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
For answers type: perl -e 'print
$i=pack(c5,(41*2),sqrt(7056),(unpack(c,H)-2),oct(115),10);'
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