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What is the importance of ft_query_expansion_limit?

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  • What is the importance of ft_query_expansion_limit?

    What is the importance of ft_query_expansion_limit and what exactly it's doing?

    from http://dev.mysql.com/doc/refman/5.0/en/server-system-variabl es.html
    Quote:

    The number of top matches to use for full-text searches performed using WITH QUERY EXPANSION.

    I don't unerstand what they mean by that.

  • #2
    Basically, query expansion performs a full text search and then uses the first few results (configured by ft_query_expansion_limit) to search again and compose your result set. The explanation in the docs is probably better than mine:

    http://dev.mysql.com/doc/refman/5.1/en/fulltext-query-expans ion.html

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    • #3
      Does increasing this value improves performance?

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      • #4
        Unless you are specifically using WITH QUERY EXPANSION in your fulltext queries, this will have no affect on performance.

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        • #5
          Thanks. I'll remember that.

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