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Upgrading from MySQL 4 to 5.1

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Upgrading from MySQL 4 to 5.1
Hi:

I am popping a new server, replacing an old one with MySQL 4 with a new one, and I put MySQL 5.1 on it.

So my old webpage servers have the MySQL 4 client. I tried to concurrently install the MySQL 5.1 client, but it won't let me- I have to uninstall the MySQL 4 client first. So, should I do this (will the 5.1 client be backward compatible with the current 4 database?) or so I wait until I get the new server installed, close all the sites, remove the 4 client, install the 5.1 client and bring them back up?

Does that make sense? Can I use the 5.1 client on the 4 database is my question.

Thanks!
dave

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