http://www.infoworld.com/d/security/fundamental-oracle-flaw-revealed-184163
http://www.infoworld.com/t/data-management/calling-all-oracle-customers-184103?source=fssr
Oracle has published this On Its MOS Bug 12371955 Backup task can cause increased SCN growth rate leading to ORA-600 [2252] errors with Document ID [ID 12371955.8] and Old existing Document 253977.1 will also give some information on it.
for this to be fixed , One should apply the latest CPU patch released on 18-Jan-2012 by Oracle.
Oracle has published an article on MOS yesterday: note 1376995.1 with an associated script “scnhealthcheck.sql” you can find and download in note 1393363.1.which are very helpful.
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Sriram Sanka
Hi there, This is SCP Ranga Rao Sanka working as (A product Manager/Principal DBA)., I have a broad range of Experience in Administration and Implementation in the areas of Database, Cloud, and Other Servers. I am one of the moderators at ORAFAQ. The primary purpose of this blog is to share knowledge.
All the code snippets, URLs, and everything in this blog are from My experience, My Learnings from different websites & forums. so please test the posts on your testing Environment first.
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Sriram Sanka 
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