Make careful investigation before you apply PSU with CPU Jan,2012

Hi lists  
According to MOS document id 1393363.1, if scnhealthcheck.sql result is "C - 
SCN Headroom is low", then â??apply
the latest recommended patches right nowâ??, this is exactly we used to suggest 
our customers to do, but these few days, we found there is a big risk if you 
apply the latest PSU without careful investigation.

In brief, if you don't apply the PSU, you will never get "ORA-19706: invalid 
SCN" when you select something through database link, but if you applied, it's 
possible to get this error and not easy to get a workaround, even with 
"_external_scn_rejection_threshold_hours" hidden parameters.

attachment is my test, if you have interest, have a look.

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Zhang Leyi (Kamus) <kamusis@xxxxxxxxx>

Visit my blog for more: http://www.dbform.com
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