Exadata Wait Events in the System I/O Class

The Exadata wait events that are assigned to the System I/O class are of less importance and do not generally show up as major consumers of time. The backup events are the most interesting as they record time for sections of code that have been optimized on the Exadata platform. The others are simply housekeeping events. The non-backup events are listed in Table 12.1, while the backup events are detailed in the following sections.

cell smart incremental backup

This event is used to measure time spent waiting on RMAN when doing an Incremental Level 1 backup. Exadata optimizes incremental backups by offloading much of the processing to the storage tier. This new wait event was added to account for time spent waiting on the optimized incremental backup processing that is offloaded to the storage cells.