Mambo provides a feature through the Global Configuration that allows your site to cache files. Over time, this cache increases in size and needs to be 'cleaned' or flushed to remove old cached files and reduce the size of the cache.
Mambo Cache
The cache makes a useful difference in the number of SQL requests made to a Mambo database. This is most noticeable in relation to access control. By reducing the number of queries, many sites report improvements in performance.
Enabling the cache
You can enable caching by going to "Site" > "Global Configuration" > "Cache".
See also:
Clearing or Cleaning the Mambo Cache
Why do I Need to Clear the Cache?
As database queries are cached, the number of files continues to build. Old cache files build up, taking up your server disk space and over time the performance of the cache reduces. It is good house-keeping to remove them.
How Often do I Need to Clear the Cache?
This depends on how much disk space you have, how many visitors you get (and therefore, how many database queries are generated) and how particular you are about keeping your Mambo site running optimally. Many users make a point of clearing their cache once a month, others do it weekly, some don't do it at all - just do whatever works best for your site.
How do I Clear the Cache?
Login to your Administrator Backend and go to System > Clean Cache on the top horizontal menu. Click on it and your cache will be cleared.