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Oracle Indexes

The CPU Costing Model – A Few Thoughts Part II

As previously discussed, the formula used by the CBO using the CPU costing model is basically:
 
(sum of all the single block I/Os x average wait time for a single block I/O +
 sum of all the multiblock I/Os x average wait time for a multiblock I/O +
 sum of all the required CPU cycles / CPU cycles per second)
/
average [...]

2 Year Anniversary !!

A little anniversary slipped by unnoticed this past weekend. Which isn’t really too surprising considering how busy things have been lately, with Christmas just around the corner.
I’ve now been at this blogging lark for 2 whole years !!
Hopefully, there are a few people out there just that little bit wiser now regarding how indexes work [...]