我一直在尝试各种选项和不同的用户帐户来运行 expdp，以便它可以包含用户/模式信息，所以当我运行 impdp 命令时，如果它不存在，它将重新创建用户。我不能得到这个工作。我已经尝试过使用用户（dba 角色的成员），并且在运行 expdp 命令时也尝试过使用“as sysdba”帐户。我从日志中可以看到，没有导出 USER 元数据。因此，当我尝试运行 impdp 时，它抛出了一个关于“用户不存在”的错误。我需要做什么才能使其正常工作？
====== 日志 =======
C:\>expdp schemas=myschema directory=DATA_PUMP_DIR dumpfile=expdp_myschema.dmp l
ogfile=expdp_myschema.log
Export: Release 12.1.0.2.0 - Production on Tue Aug 2 11:54:05 2016
Copyright (c) 1982, 2014, Oracle and/or its affiliates. All rights reserved.
Username: / as sysdba
Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit
Production
With the Partitioning, OLAP, Advanced Analytics and Real Application Testing opt
ions
WARNING: Oracle Data Pump operations are not typically needed when connected to
the root or seed of a container database.
Starting "SYS"."SYS_EXPORT_SCHEMA_01": /******** AS SYSDBA schemas=myschema dir
ectory=DATA_PUMP_DIR dumpfile=expdp_myschema.dmp logfile=expdp_myschema.log
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 64 KB
Processing object type SCHEMA_EXPORT/DEFAULT_ROLE
Processing object type SCHEMA_EXPORT/PRE_SCHEMA/PROCACT_SCHEMA
Processing object type SCHEMA_EXPORT/TABLE/TABLE
Processing object type SCHEMA_EXPORT/TABLE/STATISTICS/TABLE_STATISTICS
Processing object type SCHEMA_EXPORT/STATISTICS/MARKER
. . exported "MYSCHEMA"."PRODUCT" 5.507 KB 1 rows
Master table "SYS"."SYS_EXPORT_SCHEMA_01" successfully loaded/unloaded
******************************************************************************
Dump file set for SYS.SYS_EXPORT_SCHEMA_01 is:
C:\APP\ORACLE\ADMIN\ORADEV\DPDUMP\EXPDP_MYSCHEMA.DMP
Job "SYS"."SYS_EXPORT_SCHEMA_01" successfully completed at Tue Aug 2 11:54:18 20
16 elapsed 0 00:00:09