At 6:00am Tuesday, February 16, MySQL services on webdb.uvm.edu will be briefly unavailable so they can be upgraded from MySQL 5.0.72 to 5.1.41. Database connections open at this time will break, but downtime should only be a few seconds as this will be an upgrade by server failover.
MySQL 5.1 features greatly improved performance for many queries, table partitioning, a job scheduler (think cron for SQL), many good additions to the database metadata available in the information_schema database, and big improvements to data replication to other database servers, which should make service failover more reliable. See http://dev.mysql.com/doc/refman/5.1/en/mysql-nutshell.html for more details.
I've compared as much as possible the list of changes to current webdb usage, and do not believe there should be upgrade issues. In addition, the webdb replication slave has been running MySQL 5.1 since last week, and it is to this server that we will move services next Tuesday. If you have questions or concerns, please let me know.
Systems Architecture & Administration
Enterprise Technology Services
The University of Vermont