Does sdbm really "re-hash (my) key into an internal key."?? The data I am hashing is about 300bytes and I did the hashing to reduce data while getting a (quite) unique key... My understanding was that sdbm would 1:1 use the supplied data as key, but if it really hashes it - I would revert to feeding it the original.. Are you sure?

How could it implement a hash table without hashing the keys? I'm no SDBM expert, but this leads me to believe my guess is correct:

http://www.partow.net/programming/hashfunctions/#SDBMHashFunction

I can't answer your more specific performance questions. I doubt anyone can, with the possible exception of the people who wrote SDBM. I suggest you setup some benchmarks and try it!

-sam

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