Redis is a big collection of data structures that are held in memory and flushed to disk every so often.
$ SET <key> # set key, update if already exists $ GET <key> # get key $ DEL <key> # delete key
Expire keys time out after a specified value. IMO it's best to set it in ms rather than seconds to keep compat with unix.
$ PSETEX <key> <timeout> <value> # set an expiry key in milliseconds $ SETEX <key> <timeout> <value> # set an expiry key in seconds