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{{AfDM|page=Constant Data Base|date=2007 June 21|substed=yes}}
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{{notability|date=October 2006}}
A '''Constant Database''' (or CDB) is a database intended to be read many times but only written to once. [[Dan Bernstein]] created a constant database specification and programs to utilize it on [[Unix]] systems, refer to his [http://cr.yp.to/cdb.html his CDB page].
CDBs are very commonly used in mail systems such as [[Qmail]].
[[Michael Tokarev]] has created an implementation called [http://www.corpit.ru/mjt/tinycdb.html TinyCDB] that can be used with the [[Postfix (software)|Postfix]] MTA.
