upgrading mysql

[aaron]

Perhaps a simple question. The solaris server we have has an older mysql. I don't know which version since I did not install it. The mysql main file is now segment faulting for some reason. I restored a backup but its not working either. It just worked a few days ago. I assume the file is now corrupted because of this?
Can I just upgrade mysql? Will all databases have to be added again?
I really just need the main mysql file replaced, but I don't know an easy way to do that. The original build directory is long past gone.
Is upgrading a decent solution for this, or what else might I try?
Thanks,
Aaron
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