alternate client restore fails with recovery target incarnation changed during recovery

From: hrishy <hrishys_at_yahoo.co.uk>
Date: Fri, 1 Jul 2011 04:07:35 +0100 (BST)
Message-ID: <1309489655.13467.YahooMailClassic_at_web29009.mail.ird.yahoo.com>

Hi
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I have a RAC database with instances called RAC[1-4] we duplicated this to a single instance database called TRAC using alternate client restore.
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It restored all the datafiles and the archivelog files but when trying to recover the restored datafiles by applying the archives it started throwing a error like
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And i could see
ORA-00283: recovery session canceled due to errors ORA-19906: recovery target incarnation changed during recovery
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and when i looked into the database i saw there were 2 incarnations of the database whereas the target database from where it was cloned has only one incarnation.
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can anybody explain what is the reason that the incarnation automatically changes and why ?
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Another DBA solved the issue by reseting the incarnation to 1 and regsitering the logfiles manually and recovering the database but i did not understand why this happened

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Received on Thu Jun 30 2011 - 22:07:35 CDT