There were 400,000 threads with a thread prefix and those threads had about 6,500,000 replies. The board has a total of 8.8 million posts.
I'm by no means an expert, and I've constructed the above queries from reading MySQL documentation. I'm quite proud at myself for accomplishing that, at least. I hoped to gain replies here and at other boards, but my requests for help ended in vain. I finally executed the query early this month and to my delight it was a critical success. I'm running on a 12xSAS and 16GB RAM server. I think it was just a really ineffective, albeit working, query and not a server issue.
If anyone still has the old thread prefixes, the above queries with Paul's touch may help you reset the thread and post titles, which is very useful if you use SEO products. Good luck!
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