V$HANG_INFO

7.261 V$HANG_INFO

V$HANG_INFO displays information about hangs found on the cluster.

A hang can be an open wait chain or closed wait chain (cycle or deadlock). A wait chain is a series of sessions that are blocking one another. Each row represents a hang and describes how severe the hang is. This view also includes the victim or final blocker of the hang.

Column	Datatype	Description
`HANG_ID`	`NUMBER`	A number identifying the hang
`HANG_CHAIN_SESSIONS`	`NUMBER`	Indicates how many sessions are in the main wait chain of the hang
`TOTAL_HUNG_SESSIONS`	`NUMBER`	Indicates how many total sessions are affected by the hang, including the main wait chain and any wait chains branching off of the main wait chain
`HANG_TYPE`	`VARCHAR2(18)`	Is set to `Hang` if this is an open wait chain or `Deadlock` if this is a cycle or closed wait chain
`HANG_CREATE_TIME`	`VARCHAR2(20)`	Date and time that the hang was detected
`HANG_RESOLVE_TIME`	`VARCHAR2(20)`	Time that the hang may be automatically resolved
`IGNORED_HANG`	`VARCHAR2(1)`	`Y` - Hang was ignored and will not be automatically resolved at this time `N` - The hang has not yet been verified
`RESOLUTION_ATTEMPTED`	`VARCHAR2(1)`	`Y` - An attempt was made to resolve the hang `N` - No attempt was made to resolve the hang
`GLOBAL_HANG`	`VARCHAR2(1)`	`Y` - The hang spans multiple nodes in the cluster `N` - All of the sessions in the hang reside on a single instance
`ESCALATED_HANG`	`VARCHAR2(1)`	`Y` - An attempt was made to resolve the hang but was unsuccessful, and the hang is becoming more severe. Another resolution attempt will be made. `N` - The first resolution attempt was successful and it was not necessary to escalate the hang to a higher resolution level.
`RESOLUTION_STATUS`	`VARCHAR2(45)`	Contains the reason why the hang was resolved or ignored
`VICTIM_INSTANCE`	`NUMBER`	Instance number of the instance on which the victim or final blocker session resides
`VICTIM_SESSION_ID`	`NUMBER`	Victim or final blocker's Oracle session ID
`VICTIM_SERIAL#`	`NUMBER`	Victim or final blocker's Oracle session serial number
`VICTIM_OSPID`	`VARCHAR2(24)`	Victim or final blocker's operating system process ID
`FATAL_BACKGROUND`	`VARCHAR2(1)`	`Y` - Victim or final blocker is a critical background process `N` - Victim or final blocker is not a critical background process
`PNAME`	`VARCHAR2(5)`	Name of the victim or final blocker process
`WAIT_EVENT_TEXT`	`VARCHAR2(64)`	Resource or event for which the victim or final blocker is waiting; set to `not in a wait` if the session is not waiting on a resource
`VICTIM_QOS_PC_RANK`	`VARCHAR2(12)`	Oracle Database Quality of Service (QoS) Management Performance Class rank of the victim or final blocker of the hang.
`VICTIM_QOS_PC_ITT`	`NUMBER`	Oracle Database QoS Management Performance Class In-Trouble Threshold of the victim or final blocker of the hang
`VICTIM_QOS_PC_RTT`	`NUMBER`	Oracle Database QoS Management Performance Class Root Termination allowed Threshold of the victim or final blocker of the hang
`VICTIM_QOS_PC_KEY`	`NUMBER`	Oracle Database QoS Management Performance Class Key of the victim or final blocker of the hang
`CON_ID`	`NUMBER`	The ID of the container to which the data pertains. Possible values include: `0`: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs. `1`: This value is used for rows containing data that pertain to only the root n: Where n is the applicable container ID for the rows containing data