Exadata Technical Overview - Oracle
Exadata Technical Overview - Oracle
Exadata Technical Overview - Oracle
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39<br />
<strong>Exadata</strong> Smart Flash Log<br />
� Accelerate Transaction Response Times Using Flash<br />
Default (on left)<br />
- Choppy Response<br />
- High Outliers<br />
Smart Flash Log<br />
- 3x faster response<br />
- Much lower outliers<br />
Automatic and<br />
Transparent<br />
Copyright © 2012, <strong>Oracle</strong> and/or its affiliates. All rights reserved.<br />
� Uses Flash for Database Logs in a clever way<br />
Transaction<br />
Response Times<br />
Smart Flash Log Enabled<br />
– Flash is fast but has slow outliers ‒ Erase cycles, wear leveling, etc<br />
� Smart Flash Log feature transparently uses Flash as a parallel write<br />
cache to disk controller cache<br />
– Whichever write completes first wins (disk or flash)<br />
� Better response time and more throughput<br />
� Uses almost no flash capacity (0.1% of capacity)
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