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  Oracle Tips by Burleson

SSD Average Transaction Time

Perhaps the most dramatic difference is in the average transaction time results when comparing the RAID to the SSD system. As expected from a review of the previous SSD results, a decrease in the average transaction time should be expected allowing more transactions and more bytes per second. However, a very dramatic decrease as cache memory was reduced was seen.

Once dependence on the interconnect is mitigated, the transaction times dramatically improved by several orders of magnitude. The scale on the graph in Figure 4.10 is logarithmic. This means that for one increase in scale on the vertical axis, an increase by a factor of 10 can be seen. Compare the average transaction times in Figure 4.10 to those from the RAID tests in Figure 4.6. The dramatic difference between the two technologies can be seen as memory is reduced. This indicates that by utilizing the RamSan400 SSD system transaction times were improved by nearly a factor of 100, two orders of magnitude!


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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