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?
http://www.memcached.org/

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

Labels

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

Popular posts from this blog

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 ...
Read more

How To convert JSON Object to String?

To convert JSON Object to String - To convert JSON Object to String in JavaScript using “JSON.stringify()”. Example – let myObject =[ 'A' , 'B' , 'C' , 'D' ] JSON . stringify ( myObject ); ü   Stayed Informed –   Object Oriented JavaScript Interview Questions I hope you are enjoying with this post! Please share with you friends!! Thank you!!!
Read more

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 SALVA...
Read more

Encryption and Decryption Data/Password in Angular

You can use crypto.js to encrypt data. We have used 'crypto-js'.   Follow the below steps, Steps 1 –  Install CryptoJS using below NPM commands in your project directory npm install crypto-js --save npm install @types/crypto-js –save After installing both above commands it looks like  – NPM Command  1 ->   npm install crypto-js --save NPM Command  2 ->   npm install @types/crypto-js --save Steps 2  - Add the script path in “ angular.json ” file. "scripts" : [                "../node_modules/crypto-js/crypto-js.js"               ] Steps 3 –  Create a service class “ EncrDecrService ” for  encrypts and decrypts get/set methods . Import “ CryptoJS ” in the service for using  encrypt and decrypt get/set methods . import  {  Injectable  }  from ...
Read more

Angular Testing Questions and Answers | 9, 8, 7, 6

What Is Testing? The testing is a tools and techniques for a unit and integration testing Angular applications . Why Test? Tests are the best ways to prevent software bugs and defects. How to Setup Test in Angular Project? Angular CLI install everything you need to test an Angular application. This CLI command takes care of Jasmine and karma configuration for you. Run this CLI command- ng test The test file extension must be “.spec.ts” so that tooling can identify the test file. You can also unit test your app using other testing libraries and test runners. Types of Test – The all great developer knows his/her testing tools use. Understanding your tools for testing is essential before diving into writing tests. The Testing depends on your project requirements and the project cost. The types of Testing looks like - 1.       Unit Test 2.       Integration Test 3.       En...
Read more