I/O

The I/O window shows information about the I/O activity.

Physical I/O (per second)

Datafile reads Number of datafile reads per second
Datafile writes Number of datafile writes per second
Redo log writes Number of redo log writes per second

Logical I/O (per second)

Consistent reads Number of blocks in memory that are read in consistent mode. Consistent mode reads are usually associated with query activity.
Current reads Number of blocks in memory that are read in current mode per second. Current mode reads are usually associated with updates.
Block changes Number of database blocks in memory (SGA) that are modified per second.

Rollback segment (per second)

Reads Number of rollback segment reads per second.
Writes Number of rollback segment writes per second.
Waits Number of rollback segment waits per second. High levels of waits may indicate a need to add more rollback segments.

Redo log (per second)

Reads Number of redo log reads per second
Waits Number of redo log waits per second
Writes Number of redo log writes per second

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