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This test reports the number and nature of session wait events that occurred on each instance of the monitored RAC during the last measurement period. In addition, the test also reports the total number of events (of a type) that occurred across all 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 slowdowns.

Measurement	Description	Measurement Unit	Interpretation
CPU	Indicates the number of times the sessions on this instance waited for CPU since the last measurement period.	Number	Ideally, the value of this measure should be low.
IO	Indicates the total number of times the sessions on this instance waited 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_count	Indicates the total number of times the sessions on this instance waited for cluster resources since the last measurement period.	Number	A low value is desired for this measure.
Commited_count	Indicates the total number of Commit waits that have occurred since the last measurement period in this session of this Oracle instance.	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.
TXLock	Indicates the number of times the sessions 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	Indicates the total number of latch waits that have occurred since the last measurement period in this session of this Oracle instance.	Number	A low value is desired for this measure.
Configuration	Indicates the total number of configuration wait events that occurred in the sessions of this instance during the last measurement period.	Number	Configuration waits are waits caused by inadequate configuration of database or instance resources (for example, undersized log file sizes, shared pool size). Ideally, the value of this measure should be low.
Sys_IO	Indicates the total number of system I/O wait events that occurred in the sessions of this instance during the last measurement period.	Number	A high value indicates performance degradation of the Oracle server.
Network	Indicates the total number of times since the last measurement period waits related to network messaging (for example, 'SQL*Net more data to dblink', occurred in the sessions of this instance.	Number	A low value is desired for this measure.
Other	Indicates the total number of times since the last measurement period waits that should typically not occur on a system (e.g., 'wait for EMON to spawn') occurred in the sessions of this instance.	Number	Ideally, the value of this measure should be low.
Subtotal	Indicates the overall number of waits that have occurred since the last measurement period in the sessions of this Oracle instance.	Number	Ideally, the value of this measure should be low.