Memcached With Queries Help

[eluser]Dregond Rahl[/eluser]
[quote author="Eric Barnes" date="1297647854"]Greg Aker just wrote a post about this - http://www.gregaker.net/2011/feb/12/code...g_drivers/

That should help you out.[/quote]

Thanks for the link I understand how how its saved, what about updating the cache? in the example the time out is 300 seconds. If expiration isn't set and its left to memcached to handle updating its data. Does it do it automatically? or there has to be an expiration for it to work right?