Oracle crashes randomly, but there is no much information in Oracle alert log:
Sat Jun 15 21:57:15 2019
Instance Critical Process (pid: 7, ospid: 2158, DBW0) died unexpectedly
PMON (ospid: 2136): terminating the instance due to error 471
Sat Jun 15 21:57:25 2019
System state dump requested by (instance=1, osid=2136 (PMON)), summary=[abnormal instance termination].
System State dumped to trace file /oracle/<SID>/saptrace/diag/rdbms/<sid>/<SID>/trace/<SID>_diag_2150_20190615215725.trc
Sat Jun 15 21:57:29 2019
Instance terminated by PMON, pid = 2136
Oracle on linux
error 471, OOM killer , KBA , BC-DB-ORA , Oracle , Problem
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