Export: Release 11.2.0.3.0 - Production on Sun Jul 3 16:47:02 2016
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing o Export done in US7ASCII character set and AL16UTF16 NCHAR character set server uses AL32UTF8 character set (possible charset conversion)
About to export specified tables via Conventional Path ... . . exporting table EMP 14 rows exported EXP-00091: Exporting questionable statistics. EXP-00091: Exporting questionable statistics. Export terminated successfully with warnings. [oracle@host01 ~]$
二.MOS查询
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APPLIES TO:
Oracle Database - Enterprise Edition - Version 9.0.1.0 to 12.1.0.2 [Release 9.0.1 to 12.1] Information in this document applies to any platform. ***Checked for relevance on 13-Aug-2104***
SYMPTOMS
You received errors:
EXP-00091: Exporting questionable statistics
during export.
CAUSE
Beginning with Oracle 9i by default export attempts to include statistics in the export. In pre-Oracle 9i versions statistics are not included unless it is specified.
SOLUTION
a. If the statistics of a table are not required to be included in export, then take the export with parameter STATISTICS=NONE. Example:
b. In case, the statistics are need to be included, you can use STATISTICS=ESTIMATE or COMPUTE (default is Estimate).
Note: The export will still generate the warning message about the questionable statistics in one of the following cases even if using STATISTICS=ESTIMATE / COMPUTE:
1. There are row errors while exporting
2. The client character set or NCHAR character set does not match the server character set or NCHAR character set (the NLS_LANG is different than the database character set for example).
3. A QUERY clause is specified
4. Only certain partitions or subpartitions are exported.
The situation in case 2 is the most frequent and can be solved by setting the NLS_LANG character set of the client to the character set of the database.
REFERENCES
BUG:1862413 - EXPORT & DEFAULT FOR STATISTICS SHOULD BE PRE-9I COMPATIBLE NOTE:159787.1 - Import parameter: STATISTICS=SAFE
[oracle@host01 ~]$ exp system/sys file=emp_dept.dmp tables=scott.emp Export: Release 11.2.0.3.0 - Production on Sun Jul 3 17:26:30 2016 Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing o Export done in US7ASCII character set and AL16UTF16 NCHAR character set server uses AL32UTF8 character set (possible charset conversion) About to export specified tables via Conventional Path ... Current user changed to SCOTT . . exporting table EMP 14 rows exported EXP-00091: Exporting questionable statistics. EXP-00091: Exporting questionable statistics. Export terminated successfully with warnings. [oracle@host01 ~]$ exp system/sys file=emp_dept.dmp tables=scott.emp STATISTICS=NONE Export: Release 11.2.0.3.0 - Production on Sun Jul 3 17:26:50 2016
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved
Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing o Export done in US7ASCII character set and AL16UTF16 NCHAR character set server uses AL32UTF8 character set (possible charset conversion) About to export specified tables via Conventional Path ... Current user changed to SCOTT . . exporting table EMP 14 rows exported Export terminated successfully without warnings. [oracle@host01 ~]$
第二种解决方案：
SQL> select * from v$nls_parameters where parameter='NLS_CHARACTERSET';
PARAMETER VALUE ---------------------------------------------------------------- NLS_CHARACTERSET AL32UTF8 SQL>
或者：
SQL> select * from nls_database_parameters t where t.parameter='NLS_CHARACTERSET'; PARAMETER VALUE -------------------------------------------------------------------- NLS_CHARACTERSET AL32UTF8 SQL>
[oracle@host01 ~]$ echo $NLS_LANG
[oracle@host01 ~]$ export NLS_LANG=AMERICAN_AMERICA.AL32UTF8 [oracle@host01 ~]$ echo $NLS_LANG AMERICAN_AMERICA.AL32UTF8 [oracle@host01 ~]$ exp system/sys file=emp_dept.dmp tables=scott.emp Export: Release 11.2.0.3.0 - Production on Sun Jul 3 17:23:50 2016 Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP, Data Mining and Real Application Testing o Export done in AL32UTF8 character set and AL16UTF16 NCHAR character set
About to export specified tables via Conventional Path ... Current user changed to SCOTT . . exporting table EMP 14 rows exported Export terminated successfully without warnings. [oracle@host01 ~]$
5.1 High Level API Structure ara::com提供了一个支持AUTOSAR服务模型的API。服务有Method、Event、Filed和Trigger。 Method:在服务应用程序中执行一个可以返回值的函数(如校准方法)。 Event:当特定条件发生时(例如制动事件)，服务应用程序发送一个事件(也可能包括一个值)。客户端应用程序可以订阅事件。 Filed:在
英文原网址查看 旋转投影统计(RoPs)特征 在本教程中，我们将学习如何使用pcl::ROPSEstimation类来提取点特性。在这门课中实现的特征提取方法是由Yulan Guo, Ferdous Sohel, Mohammed Bennamoun, Min Lu and Jianwei Wanalso在他们的文章《旋转投影统计用于三维局部表面描述和目标识别》中提出的。 理论基础 特征提
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