在使用impdp还原oracle数据库时报错如下：

Processing object type SCHEMA_EXPORT/SYSTEM_GRANT
ORA-39083: Object type SYSTEM_GRANT failed to create with error:
ORA-31625: Schema SYSTEM is needed to import this object, but is unaccessible
ORA-01031: insufficient privileges

创建完成用户后通过如下语句赋权：
grant resource,connect,create view to 你的用户名称;
grant read,write on directory ecology to 你的用户名称;
grant connect,resource,dba to 你的用户名称;