Need info about GV$HANG_STATISTICS

Can any one help me understand the hang management framework in detail? Wanted to know details about metrics available in GV$HANG_STATISTICS, how they are computed and frequency of this view getting updated etc.

Hi,
it's information displayed 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.
You found two Views v$hang_info, v$hang_statistics.
Here the output from a running production database.
SQL> select * from v$hang_statistics
STATISTIC# NAME                                               VALUE
         0 number of deadlocks detected and ignored               0
         1 number of hangs detected                               8
         2 number of local hangs                                  7
         3 number of global hangs                                 1
         4 number of transient hangs                              0
         5 hangs ignored due to high CPU on root's node           0
         6 hangs ignored due to high IO on root's node            0
         7 hangs ignored due to application contention            0
         8 hangs ignored due to long running operations           0
         9 hangs monitored due to archiving issues                0
        10 hangs ignored due to archiving issues                  0
        11 hangs ignored, blocked by remote database              0
        12 hangs ignored due to SQL parsing                       0
        13 hangs ignored due to dumping system state              0
        14 hangs ignored, instance termination required           0
        15 hangs ignored, only one active instance                0
        16 number of explicitly resolved hangs                    0
        17 number of self-resolved hangs                          8
        18 total self-resolved hang time in seconds             209
        19 minimum self-resolved hang time in seconds             1
        20 maximum self-resolved hang time in seconds            30
        21 number of HSC matched hangs                            8
        22 hangs resolved due to instance termination             0
23 rows selected.
regards

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