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Why A Brand New Index Might Benefit From An Immediate Coalesce (One Slip)

A recent question on the OTN Forums Reg: Index – Gathering Statistics vs. Rebuild got me thinking on a scenario not unlike the one raised in the question where a newly populated index might immediately benefit from a coalesce. I’ve previously discussed some of the pertinent concepts such as how index rebuilds can make indexes bigger, not smaller […]

Empty Leaf Blocks After Rollback Part II (Editions of You)

In my last post, I discussed how both 1/2 empty and totally empty leaf blocks can be generated by rolling back a bulk update operation. An important point I made within the comments of the previous post is that almost the exact scenario would have taken place had the transaction committed rather than rolled back. A […]

Index Block Dumps and Index Tree Dumps Part I: (Knock On Wood)

I thought before I jump into a topic that requires looking at a number of index block dumps, it might be worth briefly recapping how one goes about dumping index blocks in Oracle.   A block dump is simply a formatted representation of the contents of a particular Oracle database block.  Although I’ll be focusing [...]