Tim Johnson wrote:
<grin> it get worse ..... most of my commercial work is running on servers with ver 3.23.X (sun and RH servers). I enjoy a
        great relationship with my domain hoster (who is also a
programmer who uses mysql a lot), but he has been very cautious about upgrading any of his servers, being concerned about code breaking, etc.

 What argument might be provided to him to upgrade and what caveats
 might be cited?

Details on how to upgrade are available at:
http://dev.mysql.com/doc/mysql/en/upgrade.html

It seems that the 4.0.x branche will not live very long anymore, so upgrading to 4.1.x (via 4.0) might be a good idea if he wants to upgrade.

http://dev.mysql.com/doc/mysql/en/news.html
Lists all the changes in each version. The major features can be found in the D.2 and D.3 documents (for 4.1 and 4.0).

As a hoster he will probably also need to support PHP, etc. There is also a nice book by Adam Trachtenberg: "Upgrading to PHP5" (O'Reilly, July, 2004, 352 p., ISBN 0596006365) which also contains information on how to migrate to PHP5/MySQL4.1 in several steps.

Regards, Jigal.

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