Hi, I am trying to determine if there is a difference in I/O cost between SPI functions and low level functions like heap_fetch, heap_getnext, etc... I want to decide if there is any merit for using the low level functions instead of the easier SPI. My guess is that they both use the same underlying framework for reading and caching blocks but I can't be sure. Also, is there any significant CPU cost between them? 10x. Regards, tzahi. WARNING TO SPAMMERS: see at http://members.lycos.co.uk/my2nis/spamwarning.html ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to majordomo@xxxxxxxxxxxxxx)