>    How is subj supposed to work? I see that it forces engine to start a 
> transaction and that's all.

It maintains all the rdb$db_key values for the length of a connection - i.e.
they are not allowed to change. An internal transaction gets started for this.
It was introduced to support Cognos' Powerhouse 4GL product which made 
extensive 
use of db_keys.

Obviously it can have issues re. garbage collection...

Regards
Paul


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