Memcached vs Redis

Popular interview question - what are the differences between Redis and Memcached?

The diagram above illustrates the key differences. The advantages of data structures make Redis a good choice for:

• • Recording the number of clicks and comments for each post (hash)

• • Sorting the commented user list and deduping the users (zset)

• • Caching user behavior history and filtering malicious behaviors (zset, hash)

• • Storing boolean information of extremely large data into small space. For example, login status, membership status. (bitmap)