Using mysqldump and loading directly into 5.4 *might* work, but you should never do any of this on your production system without testing.
Get another box, start with 4.1 and do the upgrade on a test server -- even test your queries as there a few incompatible changes between 4 and 5. One you know the exact steps you need to take, and how much time it takes, then you can plan the upgrade accordingly on your live system. Regards, Gavin Towey -----Original Message----- From: monem mysql [mailto:monem.my...@gmail.com] Sent: Thursday, October 01, 2009 9:31 AM To: mysql@lists.mysql.com Subject: upgrading from 4.1 to 5.4 Hello I have to upgrade many mysql databases from mysql 4 and 4.1 to 5.4 with a large size 2.7 TB All tables use the MyISAM engine. I have to make that update on live system with minimal down time possible. The official method takes too much time. But I've read that we can use '*dump and reload'* to upgrade directly to 5.1, will it work with 5.4? Also the tables contain many charset? Will they be altered? It's first time that I do that. Are there any better solution and any precaution to take? thanks for your help. monem The information contained in this transmission may contain privileged and confidential information. It is intended only for the use of the person(s) named above. If you are not the intended recipient, you are hereby notified that any review, dissemination, distribution or duplication of this communication is strictly prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
