Hi Mark,
there is no problem to run both MySQL servers 3.23 / 4.0.16.
Just pay attention to (particulary options file) :
- configure two my.cnf files, each version must have it server specific
options file.
  remarks that you cannot put the same file in the same place  /etc/.
  Place each of them in his own install directory
/usr/local/mysql-version_number/data/my.cnf for example.
- use two different PORT, SOCKET, DATADIR, LOGs FILE names
- you are already setup a new directory for version 4.0.16, it's ok .
- prepare two start/stop script (with different names in /etc/init.d/rc.d/)
and customize them
  according to each my.cnf variable present in these scripts.

This is sufficient for running the 2 servers version independently .
I have the same configuration (on RedHat 8, neverthless).

Regards,
Thierno6C - MySQL 4.0.15

----- Original Message ----- 
From: "Mark Teehan" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, November 06, 2003 8:35 AM
Subject: best practices for running 3.23 and 4.016 on the same box?


> Hi all
> I am planning an upgrade for a very busy 3.23 server to 4.016. As we dont
> have a text box, I have to install both releases on the same machine, and
> test 4.016 for some time.  For 4.016 I will unpack a tar.gz, as I dont
> trust rpm not to clobber at least some of the 3.23 installation. I will
> then set up a new 4016/data directory, and copy each database in for
> testing. My question is : can someone give me some guidelines on the best
> practices for setting this up? How to make the two installations
completely
> independant of each other? Also anything I should know about 4.016 thats
> not mentioned in the release notes?
> I am running on redhat 7.2.
>
> TIA!
> Mark, Singapore.
>
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