查看alert日志出现如下错误：

2019-07-19 03:19:38.940000 +08:00

ORA-25455 encountered when generating server alert SMG-3503

2019-07-19 03:20:39.159000 +08:00

Exception [type: SIGSEGV, Address not mapped to object] [ADDR:0x666564726E12] [PC:0x98699BA, koccngt()+74] [flags: 0x0, count: 1]

Errors in file /home/oracle/app/oracle/diag/rdbms/hdqtls/hdqtls/trace/hdqtls_mmon_33280.trc  (incident=36178):

ORA-07445: exception encountered: core dump [koccngt()+74] [SIGSEGV] [ADDR:0x666564726E12] [PC:0x98699BA] [Address not mapped to object] []

Incident details in: /home/oracle/app/oracle/diag/rdbms/hdqtls/hdqtls/incident/incdir_36178/hdqtls_mmon_33280_i36178.trc

Use ADRCI or Support Workbench to package the incident.

See Note 411.1 at My Oracle Support for error and packaging details.

2019-07-19 03:20:41.421000 +08:00

Dumping diagnostic data in directory=[cdmp_20190719032041], requested by (instance=1, osid=33280 (MMON)), summary=[incident=36178].