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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.

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The Best LIVE Mock Interview - You should go through before interview

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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Intermediate / 1 to 5 years experienced level questions & answers

Ques 1

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 2

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 3

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 4

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 5

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 8

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 9

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 10

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 12

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 13

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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