Skip to main content

15 Best Memcached Interview Questions and Answers - Caching Data

What Is Memcached?
Memcached is very popular in-memory caching software.

Memcached is an open-source, free, high-performance, distributed memory object that speeds-up data-driven websites by caching data and objects in RAM.

Memcached was first developed by Brad Fitzpatrick for his website LiveJournal, on May 22, 2003.
Memcached is a component which stores data temporally for 1hour, 6hour, 12hours, 1day etc.

Memcached is used by Wikipedia, Twitter, Facebook, Flickr, Netlog, YouTube, etc.

Who Is the Author of Memcached?
The Author of Memcached is - Danga Interactive.

In which Language Memcached Is Written?
Memcached is written in C language. It was written by Danga Interactive.

When Memcached's Initial Version Launched?
The initial version of Memcached was launched in - May 22, 2003.

What Is Official website of Nginx?

What Is the best use of Memcached?
The Best use of Memcached:-
1.      Easy to install
2.      Improve the performance of web application by caching
3.      Memcached offers API integration for all the major languages like Java, PHP, C, C++, Python, Ruby, Perl etc.
4.      Reduced the burden of a database server
5.      We can update the values of keys
6.      We can use Tags for keys

What Are the limitations of Memcached?
1.      Memcached is not a database
2.      Memcached stores temporary data and permanently
3.      Memcached can’t cache large objects

Which Memcached Command is used to get the Version?
Version

Which Memcached Command is used to add the value of key?
Syntax - add [key] [flags] [exptim] [bytes] [noreply]
Example - add key 0 900 4

Which Memcached Command is used to get the value of key?
get key

Which Memcached Command is used to set the value of Key?
Syntax - set [key] [flags] [exptim] [bytes] [noreply]
Example - set key 0 900 4

Which Memcached Command is used to show the Stats?
stats

Which Memcached Command is used to delete the Key?
delete key

Which Memcached Command is used to close the connection?
quit

How would you update Memcached when data changes?
1.      By clearing the cache proactively
2.      By resetting the cache

What conditions cache can’t retain the stored information?
When memory gets allocated for the cache is exhausted:-
1.      When an item from cache gets deleted
2.      When an individual item in the cache gets expired

By Anil Singh | Rating of this article (*****)

Popular posts from this blog

39 Best Object Oriented JavaScript Interview Questions and Answers

Most Popular 37 Key Questions for JavaScript Interviews. What is Object in JavaScript? What is the Prototype object in JavaScript and how it is used? What is "this"? What is its value? Explain why "self" is needed instead of "this". What is a Closure and why are they so useful to us? Explain how to write class methods vs. instance methods. Can you explain the difference between == and ===? Can you explain the difference between call and apply? Explain why Asynchronous code is important in JavaScript? Can you please tell me a story about JavaScript performance problems? Tell me your JavaScript Naming Convention? How do you define a class and its constructor? What is Hoisted in JavaScript? What is function overloadin

List of Countries, Nationalities and their Code In Excel File

Download JSON file for this List - Click on JSON file    Countries List, Nationalities and Code Excel ID Country Country Code Nationality Person 1 UNITED KINGDOM GB British a Briton 2 ARGENTINA AR Argentinian an Argentinian 3 AUSTRALIA AU Australian an Australian 4 BAHAMAS BS Bahamian a Bahamian 5 BELGIUM BE Belgian a Belgian 6 BRAZIL BR Brazilian a Brazilian 7 CANADA CA Canadian a Canadian 8 CHINA CN Chinese a Chinese 9 COLOMBIA CO Colombian a Colombian 10 CUBA CU Cuban a Cuban 11 DOMINICAN REPUBLIC DO Dominican a Dominican 12 ECUADOR EC Ecuadorean an Ecuadorean 13 EL SALVADOR

25 Best Vue.js 2 Interview Questions and Answers

What Is Vue.js? The Vue.js is a progressive JavaScript framework and used to building the interactive user interfaces and also it’s focused on the view layer only (front end). The Vue.js is easy to integrate with other libraries and others existing projects. Vue.js is very popular for Single Page Applications developments. The Vue.js is lighter, smaller in size and so faster. It also supports the MVVM ( Model-View-ViewModel ) pattern. The Vue.js is supporting to multiple Components and libraries like - ü   Tables and data grids ü   Notifications ü   Loader ü   Calendar ü   Display time, date and age ü   Progress Bar ü   Tooltip ü   Overlay ü   Icons ü   Menu ü   Charts ü   Map ü   Pdf viewer ü   And so on The Vue.js was developed by “ Evan You ”, an Ex Google software engineer. The latest version is Vue.js 2. The Vue.js 2 is very similar to Angular because Evan You was inspired by Angular and the Vue.js 2 components looks like -

nullinjectorerror no provider for httpclient angular 17

In Angular 17 where the standalone true option is set by default, the app.config.ts file is generated in src/app/ and provideHttpClient(). We can be added to the list of providers in app.config.ts Step 1:   To provide HttpClient in a standalone app we could do this in the app.config.ts file, app.config.ts: import { ApplicationConfig } from '@angular/core'; import { provideRouter } from '@angular/router'; import { routes } from './app.routes'; import { provideClientHydration } from '@angular/platform-browser'; //This (provideHttpClient) will help us to resolve the issue  import {provideHttpClient} from '@angular/common/http'; export const appConfig: ApplicationConfig = {   providers: [ provideRouter(routes),  provideClientHydration(), provideHttpClient ()      ] }; The appConfig const is used in the main.ts file, see the code, main.ts : import { bootstrapApplication } from '@angular/platform-browser'; import { appConfig } from '

React | Encryption and Decryption Data/Text using CryptoJs

To encrypt and decrypt data, simply use encrypt () and decrypt () function from an instance of crypto-js. Node.js (Install) Requirements: 1.       Node.js 2.       npm (Node.js package manager) 3.       npm install crypto-js npm   install   crypto - js Usage - Step 1 - Import var   CryptoJS  =  require ( "crypto-js" ); Step 2 - Encrypt    // Encrypt    var   ciphertext  =  CryptoJS . AES . encrypt ( JSON . stringify ( data ),  'my-secret-key@123' ). toString (); Step 3 -Decrypt    // Decrypt    var   bytes  =  CryptoJS . AES . decrypt ( ciphertext ,  'my-secret-key@123' );    var   decryptedData  =  JSON . parse ( bytes . toString ( CryptoJS . enc . Utf8 )); As an Example,   import   React   from   'react' ; import   './App.css' ; //Including all libraries, for access to extra methods. var   CryptoJS  =  require ( "crypto-js" ); function   App () {    var   data