> I have a understanding problem. If I set autocommit to false and
> call the connection.commit() method after about 1000 inserts, is
> this a "hard commit" or commit retaining ?

Commit retaining is not currently used in JayBird, it is
always "hard" commit.

> I use an embedded firebird 1.5 and jaybird and make about 1000
> inserts per minute and the time for insert increase constantly.
> Is this normal behaviour ?

I think there's no JayBird specific issues there. Try to ask in
Firebird-Support, they would probably explain this.

Roman