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Home / Interview Subjects / Memcached
WithoutBook LIVE Mock Interviews Memcached Related interview subjects: 74

Interview Questions and Answers

Know the top Memcached interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Total 28 questions Interview Questions and Answers

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Know the top Memcached interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Freshers / Beginner level questions & answers

Ques 5

How can you add or update a value in Memcached?

You can add or update a value in Memcached using the 'set' command. If the key already exists, it will be updated; otherwise, a new key-value pair will be created.
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Intermediate / 1 to 5 years experienced level questions & answers

Ques 11

Explain how Memcached works.

Memcached stores key-value pairs in memory to reduce the need for repeated database queries. It uses a simple and efficient hashing algorithm for distributed caching across multiple servers.
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Ques 12

How does Memcached handle data expiration?

Memcached uses a time-based expiration mechanism. Each key-value pair has a specified expiration time, and once the time is reached, the data is automatically evicted from the cache.
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Ques 13

Explain the concept of Memcached slab allocation.

Memcached uses slab allocation to efficiently manage memory. It categorizes memory into slabs based on size, and each slab contains items of a specific size range.
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Ques 14

Explain Memcached CAS (Check and Set) operation.

CAS is a mechanism in Memcached that allows for atomic updates. It checks if the value has been modified since it was retrieved, and updates it only if no changes occurred in the meantime.
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Ques 15

Explain Memcached slabs and classes.

Memcached slabs represent chunks of memory allocated for items, and classes are sets of slabs with similar-sized items. Slabs are organized into classes to efficiently manage memory usage.
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Ques 18

What is the Memcached LRU algorithm?

LRU (Least Recently Used) is a caching eviction algorithm used by Memcached to remove the least recently accessed items from the cache when it reaches its memory limit.
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Ques 19

How can you monitor Memcached performance?

Memcached performance can be monitored using tools like memcached-tool, telnet, or specialized monitoring software. Key metrics include hit rate, miss rate, and memory usage.
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Ques 20

Explain Memcached connection pooling.

Memcached connection pooling involves reusing existing connections instead of creating new ones for each request. This helps reduce overhead and improve performance.
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Ques 22

What is Memcached key hashing?

Memcached uses a consistent hashing algorithm to determine the server responsible for a particular key. This ensures even distribution of keys across multiple servers.
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Ques 23

Explain Memcached slab growth factor.

The slab growth factor in Memcached determines how much the memory allocation size should grow when the existing slabs are full. It helps in efficient memory management.
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Experienced / Expert level questions & answers

Ques 24

What is the difference between Memcached and Redis?

While both are caching systems, Memcached is a simple key-value store, and Redis is a more feature-rich data store with support for data structures like sets and lists.
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Ques 25

How does Memcached handle network partitions?

Memcached does not handle network partitions by default. Developers need to implement their own mechanisms, such as sharding and replication, to address network partition issues.
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Ques 26

How can you handle cache stampede in Memcached?

Cache stampede can be mitigated using techniques like setting short expiration times, implementing mutexes, or using lazy loading to refresh the cache.
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Ques 27

How can you secure Memcached servers?

Memcached servers can be secured by setting up firewall rules, using SASL (Simple Authentication and Security Layer), and configuring access controls to restrict unauthorized access.
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