19c rac-expdp备份异常处理

客户反馈，有套19c rac环境，补丁是19.13的，有1个节点使用expdp备份用户异常，报错如下

Connected to: Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
ORA-31626: job does not exist
ORA-31637: cannot create job SYS_EXPORT_SCHEMA_01 for user SYS
ORA-06512: at "SYS.KUPV$FT", line 1142
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 95
ORA-06512: at "SYS.KUPV$FT", line 1751
ORA-39062: error creating master process DM00
ORA-31648: Timeout before master process DM00 finished initialization.
ORA-06512: at "SYS.KUPP$PROC", line 59
ORA-06512: at "SYS.KUPP$PROC", line 310
ORA-06512: at "SYS.KUPV$FT", line 1691
ORA-06512: at "SYS.KUPV$FT", line 1103

参考文档：Data Pump Export Fails to Start, Raising 'ORA-31648: Timeout before master process DM00 finished initialization' Error (Doc ID 2677216.1)

处理办法：

alter system set "_sqlmon_threshold"=0 scope=both sid='*';
alter system set "_sqlmon_threshold"=5 scope=both sid='*';