Our copy of MySQL (4.0.15'-Max') is on a Linux Mandrake 9.x server. We installed it from an RPM (actually an MDK, which is functionally the same thing) and are running MySQL as a service.
Would it be possible to run a second copy of MySQL, ideally the latest 4.1.x, on our server in parallel with the 4.0.15 instance so that I could get a look at 4.1.x to see if it can do what I want it to do? If it is possible, how do I set the two different versions up so that both could run simultaneously and independently?
Also, if it is possible to run two instances concurrently, what is the safest way of migrating my databases to 4.1.x when I am satisfied that I want to do so?
Or would I be better to simply upgrade my 4.0.15 to the latest available version of 4.1.x?
Rhino:
It would be easier to upgrade to 4.1, although it would be possible to run two instances side by side. Just install 4.1 under a different root (e.g /opt/mysql-4.1), and make sure to fix up mysqld_safe from 4.1 to read the correct my.cnf
4.1 should be a fairly safe bet at this point if you mostly use the features that are from 4.0.
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