Oracle tables and index segregation

What are the I/O benefits of segregating Oracle tables and indexes onto separate disk spindles?  This is a "big" question because it touches Oracle DBA best practices, Simplified DBA management, and Oracle performance reporting.  There are many misunderstanding and myths, and this topic deserved an in-depth answer.

The perils of very-large Oracle disks has made it increasing difficult, and why disk contention is unavoidable because of the limitations of the ancient 50 year-old technology which relies on metal platters coated with magnetic media.  The speed of super-large Oracle disks (over 500 gig) are constrained by the speed of the read-write heads and platter RPM (today's platters cannot spin faster because they become aerodynamic).

Myths about separating tables and indexes

With all of the layers that we see within Oracle I/O sub-systems, it's no wonder that many myths have arisen. A few years ago, someone even published that the whole concept of reducing I/O contention by segregating tables and index on separate physical devices was a myth.

Click below to read more about separating Oracle indexes and tables:

For complete details on Oracle I/O management, see my book "Oracle Tuning: The Definitive Reference":


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