Update stmt on table counts one invalidation in other pll. servers?

Hello,
if I execute an update stmt on a table like this:
UPDATE tab SET usrnm = 'alf' WHERE userid = '123'.
Assume that the same entry already exists!! The table tab already consists of one key field, this is userid and another attribute, this is usrnm. If the UPDATE stmt is executed on the table, is the number of invaldation increased by one? Is this one invalidaiton, also this entry exists already and nothin is "really" updated.
At the moment, I have no possibilty to test this...
any ideas?
thanks, holger

What I mean is:
What happens, if I update a table entry with values that alreay exist?
Normally, each change (UPDATE,INSERT,DELETE) triggers one invalidation. If a table is invalidated or a range of a table or a single entry this is flagged as an invalidation. Thus, the database interface of the affected appplication servers forward queries targeting the invalidated table, table range or table entry to the database./..

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