I'm afraid that fulltext search on multiterabytes set of documents can not be implemented on any RDBMS, at least on single box. Specialized fulltext search engines (with exact matching and time to search about one second) has practical limit near 20 millions of docs, cluster - near 100 millions. Bigger collections require engines like a google.

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Teodor Sigaev                                   E-mail: [EMAIL PROTECTED]
                                                   WWW: http://www.sigaev.ru/

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TIP 9: In versions below 8.0, the planner will ignore your desire to
      choose an index scan if your joining column's datatypes do not
      match

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