On Sun, 2006-12-10 at 14:57 -0500, Tom Lane wrote: > Comments in general? I'm a bit worried that these changes will bias > us > against indexscans too much, but there's no sign of that in Arjen's > results.
Are Arjen's tests on prepared queries? Does that change anything? We shy away from indexes on prepared queries too much already, important when the consequence of doing so is an O(N) seqscan rather than an O(logN) indexscan. The cost of initiating an index scan is a cause for concern, but it seems reasonable to get it accurate. I'd like to perform some of that work at planning time, not at scan time, when it is possible for us to do so. Simple indexed, planned queries shouldn't need to pay that cost repeatedly. -- Simon Riggs EnterpriseDB http://www.enterprisedb.com ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
