Comments on: used_urec http://jonathanlewis.wordpress.com/2011/09/02/used_urec/ Just another Oracle weblog Wed, 22 May 2013 12:40:08 +0000 hourly 1 http://wordpress.com/ By: Jonathan Lewis http://jonathanlewis.wordpress.com/2011/09/02/used_urec/#comment-41612 Fri, 02 Sep 2011 17:43:52 +0000 http://jonathanlewis.wordpress.com/?p=7085#comment-41612 That’s a good question – I’d have to test it, but the first question is “incease it relative to what?”

Logically it shouldn’t make any difference to (at least some of) the possible insert operations because undo and redo are logical change descriptions, so the physical location shouldn’t make any difference.

There might be some cases where inserting a row causes heap block compression and introduces some new tokens (that’s just thinking aloud, at the moment) and that would make that could make that row insert more expensive.

]]> By: Wilton Businessman http://jonathanlewis.wordpress.com/2011/09/02/used_urec/#comment-41611 Fri, 02 Sep 2011 17:29:52 +0000 http://jonathanlewis.wordpress.com/?p=7085#comment-41611 Doesn’t the 11g “compress for OLTP” introduce increased UNDO too?

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