I recommend backing up your MW database before attempting this, but you will have to rename your MediaWiki tables first:
Code:
RENAME TABLE
oldname TO prefix_oldname,
oldname2 TO prefix_oldname2,
...
etc
After this, you'll need to modify your LocalSettings.php file with your "prefix_".
If you're a coder you should be able to generate a query for this fairly easily so you don't have to type it out manually. We are considering adding the capability to import wikis from a separate database in the future, but it currently has a low priority.
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