Re: Question: do you relink and bounce or just bounce or non, after your OS patching

Hi Sam,

It's not just the kernel updates you need to be concerned with, but also the shared libraries. The Oracle binaries and libraries are dynamically linked to several system libraries. In Linux, for example, Oracle is linked to glibc (which is updated relatively often) and several others. So any time those libraries are updated, it's best to make sure that Oracle's binaries and libraries have the correct entry points into the system libraries they are dynamically linked with.

Rich

p.s. In Linux, you can take a look at the libraries dynamically linked in an executable using the "ldd" command. See man pages for usage, warnings, etc.

On Fri, Oct 22, 2021 at 1:53 PM Tharmarajah, Sam < sambavan.tharmarajah_at_usask.ca> wrote:

> Hi All,
>
>
>
> We are interested to know, what does the oracle community do when it comes
> to databases and os patching, especially when there is no kernel patch? The
> reason is that when there is no kernel patch, most of the times, our
> database servers doesn’t get restarted. That would leave the databases up
> and running, without a restart. When reading metalink document, Doc ID
> 1467060.1 “Relinking Oracle HOME FAQ” , oracle recommends manually
> relinking the OH, after OS patching. Even though most of the times these OS
> patches had not caused any issue, there are occasions, where some databases
> have had performance degradations on these scenarios. Those times, just a
> restart addressed the problems.
>
>
>
> To me, at least a restart of the databases after the OS patching will help
> to reinitialize the process with the new or updated libraries that are
> dynamically linked. Though I would prefer to relink and restart. But the
> systems folks think it could be an over kill, as most of the OS patches are
> quiet stable.
>
>
>
> What are your thoughts and justifications on doing the things the way you
> do?
>
>
>
> Thanks in advance to all your responses.
>
>
>
> Thanx,
>
> Sam
>

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