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27.4.1. Procedure Analyse

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 does notice per column. This is used by analyse to check whether the optimal data type should be of type ENUM.

  • max_memory (default 8192) is the maximum amount of memory that analyse should allocate per column while trying to find all distinct values.

SELECT ... FROM ... WHERE ... PROCEDURE ANALYSE([max_elements,[max_memory]])

 
 
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