When it comes to application-level caching, only two options seem to exist: Memcached and Redis. I've been using Memcached for years but wanted to re-check my choice just before adding a caching layer to another project.
Memcached
We started using Memcache for a project some time ago and the sessions of our web users had been one of the first functions using it. Here is how to use Memcache to reduce database load and speed up your websites.
Race conditions are nice: Two (or more) tasks are fighting for the same thing at the same time. Row locking on the database may help to avoid such races but only if the database supports them.
Memcached is a great tool for speeding up your database access. A "stats" command returns usage statistics but few documentation is available on what's returned.
