I'm looking for a simple answer to a simple question that is hard to search for.
Does memcache support purging a subset of keys? Or is a purge call always going to flush the entire cache?
More specifically, does PHP's memcached ("d" on the end) client support this? (vs PHP's memcache client, which does not) Does it require support of this on the server?
We have a multi-tenant service that uses a single memcache server for all tenants. To do this, we prefix keys with a unique tenant identifier. We'd like to be able to flush keys per-tenant, but it looks like memcache's purge only supports purging the entire cache.