oracle用户名小写时，利用sqlplus连接

[oracle@upright92 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Tue May 22 10:39:34 2018

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, Oracle Label Security, OLAP, Data Mining

and Real Application Testing options

SQL> conn "wqq"/wqq

Connected.

[oracle@upright92 ~]$ sqlplus \"wqq\"/wqq

SQL*Plus: Release 11.2.0.4.0 Production on Tue May 22 10:39:18 2018

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, Oracle Label Security, OLAP, Data Mining

and Real Application Testing options

[oracle@upright92 ~]$ sqlplus '"wqq"/wqq'

SQL*Plus: Release 11.2.0.4.0 Production on Tue May 22 10:22:22 2018

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to:

Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, Oracle Label Security, OLAP, Data Mining

and Real Application Testing options

[oracle@upright92 ~]$ exp '\"wqq\"/wqq' file=2.dump tables=tab GRANTS=Y 

Export: Release 11.2.0.4.0 - Production on Tue May 22 10:34:09 2018

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

With the Partitioning, Oracle Label Security, OLAP, Data Mining

and Real Application Testing options

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                            TAB          0 rows exported

Export terminated successfully without warnings.