I think it should work in this way:   As you said, the old mw is installed at /var/wiki, and the new in /var/wiki-new. Copy all your database tables to new tables with prefix (say "new_") in the same database. set "$wgDBprefix = "new_";" for your new mw. Run maintenance/update.php on /var/wiki-new, but NOT on /var/wiki. Regards, Ross Xu --- On Tue, 9/21/10, trueskew <trueskew(a)gmail.com> wrote: From: trueskew <trueskew(a)gmail.com> Subject: Re: [Mediawiki-l] connect to wikis to the same database? To: "'MediaWiki announcements and site admin list'" <mediawiki-l(a)lists.wikimedia.org> Received: Tuesday, September 21, 2010, 12:02 AM I haven't seen details on whether the database has stayed the same, or what the details of any schema changes may be.  If there's a file that calls them out, please let use know. If not, the INSTALL, UPGRADE, and RELEASE-NOTES files of the mediawiki release provide information for upgrading, and they start with "It is imperative that, prior to attempting an upgrade of the database schema, you take a complete backup of your wiki database and files and verify it." That's a pretty good commercial for not doing what you'd like to do and either moving to another machine (or a virtual machine). For what it's worth, I needed to change the home directory of one of my sites.  I did what you're asking about, but it was with the same version.  -----Original Message----- From: mediawiki-l-bounces(a)lists.wikimedia.org [mailto:mediawiki-l-bounces@lists.wikimedia.org] On Behalf Of Henny Savenije Sent: Monday, September 20, 2010 4:16 AM To: Uwe Brauer; MediaWiki announcements and site admin list Subject: Re: [Mediawiki-l] connect to wikis to the same database? That should work as long as the database structure of the new and old version is the same At 06:33 PM 9/20/2010, you wrote:                   _   _                  (o) (o)       oOOO----(_)----OOOo--- Henny (Lee Hae Kang) ----------------------------- http://www.henny-savenije.pe.kr Portal to all my sites http://www.hendrick-hamel.henny-savenije.pe.kr (in English) Feel free to discover Korea with Hendrick Hamel (1653-1666) http://www.hendrick-hamel.henny-savenije.pe.kr/indexk2.htm In Korean http://www.hendrick-hamel.henny-savenije.pe.kr/Dutch In Dutch http://www.vos.henny-savenije.pe.kr Frits Vos Article about Witsen and Eibokken and his first Korean-Dutch dictionary http://www.cartography.henny-savenije.pe.kr (in English) Korea through Western Cartographic eyes http://www.hwasong.henny-savenije.pe.kr Hwasong the fortress in Suwon http://www.oldKorea.henny-savenije.pe.kr Old Korea in pictures http://www.british.henny-savenije.pe.kr A British encounter in Pusan (1797) http://www.genealogy.henny-savenije.pe.kr/ Genealogy http://www.henny-savenije.pe.kr/phorum Bulletin board for Korean studies _______________________________________________ MediaWiki-l mailing list MediaWiki-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/mediawiki-l _______________________________________________ MediaWiki-l mailing list MediaWiki-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/mediawiki-l