Interview Preparation

What Is JMeter?JMeter is a Java tool for load testing client/server applications, now used for testing web, API, and database performance and functionality. Explain How JMeter Works:Simulates users sending requests, collects server responses and stats, and shows application performance in graphs/tables. Where Can You Use Functions and Variables?Insert into fields of any test component to parametrize and automate your test plan. What Are Regular Expressions in JMeter?For pattern matching and dynamic data extraction throughout a test plan. What Are Samplers and Thread Groups?Thread groups set user count and ramp-up; samplers send requests (HTTP, FTP, JDBC, etc.). (Continues with all your original questions/answers...)

2025 Latest JMeter Interview Questions & Answers:

What’s new in JMeter 5.x and above?Improved Plugin Manager, new timers (Poisson, Precise Throughput), Non-GUI CI/CD integration, WebSocket/gRPC plugins. These enable advanced, …

Latest Hadoop Interview Questions & Answers (2025 Update)

What are the key differences between Hadoop 1 and Hadoop 2?Hadoop 1 had a single JobTracker, which limited scalability. Hadoop 2 introduced YARN, separating resource management from job scheduling. This allowed multiple frameworks like Spark and Tez to run on the same cluster. Hadoop 2 also supports high availability for the NameNode.

How do you optimize a MapReduce job?You can optimize by tuning the number of mappers and reducers. Use a Combiner to reduce shuffle data. Write efficient map and reduce logic. Monitor counters and execution time to detect bottlenecks. Compress intermediate data to speed up transfers.

Explain the concept of data locality in Hadoop.Data locality means moving computation closer to the data. Hadoop tries to run tasks on the same node where the data block exists. This reduces network traffic and speeds up processing.

How do you handle small files i…

Latest MongoDB Interview Questions & Answers (2025):

1. Does MongoDB support ACID transactions across multiple documents/collections?Yes, since version 4.0, MongoDB supports multi-document ACID transactions for replica sets, and from 4.2 onwards, for sharded clusters. Use startSession() and withTransaction() in drivers or shell to manage atomicity and rollbacks.​

2. What is the aggregation pipeline and why is it powerful?Aggregation pipelines allow data transformation via multiple stages ($match, $group, $project, $sort, $limit, etc.), supporting operations like grouping, filtering, and calculating metrics, similar to SQL GROUP BY but with greater flexibility and scalability.​

3. Explain sharding vs. replication.Replication (replica sets) provides high availability; data is copied to multiple nodes. Sharding enables horizontal scaling by splitting data across multiple servers (“shards”) to manage massive datase…

Php+mysql Interview Questions

Who Is The Father Of Php And Explain The Changes In Php Versions? Rasmus Lerdorf is known as the father of PHP. PHP/FI 2.0 is an early and no longer supported version of PHP. PHP 3 is the successor to PHP/FI 2.0 and is a lot nicer. PHP 4 is the current generation of PHP, which uses the Zend engine under the hood. PHP 5 uses Zend engine 2 which, among other things, offers many additional OOP features How Can We Submit A Form Without A Submit Button? The main idea behind this is to use Java script submit() function in order to submit the form without explicitly clicking any submit button. You can attach the document.formname.submit() method to onclick, onchange events of different inputs and perform the form submission. you can even built a timer function where you can automatically submit the form after xx seconds once the loading is done (can be seen in online test sites). In How Many Ways We Can Retrieve…

Blue Prism Interview Questions

What Is Robotic Automation? Robotic automation refers to a style of automation where a machine, or computer, mimics a human’s action in completing rules based tasks. What Is Blue Prism’s Robotic Automation? Robotic Automation refers to process Automation’s where computer software drives existing enterprise application software in the same way that a user does. Automation is a tool or platform that operates other application software through the existing application user interface. Is Robotic Automation Like Screen Scraping Or Macros? No, clerical Robotic Automation is a generation on from old technologies like screen scraping or macros. The major differences are: Robots are universal application orchestrators – any application that can be used by a person can be used by a modern robot, whether mainframe, legacy, bespoke application, web service enabled or even a closed 3rd party API hosted service.…

