Memcached Interview Questions & Answers (2025)

Memcached is a memory caching system used to optimize dynamic database-driven webpages by caching data in RAM to minimize the memory calls to external data. It is free and open-source software, licensed under the Revised BSD license, and runs on Unix-like operating systems and on Microsoft Windows and also, it depends on the lib-event library. Memcached's APIs supply a very huge hash table distributed across various machines and when the table is full, subsequent inserts cause older data to be purged in the least recently used (LRU) order in addition to that, applications using Memcached typically layer requests and additions into RAM before falling back on a slower backing store.

Start Reading Practice Questions

Questions

5 min

Avg Read Time

95%

Success Rate

2022

Updated

Quick Actions

Memcached Interview Questions Practice Test Memcached Interview Questions MCQ

Memcached Interview Questions Interview Preparation Guide

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

Interview Tip

In Memcached Interview Questions interviews, it's important to clearly explain key concepts and demonstrate your coding skills in real-time. Practice articulating your thought process while solving problems, as interviewers value both your technical ability and how you approach challenges.

Our team has carefully curated a comprehensive collection of the top Memcached Interview Questions to help you confidently prepare, impress your interviewers, and land your dream job.

Memcached Interview Questions for Freshers

1 What is Memcached?

Memcached is an open-source, high-performance, distributed memory object that speeds-up data-driven websites by caching data and objects in RAM. It is an element that helps in storing data for 1 /6/12 hours or 1 day etc. it lets you integrate with your applications to procure increased performances.

2 What is the language of Memcached and who is the author?

Memcached is written in C language and the author of the same is Danga Interactive.

3 How do Memcached works?

Memcached works in simultaneous ways:

Gets the details of the user, browser by sending the request to an application
Application calls for the Memcached for a particular user
If Result is found in Memcached, Return the result from Memcached
If no Result is found in Not Memcached, the Application send the request to the database and saves the same in Memcached.
Each Memcached have one unique key
On the behalf of the key Get/Set the data works
Allows you to delete one or more keys
Allows you to assign tags to one or more keys

4 What is the best use of Memcached?

The best uses of Memcached are:

Easy to install in Windows and Unix operating system
All the major languages like Java, PHP, C/C++, Python, Ruby, Perl etc are provided by Memcached for API integration
Enhances the performance of web application by caching
Reduced the burden of a database server
Aids to delete one of more vales
Aids to update the values of keys

5 In what conditions cache cannot retain the stored information?

In the following conditions, a cache cannot retain stored information:
When memory gets allocated for the cache is exhausted

When an item from cache gets deleted
When an individual item in the cache gets expired

6 Which fields of websites and services are favorable for the usage of Memcached?

Memcached can be used for :

All social networking sites for profile caching
Content aggregation i.e. HTML/Page caching
E-commerce websites for HTML and Session caching
Location-based services for database query scaling
Gaming and entertainment services for session caching
Used for tracking cookies/ profile for ad targeting

7 What are the demerits of Memcached?

The limitations of Memcached are:

Cannot store data patiently and permanently
It is not a database
Cannot cache large objects
It is not an application specific
It is not fault-tolerant or highly available

8 When was the initial version of Memcached first launched?

The initial version of Memcached is launched on May 22, 2003.

9 Is there a possibility to share a single instance of Memcache between multiple projects?

Yes, because Memcache is a memory that stores space and it can be run on one or more servers. It also allows you to run two different Memcache processes on the same hosts even though they are independent.

10 What happens to the data stored in Memcached when a server is automatically shut down?

When the data stored in Memcached and the server gets shut down accidentally, the data is already not permanently stored. It is not a prolong data, whatever happens, the data gets deleted in Memcached.

Ready to Master JavaScript Interviews?

Practice with our interactive coding challenges and MCQ tests to boost your confidence and land your dream JavaScript developer job.

Start Practicing Take MCQ Test