DBase File locking issues

Matthew Vanecek mev0003 at unt.edu
Thu Sep 16 01:08:29 GMT 1999

Are you sure it's not a problem rather with the DBase engine failing to
lock the records properly, for whatever reason?  That's how FoxPro
works, anyhow, where the files live on a Novell share, and FoxPro isn't
all that different from DBase (or, didn't used to be, anyhow).

Jim Morris wrote:
> Hi All,
> I am experiencing issues with the use of DBase files on a Samba 2.0.5a
> share, that appear to be due to locking problems.  Basically, I have
> test programs for both DOS and Win32 that does nothing but append
> records to a DBase database (DBF/MDX files).  If more than one client
> PC is appending to this file, data loss occurs.  I get random data
> loss, with records lost, and index file corruption too.  I.e. I find
> records that were supposedly added that are simply missing, and other
> records that have multiple index file entries pointing to one physical
> record - and the record contains only the data from one PC of course.
> FYI, I've written the test apps using several different methods of
> DBase access - CodeBase 5.1 for DOS and Win32, as well as Borland
> C++ Builder 4.0 and the "Borland Database Engine".
> The problem ONLY seems to occur when two clients systems are WRITING
> to the database at the same time. I can have one reading from, while
> another writes to the database, and not see the problem.
> I've tried turning STRICT LOCKING on, and OPLOCKS off, to no avail.
> I found references in the Samba mailing list archives to a Redhat 6.0
> GLIBC locking bug.  The two Samba servers I've seen the problem on are
> both running Redhat 6.0, with all the latest updates applied.  I built
> the Samba 2.0.5a RPM's myself, using the samba-2.0.5a.tar.gz source.
> So my question is:  is this locking bug in the Redhat C libraries
> fixed in Samba 2.0.5a, or do I need to do something to upgrade my C
> libraries?  Or is something else going on?
> Thanks!
>  --
> /------------------------------------------------\
> | Jim Morris  | Business:  jmorris at rtc-group.com |
> |             | Personal:  Jim at Morris.net        |
> |------------------------------------------------|
> |    World Wide Web:  http://Jim.Morris.net      |
> |       AOL Instant Messenger:  JFM2001          |
> \------------------------------------------------/

Matthew Vanecek
Course of Study: http://www.unt.edu/bcis
Visit my Website at http://people.unt.edu/~mev0003
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