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 Re: History merges 

The instructions are all laid out at Wikipedia:How to fix cut-and-paste moves. As I found out quickly, when you try to move an article from Title A to Title B and Title B already exists, the software will automatically delete the edits of Title B for you when you move the article. Try to minimise the number of revisions you need to delete and restore as deleting and restoring pages is one of the most taxing operations in MediaWiki. Also, it's a good idea to say in the move summary that the move shouldn't be reverted. Once I was history merging Melbourne, and a well-meaning editor tried to move it back while I was working on the history merge, which resulted in Melbourne disappearing from Wikipedia for a few minutes. Maybe I'll try the same thing at Auckland one day -). Hope this helps some. ''''''87 "