Re: Why "Separating Data and Indexes improves performance" is a myth?

From: Daniel Fink <Daniel.Fink_at_Sun.COM>
Date: Fri, 23 Apr 2004 13:51:02 -0600
Message-id: <408973A6.8FF781A0@sun.com>

Paula,

There are many factors to consider in disk layout. You also have to consider recoverability. One place I worked had an antiquated backup system that could only backup devices and not files. For a data warehouse, we separated the read-only tablespaces onto separate devices so we could skip backing them up (except after the load of course). You also have to consider administration. A hosting company wanted to put the database on a system with 3 different sets of disk with different raid levels. For a low performance database with poor sizing forecasts, it was better to have everything on a system with 1 raid (0+1) configuration.

Daniel

Paula_Stankus_at_doh.state.fl.us wrote:

> So in laying out disks for a new database - perhaps the only thing worth =
> separate out is the redo based on I/O contention - right? =20

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Received on Fri Apr 23 2004 - 15:21:32 CDT