Comments on: Subquery Selectivity – 2 http://jonathanlewis.wordpress.com/2011/01/17/subquery-selectivity-2/ Just another Oracle weblog Thu, 23 May 2013 12:47:17 +0000 hourly 1 http://wordpress.com/ By: Jonathan Lewis http://jonathanlewis.wordpress.com/2011/01/17/subquery-selectivity-2/#comment-39228 Wed, 19 Jan 2011 10:38:29 +0000 http://jonathanlewis.wordpress.com/?p=5037#comment-39228 Andy,

Thanks for the note.

The behaviour is the same in 10g and 11g. I should have run the tests on 10g for consistency, but happened to use an 11g instance to report the output. I’ve modified the wording in a few places to make this more obvious.

The “=1″ vs. “>1″ is, was a cut-n-paste error; I copied the wrong statement from my test script into the blog. I’ve now corrected that error. (The query with the predicate “1 < (subquery)" would have shown a final cardinality of 50,000 (5%) on pushing).

]]> By: Andy http://jonathanlewis.wordpress.com/2011/01/17/subquery-selectivity-2/#comment-39214 Tue, 18 Jan 2011 08:23:55 +0000 http://jonathanlewis.wordpress.com/?p=5037#comment-39214 Hi Jonathan,

Just a bit of confusion: in your article, you refer to 9i and 10g, but the plans shown are from 9i and 11R2. Maybe you copied the wrong plan?

Also, in the workaround, why is the filter shown as ‘….= 1′ instead of ‘….> 1′ ?

Cheers

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