Tomcat we can simply create a war file and deploy them. For more details about you can visit apache official site . Check Java Version JAVA is the first requirement for Tomcat 7 installation. Make sure you have JAVA SE 6 or Later version installed in your system. Use the following command to check if you have java installed already on your system. # java -version java version “1.8.0_121” Java(TM) SE...

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HAProxy is a free, very fast and reliable solution offering high availability, load balancing, and proxying for TCP and HTTP-based applications. It is particularly suited for very high traffic websites and powers quite a number of the world’s most visited ones. Over the years it has become the de-facto standard open source load balancer, is now shipped with most mainstream Linux distributions, and is often deployed by default in cloud platforms HAProxy involves several techniques commonly found in Operating Systems architectures to achieve the absolute maximal performance: •    A single-process, event-driven model considerably reduces the cost of context switch and the memory usage. Processing several hundreds of tasks in a millisecond is possible, and the memory usage is in the order of a few kilobytes per session while memory consumed in preforked or threaded servers is more in the order of megabytes per process. •    Delayed updates to the event checker using a lazy event cache ensures that we never update an event unless absolutely required. This saves a lot of system calls. •    Single-buffering without any data copy between reads and writes whenever possible. This saves a lot of CPU cycles and useful memory bandwidth. Often, the bottleneck will be the I/O busses between the CPU and the network interfaces. At 10-100 Gbps, the memory bandwidth can become a bottleneck too. •    MRU memory allocator using fixed size...

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Amazon Web Services Interview Questions

Q. Explain what is AWS? AWS stands for Amazon Web Service; it is a collection of remote computing services also known as cloud computing platform.  This new realm of cloud computing is also known as IaaS or Infrastructure as a Service. Q. Mention what are the key components of AWS? The key components of AWS are ·          Route 53: A DNS web service ·          Simple E-mail Service: It allows sending e-mail using RESTFUL API call or via regular SMTP ·          Identity and Access Management: It provides enhanced security and identity management for your AWS account ·          Simple Storage Device or (S3): It is a storage device and the most widely used AWS service ·          Elastic Compute Cloud (EC2): It provides on-demand computing resources for hosting applications. It is very useful in case of unpredictable workloads ·          Elastic Block Store (EBS): It provides persistent storage volumes that attach to EC2 to allow you to persist data past the lifespan of a single EC2 ·          CloudWatch: To monitor AWS resources, It allows administrators to view and collect key Also, one can set a notification alarm in case of trouble. Q. Explain what is S3? S3 stands for Simple Storage Service. You can use S3 interface to store and retrieve any amount of data, at any time and from anywhere on the web.  For S3, the payment model is “pay as you go”. Q. Explain what is AMI? AMI...

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Oracle DBA Real Time Questions

1) How can you see the Current SCN number of the database?   Select current_scn from v$database; 2) How can you see the Current log sequence number the logwriter is writing in to? Select * from v$log; 3) If you are given a database, how will you know how many datafiles each tablespace contain? Select distinct tablespace_name,file_name from dba_data_files; 4). How will you know which temporaray tablepsace is allocated to which user? Select temporary_tablespace from dba_users where username=’SCOTT’; 5) If you are given a database,how will you know whether it is locally managed or dictionary managed? Select extent_management from dba_tablespaces where tablespace_name=’USERS’; 6) How will you list all the tablespaces and their status in a database? Select tablespace_name,status from dba_tablespaces; 7) How will you find the system wide 1) default permanent tablespace, 2) default temporary tablespace 3) Database time zone?  Select property_name,property_value from database_properties where property_name like ‘%DEFAULT%’; 8) How will you find the current users who are using temporary tablespace segments?  V$TEMPSEG_USAGE 9) How will you convert an existing dictionary managed permanent tablespace to temporary tablespace?  Not possible 10) Is media recovery requird if a tablespace is taken offline immediate? Not required 11) How will you convert dictionary managed tablespace to locally managed tablespace? Exec dbms_space_admin.tablespace_migrate_to_local(‘TABLESPACE_NAME’); 12) If you have given command to make a tablespace offline normal, but its not is in transactional read-only mode. How will...

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