It is NOT safe to upgrade to 5.0 and then downgrade to 4.0 again.
IMPORTANT NOTE: if you upgrade to InnoDB-4.1.1, you cannot downgrade any
more! That is because earlier versions of InnoDB are not aware of multiple
InnoDB-5.0.0 is essentially the same as InnoDB-4.1.1.
Foreign keys, transactions, and row level locking for MySQL
InnoDB Hot Backup - a hot backup tool for InnoDB which also backs up MyISAM
Order MySQL technical support from https://order.mysql.com/
----- Original Message -----
From: "Sergei Golubchik" <serg@stripped>
Sent: Monday, December 29, 2003 5:13 PM
Subject: Re: MySQL 5.0.0 has been released
> On Dec 29, Thomas Spahni wrote:
> > Hi,
> > is there any change in data format for MySQL 5.0.0? Is it safe (for a
> > of stable 4.0.17) to test 5.0.0 on existing data and then go back to
> > 4.0.17 for production?
> As far as I know it should be safe.
> But, of course, a backup is always recommended :)
> __ ___ ___ ____ __
> / |/ /_ __/ __/ __ \/ / Sergei Golubchik <serg@stripped>
> / /|_/ / // /\ \/ /_/ / /__ MySQL AB, Senior Software Developer
> /_/ /_/\_, /___/\___\_\___/ Osnabrueck, Germany
> <___/ www.mysql.com
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