MySQLのデータベースやテーブルのサイズを確認する方法

データベースのサイズを確認

SELECT
    table_schema                                         AS "データベース名"
  , FLOOR(SUM(data_length + index_length) / 1024 / 1024) AS "合計容量(MB)"
FROM information_schema.tables
GROUP BY
    table_schema
ORDER BY
    SUM(data_length + index_length) DESC
;

テーブルのサイズを確認

SELECT
    table_name                                        AS "テーブル名"
  , FLOOR((data_length + index_length) / 1024 / 1024) AS "合計容量(MB)"
  , FLOOR((data_length) / 1024 / 1024)                AS "データ容量(MB)"
  , FLOOR((index_length) / 1024 / 1024)               AS "インデックス容量(MB)"
  , table_rows                                        AS "行数"
  , avg_row_length                                    AS "平均行容量"
  , engine                                            AS "ストレージエンジン"
FROM information_schema.tables
WHERE table_schema = database()
ORDER BY
    (data_length + index_length) DESC
;