If I want to share tables between databases (user, spam, whatever), I usually have to consider issues with the primary key sequences. The solution that comes to mind is to share the sequences table as well. It is nice that Drupal offers this flexibility. Is there a way that one can specify "use db1.sequences for node_id sequences, db2.sequences for user_id sequences, and db3.sequences for spam_id sequences"? I don't think so, but this might be a feature we should consider implementing. Why? Because the current system only allows a database to join a shared pool of something (take spam for now) at the beginning of its lifetime. If I had 5 sites sharing spam tables, and wanted to integrate an existing site, I'd be out of luck if I had to rely on a shared, running sequid for the spam tables. I think it would be very useful if one could specify a sequences array like the $db_prefix array: $db_sequences = array( 'node_id' => 'default', 'spam_id' => 'db_spam.', ); This would result in all sequences being taken from the default sequence table except for the (purely illustrational) 'spam_id' sequence, which would be taken from the db_spam.sequences table. Is there a way to do this currently in Drupal that I've overlooked? Would people be in support of this functionality if a patch appeared? cheers, Robert