How to scan 'immediate trace name SYSTEMSTATE level 10' trace files?

Hi ,my 20 TB of database is hanging and my manager told me to run the following system state dump and anaylse the trace file to see which processes etc are hanging the database.
SQL>alter session set events 'immediate trace name SYSTEMSTATE level 10';
I got 2 trace files which are quite large....not sure what to look into.....can anybody plz suggest what to see if in them if database is not responsing
Thanks
gagan

If you dump a couple of hanganalyze every 60 seconds or so. You will be able to see wait chains and identify sessions that are progressing(slow) and those that aren't(hung). Then you can reference this information with the process information in the system state dump. A level 3 or 4 is ok for what you want. Still, if you are not sure where to look in the first place, best to log a SR with Oracle.

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