Microservices The term “Microservice Architecture” has sprung up over the last few years to describe a pattern of splitting an application into smaller components for scalability and maintenance benefits and have seen widespread adoption. Idea: The main idea behind this architecture is to break down applications into very small pieces and each piece can be […]
SQL SQL : Structured query language that help us to access or manipulate data from the database. We can CREATE, UPDATE, DELETE and retrieve data while using SQL. RDBMS : Relational Database Management System. It is the basis of SQL. It is for modern data base systems like MySQL, Oracle. In RDBMS the data
Display the highest salary Select max(salary) from employee Select salary from employee order by salary desc limit 1 select top1 salary from employee order by salary desc
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Sample Mock interview. General What is your day to day routine? We have daily stand-ups and defect meetings where we discuss the defects and get status of the defects. Attend meetings for business requirements and then plan our test plan. Based on requirements , we add/update our test cases. Once any feature is deployed on
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Tools used in IT projects Code Editor/IDE : These are the tools which are used for writing codes. Popular ones are Eclipse, IntelliJ Code versioning tools : These are the tools that are used to maintain and host your code. It helps developers/programmers to track, maintain and keep their code in one place,
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Notes on Software testing: There are mainly four ways of reducing bugs from a program, which includes: -Review -Testing -Specification and verification of the program -Appropriate use of development process. Difference between verification and validation: Verification is the process where the output of one phase of the development confirms the previous level, whereas validation
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Guide to Basic SQL SQL : SQL stands for Structured Query Language and it allows us to access and update databases. In this topic we will discuss very basic sql commands with simple syntaxes. How to create table: Use command “ Create Table TableName ( columnName type, columnName type) ; ” Example : CREATE
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Learn Basic Linux for beginners: What is Linux? Linux is an open source operating system based on UNIX. It is mainly used as servers where applications and databases are hosted. Assumption for audience : Totally new to Linux This topic will cover basic Linux command that can be used on day to day
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Setting up Swagger document for a Spring project Swagger document is a widely used conventional documentation used to exchange REST apis information. Many developers write the full document, known as swagger specs using some tool or manually. However, The best documentation is the one that is very close to the code. Some of the popular
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Some handy Linux commands for files transfer and updates Copy file from local machine to docker. This is a very common scenario in our day to day work routine to copy a file from a local machine to a VM which is running your docker image. Let’s make it into simple steps. Most of the
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How to write a mock service in Apigee Need : Many times, we have the details of the microservice that we need to use but the actual microservice is not ready. We only have swagger specs. Sometimes, we are not supposed to hit actual endpoints due to data issues or some data cost issues,
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Solution Designing For most of the solution designs, we can follow the below processes: a) What is the problem? We have to find the problem first before coming up with any solution. The problem must be clear. b) Information Gathering Now we know the problem, let’s start with data collection. Gather as much information and
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Node Js Express Server Express.js is a web application framework for Node.js. Express.js is based on the Node.js middleware module called connect which in turn uses http module. Core Features of express: Set up middleware for handling HTTP requests. Routing tables’ setup for performing actions based on urls. Render HTML pages Why Express Js when we have http?
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Node JS Callbacks and Events CallBacks: Callbacks are used for making asynchronous handling of functions. The process will run and do not block the next lines of execution and once the process is completed, it makes a callback action to perform actions of that data from the process. Let’s say we have below pseudo
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Node Js File Module Node Js File module helps to interact with files on the system we are operating. We need to import the “fs” module to use this feature of interacting with files. We can operate functions like reading files, write files, update files, rename files and delete files. Fs module offers both
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Node.js http Module Node.js has a built-in HTTP module that helps to create a server and send response back to users. Let’s start with some examples Create a simple server and return query string Create a javascript file example5.js and type below code var http = require(“http”); http.createServer(function (request, response) { response.writeHead(200, {‘Content-Type’:
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Node Js Modules A Module or a library is a set of functions that can be imported and can be used for performing various processes in Node js. Node Js Inbuilt Modules When we install Node js, we get a list of in built Node Js modules which we don’t need to install and they
Node.js, an open-source and cross-platform server environment that allows us to run JavaScript on the server. Key features of Node.js: Event Driven architecture Non blocking Input/Output API Real time two way communication between client and server built on Google Chrome’s JavaScript V8 Engine Very Fast Never buffer any data and simply output the data in
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JWT (JSON Web Token) JWT Definition : A JSON web token(JWT) or (“jot”) is JSON Object used to securely transfer data over the web. It is mostly used for sending authentication data. JWT Need: 1) Everything going stateless Consider the below situation, where we have REST APIs to provide data to the user. Firstly,
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SaaS VS PaaS VS IaaS In SaaS, everything is managed by vendor and companies just need to use the application. Example: Google Apps, Apigee, Salesforce. In PaaS, companies have to manage applications and data, rest all is managed by the vendors. Example: AWS Elastic Beanstalk In IaaS, companies have to manage applications, data, middleware, OS
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JQ jq is a library written in C and produces functionalities like sed for JSON data. JSON is getting popular and used in various applications and many a time, developers or applications have to parse or read through JSON data or files. JQ comes very handy in these cases. Let’s install it We can install
Helm Kubernetes has already gained popularity as a leading container orchestration system. Helm plays an important role in managing the application. Helm helps us to define, install, and upgrade complex Kubernetes applications.One can use helm to template everything. Components to know in Helm: Chart: A helm package having all definitions required to run applications or
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Kubernetes Nowadays, every application wants to have high availability, fast deployments and reduce environment-related issues,and which has led to an era of containerized applications. Docker is one of a very popular container used as a container. Managing multiple containers is also a challenge and can help in releasing applications with low downtime. Kubernetes, a Google
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Performance tuning in SQL queries Is your application running very slow? Are your database calls taking a lot of time? Are your database calls timing out? Well, many developers test in an environment where the number of records is low in database tables and they do not find the performance issues in their database calls.
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React js Reactjs is very fast as compared to plain javascript as it uses virtual dom. It creates components which are easy to use and maintain Setting up the environment: Install node.js Download react-create-app , refer : https://reactjs.org/docs/create-a-new-react-app.html Run these commands npx create-react-app my-app cd my-app npm start If there are errors running
Docker We can containerize the applications with all related dependencies, libraries, configurations, infrastructure so that application works independently. Components: Docker Client: Docker build pull and run operations and establish communication with the Docker Host. Docker Host: This component contains Docker Daemon, Containers and its images. Registry: This component will be storing the Docker images/ Docker
Why Go : Easy to use and fast compile time Features: -Simple -Fast compile times -Auto and fast Garbage collected -Better in concurrency Go to https://tour.golang.org and check out all the details. Download Go from here : https://golang.org/dl/ It has nice play area for learning and practicing. Also Try Gopher Slack for GO community
Some points to remember while selecting solutions using AWS AWS support Basic, Developer, Business, and Enterprise S3 – Simple storage service – Key-based Object storage – object size 0-5 TB – Max put size – 5 GB – Use multiple upload feature for size >100 MB – Use Multipart Upload API if object size
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It is an extension of OAuth 2.0 protocol where in it adds more information for application. In OAuth 2.0, application get security/authorization token which can be used to access downstream apis. With OpenID Connect, application can get information about end user and their profile information. Flow:Get an id_tokenRetrieve profile information from the UserInfo endpoint using
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