eG Help

For each session module on a monitored instance, this test reports the number and nature of wait events that occurred during the last measurement period. In addition, the test also reports the total number of events (of a type) that occurred across all modules and instances. With the help of these metrics, administrators can figure out how much time an instance has spent waiting and what it was waiting for; a high value is a cause for concern, as it indicates that the instance has waited too long, and could have consequently suffered significant processing delays.

Measurement	Description	Measurement Unit	Interpretation
Cpu_waits	Indicates the number of times since the last measurement period this session module on this instance has waited for CPU.	Number	Ideally, the value of this measure should be low.
User_IO_waits	Indicates the total number of waits that have occurred in this session module on this instance for user I/O, since the last measurement period.	Number	Some of the user I/O wait events include: BFILE read, buffer read retry, db file parallel read, db file scattered read, db file sequential read, and db file single write. Ideally, the value of this measure should be low.
Cluster_waits	Indicates the total number of waits pertaining to cluster resources that have occurred in this session module since the last measurement period.	Number	A low value is desired for this measure.
Commited_waits	Indicates the total number of Commit waits that have occurred in this session module on this instance since the last measurement period.	Number	A low value is desired for this measure. If this measure shows a high value, refer to the detailed diagnosis capability of this measure to identify all the sessions that are affected by commited waits.
Transaction_lock_waits	Indicates the number of times this session module on this instance waited for transaction locks, during the last measurement period.	Number	A low value is desired for this measure. If this measure shows a high value, use the detailed diagnosis of the RAC Transaction Locks test to obtain the detailed report on all the sessions that are affected by the lock waits.
Latch_waits	Indicates the total number of latch waits that have occurred in this session module since the last measurement period.	Number	A low value is desired for this measure.
Other_waits	Indicates the total number of times since the last measurement period waits that should typically not occur on a system (eg., 'wait for EMON to spawn') occurred in this session module on this instance.	Number	Ideally, the value of this measure should be low.