We used to use a dedicated search machine. That can work very well also.
One benefit we found with the archived data method is that if we run into a problem on the live data it's a lot easier to run utilities to fix it. A smaller database is easier to fix when things go wrong.
The archived data is not as likely to have problems since it is read only. Of course you do have other drawbacks like not being able to edit/delete a thread through normal methods once it is archived.
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