The BDB environment (__db.*) is located on disk, rather than in memory.
With the shared memory BDB environment, the BDB memory pool resides in the shared memory, while with the file-backed memory mapping, the BDB memory pool is backed by files. In this sense, it would be more appropriate to use the terminology "file-backed DB caching" / "shared memory DB caching" instead of "disk caching" / "memory caching". - Jong
Okay, so now that we have the semantics nailed down...
--Quanah
-- Quanah Gibson-Mount Principal Software Developer ITSS/TSS/Computing Systems ITSS/TSS/Infrastructure Operations Stanford University GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html