v$sql 'db block changes'

Anybody have a good method for tracking top SQL by 'db block changes'? It seems this statistic is only tracked by session and instance, but not by SQL statement. The 'disk_reads' are tracked in v$sql and although it wouldn't make sense to track 'disk_writes' (since physical writes are performed in the background as needed by DBWR, not as a direct result of any particular SQL statement), it seems like it would make sense to track 'db block changes' by SQL, doesn't it? I've got heavy writes occurring on a RAID 5 system and it's killing performance, but I'm having trouble identifying the offending SQL. Any ideas?  

Thanks,
Brandon

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