strange exclusive lock in relation --- ideas

hello all,

i came with a strange finding the other day and i would appreciate any ideas
on the matter (if any). while checking on the locks of the server i found a
tuple indicating that a prepared transaction had requested an exclusive lock
on a relation. in general, i am aware of the situations where an exclusive
lock is requested (alter table, drop, create index, vacuum full ...) but i
would like to know if there are any other cases when an exclusive lock
request could be issued. i have ran many tests since then but didnt manage
to recreate the lock. i used various combinations of concurrent transactions
of inserts,update,deletes using foreign keys and other constraints but with
no use. so, do you have in mind any other situation (beside the obvious ones
mentioned before) when such a lock can be requested? thx in advance

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