I'm not sure, if this is a detection problem in maxdb:

Two Tables:

create table Father ( id FIXED(19,0) not null, primary key (id))
create table Son ( id FIXED(19,0) not null, primary key (id))

A Constraint between them:

alter table Son foreign key SonFatherFK (id) references Father

Some Data:

insert into Father (id) values (0)
insert into Father (id) values (1)
insert into Son (id) values (0)
insert into Son (id) values (1)



Two Transactions

t1:  delete from Son where id=0 
t2:  delete from Son where id=1 
t2:  delete from Father where id=1
t1:  delete from Father where id=0  

This leads to a deadlock! 

Background:

Father Son is a object hierarchy modelled with Hibernate (Java).
A multi thread app deletes Son1 and Son2. The delete is split into delete of the
son row and the father row, and the scheduler preempts sometimes the first
thread after deleting the son only.

So the question is, is this a deadlock and should be detected by maxdb. Or is
this a behaviour which I must cope with?

Thanks Armin








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