No. First of all, you cannot uninstall patch 8.1.7.3 because oracle 
hasn't provided
"uninstall" in any of the recent patch sets. You should just install 
over the existing
8.1.7.4. The ONLY uninstall is the full, cold backup. If you decide 
that the patch set
is not for you after, let's say, a week, you are stuck. Your only 
option is to ask oracle
for "one off" patch for your particular bug.
That is, generally, why I do not recommend plunging, head first, into 
the new patchset as
soon as it appears. While waiting for two or three months, I monitor 
RDBMS forums on the
metablink and released "one off" patches. Only when I am reasonably 
sure that everything
is going to be hunky dory will I request my boss to authorize the 
upgrade. 



On 2002.06.05 18:18 david hill wrote:
> I was just wondering if I'm allowed to apply a new patch after I have
> already installed patch. Say from 8.1.7.3 to 8.1.7.4.
> Do I have to uninstall the .3 patch and then install the .4 or what?
> 
> Thanks
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> Please see the official ORACLE-L FAQ: http://www.orafaq.com
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> Author: david hill
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-- 
Mladen Gogala
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Mladen Gogala
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