Migration of a database from sql server 2008 r2 to oracle 11 g

We're trying to migrate a Sql server managment studio database to Oracle 11g using SQL Developer 4.0. We can successfully connect to both Sql server managment studion 8.0 and Oracle 11g using the tool, as well as click through the Migration Wizard and start the migration.
This opens the Database Migration dialog box, which indicates the capture process starts normally. we get the following error:
ora :01440 : can not insert null into migrlog (id column) ,
\and then after some time , i get an error that migration failed
I know , that we vcan nt insert null into migrlog table , then pls tell me how can  i resolve fro this problem  . is there any way to solve it,
i am not getting the reason,I thing it may be due to reason that , I have table's column in my source db with more than 30 character.
If i am migrating one by one table . then it is not giving any error, and identifier name is getting shrink in 30 character. but i am not getting the view , stored procedure , indexes , and others
then what is the solution  for that, somebody pls suggest any help?????????????

This forum is dealing with Oracle gateway connecting to a foreign database. When connecting with SQL Server LINKED Server mechanism to Oracle you're using the Oracle OLEDB driver and there's a separate thread that assist you with the Oracle OLEDB driver. Please close this thread and post your issue in this forum:
Oracle Provider for OLE DB

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