Sap Hybris Interview Questions

How To Run Multiple Hybris Instance In One Machine? Basically hybrid runs on a tomcat instance. Hybris is shipped with a bundled tomcat. So the question here is actually, how to run multiple tomcat in one machine. We can run as many hybris we want, till our machine memory permits. To do so, we need to make each instance of tomcat to have it’s own ports to use. Make below ports unique for each instance. We should add below properties in local property file of each instance with unique values.. tomcat.http.port=7001 tomcat.ssl.port=7002 tomcat.ajp.port=7009 tomcat.jmx.port=7003 tomcat.jmx.server.port=7004 Why Order Is Important In Items.xml? We need to follow an order in items.xml, when we declare item types in items.xml. Below are the reasons for it. Each items.xml is parsed in single pass. This means, more specific types are dependent on general types. In such case they should have been…

Tally Interview Questions What Is Tally? It's a powerful software on Accounting, In chittagong we are the only sole dealer of Tally accounting software. Tally is a method of communicating camera usage to the camera operator or subjects (called "talent"). Most professional-level cameras have a special TALLY light in the viewfinder and on front of the camera viewfinder that is activated when the camera is "taken" on the program buss of the video switcher. Why Did Tally Solutions Retire Tally 7.2? Tally 7.2 is already two generations behind in technology. Tally 8.1 was released almost 19 months ago, and Tally 9, almost 12 months ago. The current release is Tally 9 Release 2.1. Apart from being outdated and built on obsolete technology, most tools used for its development are no longer available or supported. This results in an inability to keep repairing and/or upgrading the product to meet the needs of continuously changing hardware and software environments. Is Tally…

Xml Interview Questions

What Is Xml? XML is the Extensible Markup Language. It improves the functionality of the Web by letting you identify your information in a more accurate, flexible, and adaptable way. It is extensible because it is not a fixed format like HTML (which is a single, predefined markup language). Instead, XML is actually a metalanguage—a language for describing other languages— which lets you design your own markup languages for limitless different types of documents. XML can do this because it's written in SGML, the international standard metalanguage for text document markup (ISO 8879). What Is A Markup Language? A markup language is a set of words and symbols for describing the identity of pieces of a document (for example ‘this is a paragraph’, ‘this is a heading’, ‘this is a list’, ‘this is the caption of this figure’, etc). Programs can use this with a style sheet to create output for screen, print, audio, video,…

Maven Interview Questions

What Is Maven? Maven is a project management and comprehension tool. Maven provides developers a complete build lifecycle framework. Development team can automate the project's build infrastructure in almost no time as Maven uses a standard directory layout and a default build lifecycle. What Does It Mean When You Say Maven Uses Convention Over Configuration? Maven uses Convention over Configuration which means developers are not required to create build process themselves. Developers do not have to mention each and every configuration details. What Are The Aspects Maven Managed? Maven provides developers ways to manage following: Builds Documentation Reporting Dependencies SCMs Releases Distribution mailing list How Do You Know The Version Of Mvn You Are Using? Type the following command : mvn --version What Is Pom? POM stands for Project Object Model. It is fundamental Unit of Work in …

Oracle Interview Questions

What Is Oracle? Oracle is a company. Oracle is also a database server, which manages data in a very structured way. It allows users to store and retrieve related data in a multiuser environment so that many users can concurrently access the same data. All this is accomplished while delivering high performance. A database server also prevents unauthorized access and provides efficient solutions for failure recovery. What Is An Oracle Database? An Oracle database is a collection of data treated as a big unit in the database server. What Is An Oracle Instance? Every running Oracle database is associated with an Oracle instance. When a database is started on a database server (regardless of the type of computer), Oracle allocates a memory area called the System Global Area (SGA) and starts one or more Oracle processes. This combination of the SGA and the Oracle processes is called an Oracle instance. The memo…