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(mysql.info)procedure analyse

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Procedure Analyse
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`analyse([max elements,[max memory]])'

This procedure is defined in the `sql/sql_analyse.cc'.  This examines
the result from your query and returns an analysis of the results:

   * `max elements' (default 256) is the maximum number of distinct
     values `analyse' will notice per column.  This is used by
     `analyse' to check if the optimal column type should be of type
     `ENUM'.

   * `max memory' (default 8192) is the maximum memory `analyse' should
     allocate per column while trying to find all distinct values.

     SELECT ... FROM ... WHERE ... PROCEDURE ANALYSE([max elements,[max memory]])