How to calculate the size and number of nodes in the btree?

I need to determine the size of the btree nodes in the log file and the how many internal and leaf nodes in the btree. For example if I have 2.88M records approximately how much disk space is used up by the JE's internal structures? This info will help me determine the best size of the data records.

Chad,
Keys are stored in order in the btree. They are ordered by the custom comparator if one is used, otherwise by the default (unsigned byte) comparator.
Key prefixing (when it is available -- remember that we're talking about a future feature here) reduces memory and disk space for the adjacent keys in a Btree node when the initial bytes of those keys are in common.
If your keys that are adjacent (according to your custom comparator) don't have common bytes at the front, then key prefixing won't have any advantage.
--mark

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