README

mcdb - fast, reliable, simple code to create and read constant databases

README  - summary (this file)
INSTALL - quick installation 
COPYING - copyright/license
NOTES   - technical details (if interested)

t/PERFORMANCE - performance notes

mcdb (mmap constant database) is originally based on the cdb package, a:
"fast, reliable, simple package for creating and reading constant databases."
mcdb is almost 33% faster, provides support for use in threaded programs, and
supports databases larger than 4 GB.

nss_mcdb is an nss implementation of standard authentication and netdb files
built as mcdb databases, which are faster than using nscd.  

https://github.com/gstrauss/mcdb/ provides the latest information about mcdb.
http://cr.yp.to/cdb.html provides information about cdb, on which mcdb is based.