http://jonathanlewis.wordpress.com/2006/11/08/subquery-selectivity/ Just another Oracle weblog Sat, 18 May 2013 11:04:10 +0000 hourly 1 http://wordpress.com/ http://jonathanlewis.wordpress.com/2006/11/08/subquery-selectivity/#comment-39206 Mon, 17 Jan 2011 18:39:45 +0000 http://jonathanlewis.wordpress.com/2006/11/08/subquery-selectivity/#comment-39206 [...] an item I thought I’d published a few years ago as a follow-up to an article on a 10g bug-fix for subquery selectivity. I was reminded of my oversight when a question came up on OTN that looked [...]

]]> http://jonathanlewis.wordpress.com/2006/11/08/subquery-selectivity/#comment-35462 Thu, 11 Feb 2010 08:13:16 +0000 http://jonathanlewis.wordpress.com/2006/11/08/subquery-selectivity/#comment-35462 [...] of posts already; and shown how useful it can be in two examples: understanding a problem with filter subquery selectivity and understanding why some Cartesian merge joins were appearing [...]

]]> http://jonathanlewis.wordpress.com/2006/11/08/subquery-selectivity/#comment-35005 Wed, 16 Dec 2009 21:20:03 +0000 http://jonathanlewis.wordpress.com/2006/11/08/subquery-selectivity/#comment-35005 This is a good tip….

]]> http://jonathanlewis.wordpress.com/2006/11/08/subquery-selectivity/#comment-14181 Tue, 03 Jul 2007 18:11:16 +0000 http://jonathanlewis.wordpress.com/2006/11/08/subquery-selectivity/#comment-14181 I just beat my head against the wall for a couple days last week trying to tune and EXISTS subquery just like this in 9i. Great explanation, thanks!

]]> http://jonathanlewis.wordpress.com/2006/11/08/subquery-selectivity/#comment-109 Wed, 08 Nov 2006 19:12:03 +0000 http://jonathanlewis.wordpress.com/2006/11/08/subquery-selectivity/#comment-109 Excellent! We use many “exists” subqueries where I work and the cost calculations have never made sense. Now I know why, and we can respond appropriately.

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