UNIX-based databases: info request

[Charles Sandel]

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I am posting this for someone with no direct access to
USENET.  Please reply to the address below:
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I need pointers to literature or implementations of
4.2bsd-based database systems built on top of the UNIX
filesystem which are capable of handing some or all of:

	- fast i/o of large numbers of *varying length* records.
	- records sizes from a few bytes to many pages.
	- some provisions for locking.
	- some backup/checkpointing capability. 
	- guarantees of atomicity of transactions.
	- traditional db concerns: verification, authentication, etc.

Any information which anyone can provide about db systems which come
close to fitting these requirements and are available for us
to customize would be greatly appreciated.

Replies to:   egullich%milano at mcc.arpa

Thanks in advance,
	Eric Gullichsen
	MCC-STP

-- 
                     *>> Charles Sandel <<*
            uucp:  {ut-sally, ut-ngp}!utastro!charles
            arpa:  chaz at ut-ngp  or  charles at ut-sally
                      at&t:  (512) 471-4461