按条件导出数据

Subject:  EXP-56 and ORA-911 During Export Using The Query Clause
  Doc ID:  Note:205074.1 Type:  PROBLEM
  Last Revision Date:  25-OCT-2005 Status:  PUBLISHED


Facts
~~~~~
1. Oracle Releases 8.1.7 or upwards on MS-Windows Platform.

2. Perform a Table export using the QUERY clause
   e.g.:
      C:\> exp scott/tiger tables=scott.emp
            query=\"WHERE job=\'SALESMAN\' AND sal\<1600\"
            file=PartEmp.dump log=PartEmpExp.log


Symptoms
~~~~~~~~
Your Export using the QUERY clause terminates successfully with
the following error messages:

     ... (left out first part)

     About to export specified tables via Conventional Path ...
     . . exporting table                            EMP
     EXP-00056: ORACLE error 911 encountered
     ORA-00911: invalid character
     Export terminated successfully with warnings.

If you import the dump file in another existing user schema, e.g.:
      C:\> imp system/manager fromuser=scott touser=steve
            file=PartEmp.dump log=PartEmpImp.log
only the table without rows will be imported.


Changes
~~~~~~~
1. You recently added or modified the QUERY clause of your export statement.

2. You recently ported a Unix script on your MS-Windows platform.


Cause
~~~~~
You are most probably encountering these
     EXP-00056: ORACLE error 911 encountered
     ORA-00911: invalid character
error messages due to some syntax errors in your where condition specified
by the QUERY parameter.

The escape character ('\') has to be used in a different way depending your
platform.


Fix
~~~
Double-check the value assigned to your QUERY parameter.

On MS-Windows platforms, don't use the escape character (\) neither before
single quotes ('), double-quotes (" nor before any arithmetical signs (<, >
within the where condition.

You only need to enclose your QUERY parameter with either \" or with
triple quotes """.

For example:
To export a subset of scott's emp table equivalent to

     SQL> SELECT * FROM emp WHERE job='SALESMAN' AND sal<1600;

On MS-Windows platforms, you'll need to use one of the following syntax:
Either:
     C:\> exp scott/tiger tables=scott.emp
           query=\"WHERE job='SALESMAN' AND sal<1600\"
           file=PartEmp.dump log=PartEmpExp.log
or
     C:\> exp scott/tiger tables=scott.emp
           query="""WHERE job='SALESMAN' AND sal<1600"""
           file=PartEmp.dump log=PartEmpExp.log

Instead of the following one used on most common Unix platforms:
        $ exp scott/tiger tables=scott.emp
           query=\"WHERE job=\'SALESMAN\' AND sal\<1600\"
           file=PartEmp.dump log=PartEmpExp.log

Note that double quotes (", single quotes ('), greater than (> and lower
than (< are UNIX reserved characters and thus need to be escaped on UNIX
platforms.


Related Documents
~~~~~~~~~~~~~~~~~
- Note 91864.1 Query= Syntax in Export in 8i
- Oracle9i Database Utilities Release 2 (9.2), Chapter 1 - Export
  available online :
  http://docs.oracle.com/cd_a97630 ... 52/ch01.htm#1005843