Why can't I use the same db4o file from multiple connections?

Question

I'm just connecting to a db4o database file from 2 different connections with the LockDatabaseFile=false configuration value.

When I store an object from an IObjectContainer, I'm unable to get that object from the other IObjectContainer at the same time. I commit the transaction after Store but still I'm unable to get that object immediately from the other active IObjectContainer.

What is the problem?

Answer 1

db4o is not designed to allow opening a database file in write mode multiple times. With what you are doing you will corrupt the database file. Please use Client/Server mode instead.

Answer 2

First, let me say that this option is dangerous. It allows two (or more) applications to change the db file at the same time: corruption almost guaranteed.

If I understood it correctly, you have 2 'client' applications that opens the database (using OpenFile()), right?

Have you tried to use CS mode?

How are you checking the object existence? Using a query? (how your query looks like?)

How does your configuration looks like?

Best