Globals / Cache
The Global / Cache tab contains settings for the
argument, memory and proxy disk cache. The
argument cache is a disk based cache used primarily by the image
generating RXML tags. It is long lived since it is very hard to know how
long clients will request one of the generated images. There is no
automatic system for deleting information from the argument cache, the
system administrator will have to do that manually or create a
cron job to do it.
The memory cache is used for a number of things in Roxen, for
example caching DNS queries, support entries or the cache tag. It is
usually a fairly short lived cache, entries living a number of minutes.
The Status / Cache status task shows information about
how the memory cache is performing. The Maintenance / Flush
caches task lets you clear the memory cache as well as the
data cache.
The proxy disk cache is used by the HTTP proxy module, to store
fetched files on disk. It is a long lived cache with its own garbage
collector that removes old files and makes sure the cache stays within
a certain size.
Apart from these caches there is also a data cache for frequently used
static pages, which is described in the Sites
chapter.
