BCS external content type migration

Hi, 
We are migrating from SP 2010 to SP2013 via simple content db backup restore method.
2010 site has external lists connected to SQL DB via BCS. 
When we took backup of whole 2010 content db and restored to 2013 n done upgrade. Post that I have noticed none of External content type is available in 2013. All the external lists are broken. 
Is any way to migrate External content types from 2010 to 2013. 

Hi Praful,
The external content types are stored in the Business Connectivity Services(BCS) application database, so if you only migrating content database the external content types will not be available in the new environment.
You need to detach the BCS application database from the old environment and then copy and attach the database to the new environment.
More references:
http://technet.microsoft.com/en-us/library/cc262483(v=office.15).aspx
http://technet.microsoft.com/en-us/library/jj839719(v=office.15).aspx
If you only need to migrate the external content types, you can follow this link:
http://msdn.microsoft.com/en-us/library/office/gg650431(v=office.14).aspx
Best regards.
Thanks
Victoria Xia
TechNet Community Support

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