in the nightly maintenance job, the update statistics failed.
specifically on one table.. and Error: 5242 was reported.
this is the second time the same error has happened as part of the UPDATE STATISITICS step in one week (it runs every night).
i ran the update statistics now manually on both tables and they worked fine:
(syntax: UPDATE STATISTICS <tablename> WITH FULLSCAN) )
running DBCC checkdb now returns no error.
suggests it is surely data corruption.
if it is, why would they work now fine, when run manually?