若在Oracle RAC集群数据库中，则可能Data Pump Worker数据泵工作进程在非发起本Expdp的节点上被分配并工作，除非指定了EXPDP参数CLUSTER=NO。 若启动该Workder进程的节点上相应的data pump目录没有合适的权限，则remote node上的Worker将无法正常工作。 可以利用cluster=no参数来Workaround这个由于RAC引起的ORA-19505错误。 [oracle@lab1 ~]$ oerr ora 19505 19505, 00000, "failed to identify file \"%s\"" // *Cause: call to identify the file returned an error // *Action: check additional messages, and check if the file exists   关于EXPDP/IMPDP的CLUSTER参数说明如下： CLUSTER Default: YES Purpose Determines whether Data Pump can use Oracle Real Application Clusters (Oracle RAC) resources and start workers on other Oracle RAC instances. Syntax and Description CLUSTER=[YES | NO] To force Data Pump Import to use only the instance where the job is started and to replicate pre-Oracle Database 11g release 2 (11.2) behavior, specify CLUSTER=NO. To specify a specific, existing service and constrain worker processes to run only on instances defined for that service, use the SERVICE_NAME parameter with the CLUSTER=YES parameter. Use of the CLUSTER parameter may affect performance because there is some additional overhead in distributing the import job across Oracle RAC instances.   关于该ORA-19505更多信息参考以下Note: 
We did expdp on AIX server with mutliple files using filesetsize=10G parameter
and when we are importing into LInux database we are facing below errors:

ORA-31693: Table data object "DBO_ACTIONAL_PROD"."ACT_SUBN_STATS_H_" failed to load/unload and is
being skipped due to error:
ORA-31640: unable to open dump file "/u01/app/oracle/export/utl01p/act04.dmp" for read
ORA-19505: failed to identify file "/u01/app/oracle/export/utl01p/act04.dmp"
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3

 

When you are using a cluster database it is possible for datapump workers to start on
any of the available nodes unless you specify cluster=N. If the nodes that start the
workers do not have access to the datapump directory they will be unable to process
the files. This is proved out when you specify cluster=N to remove the other nodes from the equation.

 

Use cluster=N to run the import from a single node of the RAC cluster which has file access.