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  Oracle Tips by Burleson

Older technology can be very dangerous

This concept is important because many enterprises may inadvertently double cache Oracle data. Even more problematic are the fake statistics reported by Oracle when multiple level caches are employed:

  • Fake Physical I/O times: When using a disk array with a built-in RAM cache, the disk I/O subsystem may acknowledge a physical write to Oracle when, in reality, the data has not yet been written to the physical disk spindle. This can skew timing of disk read/write speed.

  • Wasted Oracle Data Buffer RAM: In systems that employ web servers, the Apache front end may cache frequently used data. Hence, significant Oracle resources may be wasted caching data blocks that are already cached on the web server tier.

The above book excerpt is from:

Oracle RAC & Grid Tuning with Solid State Disk
Expert Secrets for High Performance Clustered Grid Computing

ISBN: 0-9761573-5-7
Mike Ault, Donald K. Burleson  

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