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Jitendra rajput
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Issues can be related  either Upgrade process or data.
- If the issue is related to upgrade process then it can be easily fixed with the help of Liferay you need to check issues.liferay.com.
- Issues related to data will vary from database to database. If the DB 1 is having some corrupt entries in certain table then while upgrade it can create issue. 

There are certain best practices you need to follow before you perform upgrade.
Check best practices mentioned in my blog post. 
http://itsliferay.blogspot.in/2012/06/upgrade-database-from-liferay-52-sp-3.html

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