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Don Burleson Blog 







Sheila Jenkins

Oracle News Headlines


The Truth Behind Oracle MythsSeptember 29, 2004

In this excellent article, Don Burleson notes the truth behind several long-time Oracle myths:
Some of the common Oracle myths are exposed along with a historical rationale for how they became myths.
Several other Oracle false myths are exposed.  Most notably, Burleson gives reason why periodic index rebuilding might be acceptable:

- Index rebuilds are low risk

- Index rebuilds are unobtrusive

- Index rebuilds are cheap

Here is a list of the myths addressed in this article:


- Old Oracle Myth: Tables perform best when in a single extent

- Old Oracle Myth: In the Data Buffer Hit Ratio (DBHR) falls below 90 percent, we must add more db_block_buffers

- New Oracle Myth - Ratio-based Oracle tuning is meaningless

- New Oracle Myth: Index rebuilding requires careful analysis

- New Oracle Myth: Wait Event Analysis is the best way to tune Oracle


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