Memcached

Memcached is a high-performance, distributed memory caching system that provides in-memory caching to reduce database load and speed up responses.

No. Memcached stores data in memory, so cached data is lost on restart.

Memcached system uses the slab instead of the item-by-item memory allocation. As a result it improves the usage of the memory and protects it from the fragmentation in case the data expires from the cache. Refer to the Memcached Memory Allocation guide for details.

Yes. Memcached can be used for sessions replication across multiple nodes in a cluster, providing a shared session store for applications. Refer to the Sessions Replication via Memcached guide for an example.