ORA-00056 DDL lock on object 'string.string' is already held in an incompatible mode Cause: The attempted lock is incompatible with the DDL lock already held on the object. This happens if you attempt to drop a table that has parse locks.Action: Before attempting to drop a table, check that it has no parse locks. Wait a few minutes before retrying the operation.
Cause: The attempted lock is incompatible with the DDL lock already held on the object. This happens if you attempt to drop a table that has parse locks.Action: Before attempting to drop a table, check that it has no parse locks. Wait a few minutes before retrying the operation.
说说你的具体情况
就是说,你能否正常连接上oracle?
看你出错信息,可能连接oracle有问题
exp userid=username/password@service_name file=c:\dmpname.dmp