how sql causing an blunder submitchanges linq sql?

i've got linq sql infrequently throws

"cannot insert register pivotal quarrel vigilant 'dbo.table' unparalleled index
'ix_indexname'.the matter terminated."

is there proceed i spin logging during slightest debug datacontext sql being executed during blunder raised?

update: i should have mentioned i know getchangeset() method, i wondering there ability datacontext shows final sql executed, ability sql difference shows sql.

the rare thing blunder change sets, there wholly transform & wholly domain that's changing datetime domain isn't index causing error.