A friend's database accidentally powered down, restart error ORA-600 [KCCSBCK_FIRST] [1] ..., the environment is Oracle816OPS
View Metalink.http: //metalink.roacle.com/metalink/plsql/ml2_documents.showdocument? P_id = 157536.1 & p_database_id = not
After both machines are restarted, they will solve the problem.
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