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MongoDB / REDIS
Difference between Memcached and REDIS.
| Memcached. | REDIS. |
| Memcached is multi-threaded. | Redis is single threaded. |
| Memcached only does caching information. | Redis does caching information and also supports persistence and replication. |
| Memcached supports the functionality of LRU (Least Recently Used) eviction of values. | Redis does not support the functionality of LRU eviction of values. |
| In Memcached when they overflow memory, the one you have not used recently (LRU- Least Recently Used) will get deleted. | In Redis you can set a time out on everything, when memory is full, it will look at three random keys and deletes the one which is closest to expiry. |
| Memcached supports CAS(Check And Set). It is useful for maintaining cache consistency. | Redis does not support CAS ( Check And Set). |
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