Cannot connect to Oracle database from SQL Server

Hi
We have set up a SQL Server linked server and tried to use this SQL Server linked server to connect to Oracle database. We are using SQL Server 2008 and Oracle client 11g 11.02.00.01. However, we got this error message:
Msg 7347, Level 16, State 1, Line 1
OLE DB provider 'OraOLEDB.Oracle' for linked server 'OurLinkedServer' returned data that does not match expected data length for column '[OraOLEDB.Oracle].Ourfieldname'. The (maximum) expected data length is 6, while the returned data length is 2.
We are able to connect some of the tables ok but some of the tables are not connected and got the above error message.
Any suggestions are greatly appreciated.
Thanks a lot
Tom

Hi
Here is more information. We just found out that the Oracle database team changed the character set to something else and then they changed it back to UTF8.
Currently, it is using UTF8 character set on the Oracle side. Will this causing us this error message on our sql server linked server?
The error message said "The (maximum) expected data length is 6, while the returned data length is 2."
This refers to a field/column with char(1)
Any suggestions are greatly appreciated
Thank you
Tom

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Thanks for the reply. I have attached the server.log herewith :
[#|2008-10-05T11:44:45.945+0530|INFO|sun-appserver-pe8.0|javax.enterprise.system.tools.admin|_ThreadID=12;|ADM1006:Uploading the file to:[C:\Documents and Settings\Administrator\Local Settings\Temp\s1astempdomain1server-1629282413\server\study.war]|#]
[#|2008-10-05T11:44:45.955+0530|INFO|sun-appserver-pe8.0|javax.enterprise.system.tools.admin|_ThreadID=12;|ADM1007:Uploaded the remote file at: [C:\Documents and Settings\Administrator\Local Settings\Temp\s1astempdomain1server-1629282413\server\study.war]|#]
[#|2008-10-05T11:44:46.225+0530|INFO|sun-appserver-pe8.0|javax.enterprise.system.tools.admin|_ThreadID=12;|ADM1041:Sent the event to instance:[ModuleDeployEvent -- undeploy web/study]|#]
[#|2008-10-05T11:44:46.686+0530|INFO|sun-appserver-pe8.0|javax.enterprise.system.tools.admin|_ThreadID=12;|ADM1042:Status of dynamic reconfiguration event processing:[success]|#]
[#|2008-10-05T11:44:47.947+0530|INFO|sun-appserver-pe8.0|javax.enterprise.system.tools.deployment|_ThreadID=12;|DPL5109: EJBC - START of EJBC for [study]|#]
[#|2008-10-05T11:44:47.977+0530|INFO|sun-appserver-pe8.0|javax.enterprise.system.tools.deployment|_ThreadID=12;|Processing beans ...|#]
[#|2008-10-05T11:44:47.987+0530|INFO|sun-appserver-pe8.0|javax.enterprise.system.tools.deployment|_ThreadID=12;|DPL5110: EJBC - END of EJBC for [study]|#]
[#|2008-10-05T11:44:48.158+0530|INFO|sun-appserver-pe8.0|javax.enterprise.system.tools.deployment|_ThreadID=12;|Total Deployment Time: 2043 msec, Total EJB Compiler Module Time: 40 msec, Portion spent EJB Compiling: 1%
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|#]
[#|2008-10-05T11:44:48.278+0530|INFO|sun-appserver-pe8.0|javax.enterprise.system.tools.deployment|_ThreadID=12;|deployed with moduleid = study|#]
[#|2008-10-05T11:44:48.378+0530|INFO|sun-appserver-pe8.0|javax.enterprise.system.tools.admin|_ThreadID=12;|ADM1041:Sent the event to instance:[ModuleDeployEvent -- deploy web/study]|#]
[#|2008-10-05T11:44:48.488+0530|INFO|sun-appserver-pe8.0|javax.enterprise.system.container.web|_ThreadID=12;|WEB0100: Loading web module [study] in virtual server [server] at [study]|#]
[#|2008-10-05T11:44:51.202+0530|INFO|sun-appserver-pe8.0|javax.enterprise.system.tools.admin|_ThreadID=12;|ADM1042:Status of dynamic reconfiguration event processing:[success]|#]
[#|2008-10-05T11:46:06.771+0530|WARNING|sun-appserver-pe8.0|javax.enterprise.system.stream.err|_ThreadID=16;|Cannot connect to the database. java.sql.SQLException: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified|#]
[#|2008-10-05T11:46:06.871+0530|SEVERE|sun-appserver-pe8.0|javax.enterprise.system.container.web|_ThreadID=16;|StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception
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     at java.lang.SecurityManager.checkPermission(SecurityManager.java:524)
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     at com.sun.enterprise.J2EESecurityManager.checkExit(J2EESecurityManager.java:70)
     at java.lang.Runtime.exit(Runtime.java:88)
     at java.lang.System.exit(System.java:715)
     at org.apache.jsp.login_jsp._jspService(login_jsp.java:76)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:141)
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     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:325)
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     at javax.servlet.http.HttpServlet.service(HttpServlet.java:861)
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     at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:289)
     at java.security.AccessController.doPrivileged(Native Method)
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     at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:205)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:283)
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     at org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:192)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:263)
     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:156)
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     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:156)
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     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:156)
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     at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:156)
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     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:979)
     at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:211)
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     at java.lang.Thread.run(Thread.java:534)
|#]
regards,
NNJ

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