Hi,

I am getting errors when sharing a database between two applications on two
different Pc's.
Sometimes I am getting error "DB_LOCK->lock_put: Lock is no longer valid".
Even when there is no error, changes made in one application are not
readable from the other application.

Berkeley DB 4.2.52: (December 3, 2003) using C interface compiled with MS
Visual C 6.0, running under Windows 2000 sp4.

The application is a windows multi-threaded program that needs to run two
instances of the program on two separate PC's under windows. Both
application instances need multiple-reader/multiple-writer access. I use
the following flags with DBENV->open():
flags =
DB_INIT_MPOOL |
DB_INIT_LOG |
DB_INIT_TXN |
DB_INIT_LOCK |
DB_THREAD |
DB_CREATE;

The application runs fine under heavy load when not sharing the database.

Dan

Hi Dan,

It sounds like you are sharing the databases by having the environment
directory on a Windows network share. Unfortunately, if that is the
case, it is likely that mutexes are not working correctly:

http://www.sleepycat.com/docs/ref/env/remote.html

If you need multi-threaded read-write access from more than one system,
you will need to implement some kind of network communication, such as
DCOM or .NET remoting.

Regards,
Michael.