Updating an Mdk 7.2 to 8.0 system has always crashed out (tried on three 
different systems now) and always left the system in an unusable state. 
The option to update an existing ``live'' system piece-by-piece Debian 
style would be good, but to do this you would have to redefine a lot of 
packages to be less specific about what dependent packages they require. 
Maybe for 8.1?

For example, php_pgsql doesn't _really_ need the latest, greatest 
postgresql (almost any version will do) but says that it does. If it 
were a little more decoupled, you could update Apache, PHP etc in one 
step, and update postgresql separately. This would also mean less 
thrashing around when RPM goes hunting for dependencies, and would give 
the administrator finer grained control (e.g. maybe they want to update 
PHP to get around a security issue but not PostgreSQL because the newer 
version breaks something critical).

-- 
Will opens the door to success. -- Louis Pasteur


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