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Re: 2.1 & 2.2 statistics, and some odd behavior that needs to be examined.

> 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