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From: ed@mtxinu.UUCP (Ed Gould)
Newsgroups: net.wanted,net.database,net.unix-wizards
Subject: Re: Database software for UNIX systems
Message-ID: <509@mtxinu.UUCP>
Date: Tue, 28-Jan-86 13:33:43 EST
Article-I.D.: mtxinu.509
Posted: Tue Jan 28 13:33:43 1986
Date-Received: Fri, 31-Jan-86 23:55:38 EST
References: <426@godot.UUCP> <164@hscfvax.UUCP> <131@wgivax.UUCP> <1133@ptsfa.UUCP>
Reply-To: ed@mtxinu.UUCP (Ed Gould)
Organization: mt Xinu, Berkeley, CA
Lines: 17
Xref: watmath net.wanted:8037 net.database:198 net.unix-wizards:16587

>> ...  Ingres also requires mods to the kernel... 
>
>Actually, Ingres has a locking pseuodo device driver. I do not think that
>adding a "device" driver is equivalent to "mods to the kernel" since you
>are not changing kernel source code.

There are several versions of Ingres.  The current commercial version
from RTI does not require kernel mods, although older versions did.
The current mechanism just adds a driver.  Research Ingres, running
on 4.2/4.3BSD uses a user-level lock manager that communicates with
the database software via a socket.

-- 
Ed Gould                    mt Xinu, 2910 Seventh St., Berkeley, CA  94710  USA
{ucbvax,decvax}!mtxinu!ed   +1 415 644 0146

"A man of quality is not threatened by a woman of equality."