ISSUE : FIX for Data loss in clustered index occurs when you run online build index in SQL Server 2012
Microsoft release a fix for above issue and now available for download for SQL Server 2012SP2.
Refer Article :
http://support.microsoft.com/kb/2969896
Download Link :
http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=2969896&kbln=en-us
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Reference : Rohit Garg (http://mssqlfun.com/)