How to skip updating certain packages by YUM

I’m runing RHEL/CentOS for a group of database servers, and they mainly use MySQL for productive services. Recently I noticed that MySQL’s new feathers and bug fixes that comes from system updates make little sense to our needs, so I’m planing not to apply these changes on our live servers, unless it’s really needed.
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CentOS-5.4 i386 and x86_64 Released

CentOS community annouced the availability of CentOS-5.4 for i386 and x86_64 Architectures this week. It’s based on the upstream release Redhat Enterprise Linux 5.4.0 and includes packages from all variants including Server and Client. This is just an announcement email, not the release notes. The Release Notes for CentOS-5.4 can be found on-line at wiki.centos.org.
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