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@DiveBrexer

MySQL 最適なテーブル構造解析

テーブル構造は最適なのか?

Q. EXPLAINでINDEXの付け方をチェックする他に何かないのか?
A. 下記Queryを発行することで解析してくれる!!!(sql_analyse.cc で定義されている)
query
SELECT * FROM `table` PROCEDURE ANALYSE();
Field_name Min_value Max_value Min_length Max_length Empties_or_zeros Nulls Avgvalue_or_avg_length Std Optimal_fieldtype
フィールド名 最小値 最大値 最短の長さ 最長の長さ 空や0のフィールド数 NULL数 平均値や平均の長さ ? 最適なタイプ

これで構造を見直せるので参考にできます!!!
Stdの意味が良く分からない…。

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