RAM Based Caching

When the Regular Cache is too full, the old cache items in the Regular Cache are moved to Compressed Cache to leave room for new contents to be cached. When a cache item is found in the Compressed Cache, the cache item is moved back to the Regular Cache.


RAM Based Caching eliminates the latency from reading the cache from hard drives. This latency becomes significant because database traffic is usually smaller packets and on a much more frequent basis. Hard drive caching (used by most WAN Accelerators) is fine when latency is not an issue.


The use of Compressed Cache can increase the size of the cache by 2 to 10 times depending on the compression ratio.

For example, a computer with 256 GB of RAM, where 64 GB is used for regular cache, 192 GB is used for compressed cache and assuming a 4:1 compression ratio, the size of the cache will be 832 GB (64 + (4 X 192)).