有用戶問到這樣一個問題，在進行導出操作時如何轉義口令中的@符號？由于缺省的Oracle會將@符號后面的字串當作服務名來解析，所以不加處理是不行的。有的企業因為安全規則的需要，口令中都會加入@符號。

假定用戶口令如下： SQL> alter user eygle identified by "eygle@com";

User altered. 

如果缺省導出會出現如下錯誤： [oracle@jumper oracle]$ exp eygle/eygle@com file=eygle.dmp tables=test

Export: Release 9.2.0.4.0 - PRoduction on Fri Jan 4 11:17:48 2008Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

EXP-00056: ORACLE error 12154 encounteredORA-12154: TNS:could not resolve service nameEXP-00000: Export terminated unsuccessfully 

通過轉義，可以成功導出： [oracle@jumper oracle]$ exp eygle//"eygle@com/" file=eygle.dmp tables=test

Export: Release 9.2.0.4.0 - Production on Fri Jan 4 11:12:10 2008Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

Connected to: Oracle9i Enterprise Edition Release 9.2.0.4.0 - ProductionWith the Partitioning optionJServer Release 9.2.0.4.0 - ProductionExport done in ZHS16GBK character set and AL16UTF16 NCHAR character set

About to export specified tables via Conventional Path .... . exporting table                          TEST      4136 rows exported 

-The End-