6.3.4 Monitoring Exadata Smart Flash Log

Exadata Smart Flash Log reduces the average latency for performance-sensitive redo log write I/O operations, thereby eliminating performance bottlenecks that may occur due to slow redo log writes. Exadata Smart Flash Log removes latency spikes by simultaneously performing redo log writes to two media devices. The redo write is acknowledged as soon as the first write to either media device completes.

Originally, Exadata Smart Flash Log was used to perform simultaneous writes to disk and flash storage. However, Oracle Exadata System Software release 20.1 adds a further optimization, known as Smart Flash Log Write-Back, that uses Exadata Smart Flash Cache in Write-Back mode instead of disk storage.

• Monitoring Exadata Smart Flash Log Using AWR
  
• Monitoring Exadata Smart Flash Log Using Database Statistics and Wait Events
  
• Monitoring Exadata Smart Flash Log Using Exadata Metrics
  
• What to Look For When Monitoring Exadata Smart Flash Log