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Like the wait activity on stand-alone Oracle servers, administrators also need to observe the wait activity on Oracle servers that are part of a Real Application Cluster (RAC). This test connects to the global view on the monitored Oracle server in an RAC, and pulls out critical statistics pertaining to the session-level cluster-related events that wait on the global cache or any other global resource on that Oracle server. Using this information, administrators can determine the cluster events on which the database spends most of its time, and which Oracle instances and current connections are responsible for the reported waits.

This test needs to be enabled only while monitoring the Oracle servers in an RAC environment.

Measurement	Description	Measurement Unit	Interpretation
Total_waits	The total number of times waits happened on this event since the last measurement period	Number	If the value of this measure is very high, then you can drill down further using the detailed diagnosis capability (if enabled) of the eG Enterprise suite to discover which Oracle instances and current connections may be responsible for this. The detailed diagnosis of this measure reveals the Oracle instance on which the events are waiting, the session IDs of the sessions that caused the wait events to occur, the users who inititated the sessions, and the total number of waits, wait time, and the maximum wait time for every session.
Total_waits_timedout	The total number of waits on this event that timedout since the last measurement period	Number	A large number of timedout wait events is typically, undesirable. Use the Oracle-provided documentation to probe the cause of the timeout.
Avg_time_waited	The average duration for which the waits on this wait event persisted since the last measurement period	Secs	Ideally, the value of this measure should be low. A very high value or a consistent increase in this value is indicative of a problem situation requiring further investigation. Use the detailed diagnosis capability to zoom into the session that has contributed to the abnormal increase in wait time.
Max_time_waited	The high watermark of wait time for this wait event	Secs