http://jonathanlewis.wordpress.com/2011/03/03/index-rebuilds-4/ Just another Oracle weblog Wed, 22 May 2013 12:40:08 +0000 hourly 1 http://wordpress.com/ http://jonathanlewis.wordpress.com/2011/03/03/index-rebuilds-4/#comment-39945 Thu, 10 Mar 2011 18:16:30 +0000 http://jonathanlewis.wordpress.com/?p=5876#comment-39945 [...] wrote a short note last week that linked to a thread on the Russian Oracle forum about indexing, and if you’ve followed [...]

]]> http://jonathanlewis.wordpress.com/2011/03/03/index-rebuilds-4/#comment-39858 Mon, 07 Mar 2011 07:13:16 +0000 http://jonathanlewis.wordpress.com/?p=5876#comment-39858 Had this on our databases, exactly on “FIFO” tables, i.e. “queue like” tables: insert, process, delete.
Coalesced helped.
Does it sound strange for a well priced database like Oracle? Well, whatever the price you can not beat physics. A bit of underlying theory might help, for example: http://en.wikipedia.org/wiki/B-tree#Access_concurrency
“The cost associated with this improvement is that empty pages cannot be removed from the btree during normal operations.” That’s called engineering. Oracle does exactly that. It optimizes some areas but sacrifices others and … introduces bugs.

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