Set SCCACHE_MEMCACHED to a Memcached url in format tcp://<hostname>:<port> ... to store the cache in a Memcached instance.
Set SCCACHE_MEMCACHED_EXPIRATION to the default expiration seconds of memcached. The default value is 86400 (1 day) and can up to 2592000 (30 days). Set this value to 0 will disable the expiration. memcached will purge the cache entry while it exceed 30 days or meets LRU rules.