hello,

what is the most fastest isolation level ?
i know the behavior of each, but i need to know the difference in speed / resource usage between each of them ...

isc_tpb_concurrency
isc_tpb_consistency
isc_tpb_read_committed + isc_tpb_rec_version
isc_tpb_read_committed + isc_tpb_no_rec_version

thanks by advance