title: VARCHAR2 field and NVARCHAR2 exsit in the same table,the former is correct,the latter was garbled
body: <p>the database A field Type is:
  select column_name,data_type From all_tab_columns ;</p>
  
  <pre><code>COLUMN_NAME             DATA_TYPE
  ------------------------------------
  NAME                    VARCHAR2
  ID_ISSUE_PLACE          VARCHAR2
  NATIONALITY             NVARCHAR2
  </code></pre>
  
  <p>I want to export a table with expdp:</p>
  
  <pre><code>expdp abc/123 tables=A.CUST:PARTNUM_0 exclude=grant,index,contraint,statistics,trigger DIRECTORY=DATATMP filesize=100M dumpfile=expdp_%U.dmp parallel=4 cluster=N COMPRESSION=DATA_ONLY
  </code></pre>
  
  <p>Then,I import the dmp file to my local oracle,the field 'NATIONALITY' is correct , but the other field is garbled.</p>
  
  <pre><code>impdp abc/123 DIRECTORY=DATATMP DUMPFILE=expdp_01.dmp 
  </code></pre>
  
  <blockquote>
    <p>[oracle@db01 tmp]$ impdp bi71/bi71 DIRECTORY=datatmp
    DUMPFILE=expdp_01.dmp </p>
    
    <p>Import: Release 11.2.0.1.0 - Production on Tue Sep 6 11:18:05 2016</p>
    
    <p>Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights
    reserved.</p>
    
    <p>Connected to: Oracle Database 11g Enterprise Edition Release
    11.2.0.1.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options Master table
    "A"."SYS_IMPORT_FULL_01" successfully loaded/unloaded Starting
    "A"."SYS_IMPORT_FULL_01":  abc/******** DIRECTORY=datatmp
    DUMPFILE=expdp_01.dmp  Processing object type TABLE_EXPORT/TABLE/TABLE
    Processing object type TABLE_EXPORT/TABLE/TABLE_DATA . . imported
    "A"."CUST":"PARTNUM_0"      5.990 MB   78037 rows</p>
  </blockquote>
  
  <p><strong>Statement:Not a windows client problems,because the vietnamese charecter has been displayed properly.Here with reason screenshot windows client, is to make the results better clarity.</strong></p>
  
  <p><a href="http://i.stack.imgur.com/Bi1wU.png" rel="nofollow">screenshot</a></p>
  
  <p><strong>I found a rule,once vietnamese nationality in this line appears,the field NAME,ID_ISSUE_PLACE are garbled.</strong></p>
  
  <p>How to resolve? thanks(^_^).</p>