There are some very major changes to the database schema between the 1.4 and 1.5 branches of MediaWiki. As has been recommended, check the upgrade notes, check any documentation lurking about on Meta (http://meta.wikimedia.org) and if in doubt, come into the #mediawiki channel (irc://irc.freenode.net/mediawiki) and ask.
As ever, back up both files and the entire MediaWiki database prior to taking any action whatsoever. It is apparently very easy to mess up this upgrade process, according to some reports.
Rob Church
On 07/10/05, Nagaraj,V v.nagaraj@econwiki.lse.ac.uk wrote:
Hi,
If I want to upgrade my wiki from 1.4.9 to 1.5 stable, would I treat it as a standard upgrade within versions? I.e. would I just copy over the files and load up the wiki home page?
This information wasn't so clear in the documentation, so I thought I'd check in with the list.
Vinayak Nagaraj
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