Ndbm
From Infogalactic: the planetary knowledge core
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ndbm (standing for New Database Manager) is a Berkeley produced version from 1986 of the AT&T dbm database.
ndbm stores arbitrary data by use of a single key in fixed-size buckets.
Problems
The sum of the sizes of a key/content pair must not exceed the internal block size (normally between 512 and 4096 bytes). Moreover all key/content pairs that hash together must fit on a single block.