System Dump (should be done 3 times with intervals of at least 1 min):
sqlplus "/ as sysdba"
oradebug setmypid
oradebug unlimit
oradebug dump systemstate 10
oradebug tracefile_name
exit;
Hanganalyze:
sqlplus "/ as sysdba"
oradebug setmypid
oradebug unlimit
oradebug hanganalyze 3
exit;
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