A. These are stored only in memory-cache. Certain HTTP documents are marked specifically not to be stored in local caches. These are listed above in Q2. However, to improve performance when reloaded only by the front end, they are stored in memory caches. In general, documents are stored preferentially in disk cache and not memory.
Memory is used when disk is unavailable.
A. Depending upon the cache restrictions on the cache item, it will be added either to the disk or to the memory cache. Only exception to this rule is when the object is set as a StreamAsFile for a plugin. A. Certain images are transferred over the internet in a compressed manner. These are decompressed for faster layout and hence are stored in a decompressed cache held in memory. To see your memory cache.