Comments on: Outer Joins are Evil http://www.nodroidsallowed.com/2007/12/18/outer-joins-are-evil/ Practical techniques for raising a well-adjusted database Tue, 17 Jan 2012 12:33:02 +0000 hourly 1 http://wordpress.org/?v=3.1.3 By: vdibart http://www.nodroidsallowed.com/2007/12/18/outer-joins-are-evil/comment-page-1/#comment-10 vdibart Fri, 21 Dec 2007 22:57:30 +0000 http://www.nodroidsallowed.com/?p=9#comment-10 I would argue that if you have so many user-driven writes executing that it's affecting batch updates you may have to consider a redesign anyway. The typical web application is about 85% to 95% reads, so it would be very unusual to have that many user-driven writes. What I'm getting at is that in most cases leaning on the 1:1 table design in hopes that it will improve performance is little more than the work of an overzealous DBA trying to find the "ideal" data model. No comment on what this implies about my old friend NetComrade. I would argue that if you have so many user-driven writes executing that it’s affecting batch updates you may have to consider a redesign anyway. The typical web application is about 85% to 95% reads, so it would be very unusual to have that many user-driven writes.

What I’m getting at is that in most cases leaning on the 1:1 table design in hopes that it will improve performance is little more than the work of an overzealous DBA trying to find the “ideal” data model. No comment on what this implies about my old friend NetComrade.

]]> By: NetComrade http://www.nodroidsallowed.com/2007/12/18/outer-joins-are-evil/comment-page-1/#comment-9 NetComrade Fri, 21 Dec 2007 22:34:49 +0000 http://www.nodroidsallowed.com/?p=9#comment-9 Until there is column-level locking in Oracle, 1:1 tables are unavoidable to allow batch updates and user updates to happen at the same time, in your case for users and user_details. But yes, outer joins are evil. Until there is column-level locking in Oracle, 1:1 tables are unavoidable to allow batch updates and user updates to happen at the same time, in your case for users and user_details.

But yes, outer joins are evil.

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