[pca] Installation of patch need single user mode

[Martin Paul]

Studer Olivier wrote:
> They are an option to install only the patch downloaded before if the network is up?

It's really better to specify the same patch set (e.g. "missingrs") with the 
"pca --download" and the "pca --install" command, as that will ensure that all 
required patches are there. To ignore certain patches, you can use pca's 
"--ignore" option.

You can set "--dltries=0" to make PCA not try to download patches from Oracle at 
all. It's also possible to provide a list of patch IDs or patch files to PCA 
(like "pca --install 1*.zip" or "pca --install patches.txt"), but be aware that 
it will not resolve patch dependencies in that case. It's on you to feed patches 
in the correct order to PCA.

Hope that helps,
Martin.