Stefan de Konink wrote:

sql>ALTER TABLE relation_members_node ADD CONSTRAINT pk_relation_members_node PRIMARY KEY (relation, idx); 0 tuples !MALException:mkey.bulk_rotate_xor_hash:command failed

Within a transaction I get the previous error. My dataset on disk is now 29GB after switching to oid32 on a 64bit system, 64GB of main memory is available. And the server was started in performance mode.

Niels hinted me that reorder could be the issue. I disabled it, and everything worked. Stefan