问题 : ORA-1400 During Import of Export Dump Written in Direct Path Mode

connect test/test

drop table a_tab purge;

#> imp test/test file=a_tab.dmp tables=a_tab


Import: Release 11.1.0.7.0 - Production on Mon May 18 17:19:21 2009

Copyright (c) 1982, 2007, Oracle. All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options

Export file created by EXPORT:V11.01.00 via direct path
import done in WE8MSWIN1252 character set and AL16UTF16 NCHAR character set
. importing TEST's objects into TEST
. importing TEST's objects into TEST
. . importing table "A_TAB"
IMP-00019: row rejected due to ORACLE error 1400
IMP-00003: ORACLE error 1400 encountered
ORA-01400: cannot insert NULL into ("TEST"."A_TAB"."COL001")
Column : 1
Column :
IMP-00019: row rejected due to ORACLE error 1400
IMP-00003: ORACLE error 1400 encountered
ORA-01400: cannot insert NULL into ("TEST"."A_TAB"."COL001")
Column : 2
Column : 0 rows imported
Import terminated successfully with warnings.

Cause

The root cause of this behavior is the new feature introduced with 11gR1:

- the columns with property 1073741824 (see the column value PROPERTY in COL$ for column COL001) are columns with defaults that are not saved in the column. This means on disk, the null values for this column must be replaced by its default obtained from the column definition:

connect / as sysdba
select col#, name, property
from   col$
where  obj# in (select object_id
                from   dba_objects
                where  owner = 'TEST' and
                       object_name = 'A_TAB');

COL#       NAME                           PROPERTY
---------- ------------------------------ ----------
         1 ID                                      0
         2 COL001                         1073741824

2 rows selected.


This mechanism doesn't work properly when direct path is used with original export (the value is not replaced by its default but the NULL values is stored in export dump. This will produce ORA-1400 during import).

Original export (exp)is desupported in 11g so there is no opened bug against this product.

Solution

1. Use DataPump export/import utilities (expdp/impdp)

or:

2. Start traditional export utility (exp) in conventional path mode (DIRECT=N).

如下重新导出：

exp system/oracle@IODAC file=DEV_IODAC_`date +"%Y%m%d%H%M%S"`.dmp log=DEV_IODAC_`date +"%Y%m%d%H%M%S"`.log buffer=40960000 direct=N recordlength=65535 consistent=y full=y

再导入就不再出现错误了