expdp时遇到ORA-39097&ORA-39065&ORA-39079&ORA-06512&ORA-24033

expdp时各种报错，我也是醉了，版本为11.2.0.1，expdp命令为：

nohup expdp HQ_X1/HQ_X1 DUMPFILE=HQ_X1%u.DMP DIRECTORY=DIR1 parallel=8  flashback_scn=10838324803 &

ORA-39097: Data Pump job encountered unexpected error -39079

ORA-39065: unexpected master process exception in DISPATCH

ORA-39079: unable to enqueue message RP,KUPC$C_1_20150623215653,MCP,KUPC$A_1_20150623224430,1,Y

ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86

ORA-06512: at "SYS.KUPC$QUE_INT", line 965

ORA-24033: no recipients for message

ORA-39065: unexpected master process exception in SEND

ORA-39079: unable to enqueue message RP,KUPC$C_1_20150623215653,MCP,KUPC$A_1_20150623224430,1,Y

ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86

ORA-06512: at "SYS.KUPC$QUE_INT", line 965

ORA-24033: no recipients for message

报这个错往往跟aq_tm_processes=0有关，查看了aq_tm_processes参数，发现果然设置为0，

于是将其set为aq_tm_processes>1的值,问题解决。