EXP-00091: Exporting questionable statistics.

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标题：EXP-00091: Exporting questionable statistics.

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一.出现EXP-00091错误

[oracle@localhost tmp]$ exp "'/ as sysdba'" tables=testxuchao.TAB_XN_PY_DICT \
> file=/tmp/xifenfei.dmp log=/tmp/xifenfei.log
Export: Release 9.2.0.4.0 - Production on Mon Jan 16 16:02:37 2012
Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.
Connected to: Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.4.0 - Production
Export done in US7ASCII character set and AL16UTF16 NCHAR character set
server uses ZHS16GBK character set (possible charset conversion)
About to export specified tables via Conventional Path ...
Current user changed to TESTXUCHAO
. . exporting table                 TAB_XN_PY_DICT      25433 rows exported
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
Export terminated successfully with warnings.

当环境变量和数据库的不一致，在导出统计信息时候，会报EXP-00091错误。

二.查看NLS相关参数

[oracle@localhost tmp]$ echo $NLS_LANG
AMERICAN
SQL>  col value for a30
SQL>  select parameter,value from nls_database_parameters
   2  where parameter like '%CHARACTERSET%';
PARAMETER                      VALUE
------------------------------ ------------------------------
NLS_CHARACTERSET               ZHS16GBK
NLS_NCHAR_CHARACTERSET         AL16UTF16

三.解决方法
1.设置NLS_LANG为NLS_CHARACTERSET

[oracle@localhost tmp]export NLS_LANG=american_america.ZHS16GBK
[oracle@localhost tmp]$ exp "'/ as sysdba'" tables=testxuchao.TAB_XN_PY_DICT \
> file=/tmp/xifenfei.dmp log=/tmp/xifenfei.log
Export: Release 9.2.0.4.0 - Production on Mon Jan 16 16:08:10 2012
Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.
Connected to: Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.4.0 - Production
Export done in ZHS16GBK character set and AL16UTF16 NCHAR character set
About to export specified tables via Conventional Path ...
Current user changed to TESTXUCHAO
. . exporting table                 TAB_XN_PY_DICT      25433 rows exported
Export terminated successfully without warnings.

2.使用statistics=none

[oracle@localhost tmp]$ exp "'/ as sysdba'" tables=testxuchao.TAB_XN_PY_DICT \
> file=/tmp/xifenfei.dmp log=/tmp/xifenfei.log  statistics=none
Export: Release 9.2.0.4.0 - Production on Mon Jan 16 16:08:53 2012
Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.
Connected to: Oracle9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.4.0 - Production
Export done in US7ASCII character set and AL16UTF16 NCHAR character set
server uses ZHS16GBK character set (possible charset conversion)
About to export specified tables via Conventional Path ...
Current user changed to TESTXUCHAO
. . exporting table                 TAB_XN_PY_DICT      25433 rows exported
Export terminated successfully without warnings.

One thought on “EXP-00091: Exporting questionable statistics.” 

  1. Applies to:
Oracle Server - Enterprise Edition - Version: 9.2.0.1 to 10.2.0.4 - Release: 9.2 to 10.2
Information in this document applies to any platform.
Symptoms
When attempting to export, you get the following errors:
...
. . exporting table EMP 100 rows exported
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
. . exporting table DEPT 10 rows exported
EXP-00091: Exporting questionable statistics.
EXP-00091: Exporting questionable statistics.
...
Cause:
The issue is caused by the following setup:
The client characterset (NLS_LANG) does not match the server characterset.
The pre-calculated optimizer statistics are flagged as questionable at export time if:
1. There are row errors while exporting.
2. The client characterset or NCHAR characterset does not match the server characterset or NCHAR characterset.
3. A QUERY clause is specified.
4. Only certain partitions or subpartitions are exported.
==>This customer does not match 1, 3, 4.
==>This customer matches 2, the client side characterset is not set, the server characterset is
ZHS16GBK, so the client side characterset does not match server side characterset.
$ echo $NLS_LANG
su: NLS_LANG: Parameter not set.
SQL> select parameter,value from nls_database_parameters
   2 where parameter like '%CHARACTERSET%';
NLS_NCHAR_CHARACTERSET
AL16UTF16
NLS_CHARACTERSET
ZHS16GBK
Solution:
To implement the solution, please execute the following steps:
1. Set NLS_LANG on OS, then exp again:
$export NLS_LANG=american_america.ZHS16GBK
$echo $NLS_LANG
$exp system/passwd full=y
Or
2. You can add statistics=none:
$exp system/passwd full=y statistics=none
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