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  Oracle Tips by Burleson

The shift in Oracle bottlenecks

The dramatic decrease in the cost of RAM is radically changing the Oracle database architecture. In 2005, 100 gigabytes of SSD (i.e. Texas Memory Systems) can be obtained for about $150,000.

Historically, RAM has been a scarce and expensive resource, and the DBA was challenged to find the data that was referenced most frequently to cache on precious RAM media.

This new age of cheap solid state disks has meant a dramatic change in Oracle database architecture, as the old fashioned model of disk-based data management is being abandoned in favor of a cache-based I/O approach.

For years, storage architects have observed the growing divide between processor performance and storage access times. Remember, when the CPU waits on storage, the users are waiting on storage.

According to a whitepaper by James Morle, SSD is great for high-bandwidth I/O components such as Oracle redo logs. The Oracle redo logs archive the row before images and they are used for data recovery in the event of a disk crash. Morle notes:

“This is where SSD can help out. By deploying a single SSD, all redo logs can be located away from the RAID 1+0 array, whilst providing low latency writes and high bandwidth reads (for archiving).”


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

http://www.rampant-books.com/book_2005_2_rac_ssd_tuning.htm  

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