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When is setting OPTIMIZER_INDEX_COST_ADJ appropriate?

The initialization parameter OPTIMIZER_INDEX_COST_ADJ has a certain popularity in the area of Oracle Database Performance Tuning. Especially, it can be used to make the Optimizer favor index access instead of full table scans. But that is not necessarily appropriate – in fact it can have very counterproductive effects on performance. Richard Foote has some very instructive postings about this, especially this one is impressive, in my view.

This entry was posted on July 22, 2009, 14:24 and is filed under TOI. You can follow any responses to this entry through RSS 2.0. You can leave a response, or trackback from your own site.

  1. #1 by bernardino on August 26, 2014 - 23:26

    buenas articulos

  2. #2 by Nassou on August 23, 2016 - 17:20

    I agree, and especially perfectly detailed and explained with consistency.

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