diff --git a/MySQL/memo.md b/MySQL/memo.md
index b3dceab..6fb8911 100644
--- a/MySQL/memo.md
+++ b/MySQL/memo.md
@@ -23,3 +23,37 @@ SQL> SELECT @@autocommit;
 SQL> SET AUTOCOMMIT=0;  -- OFFにセット
 -- SET AUTOCOMMIT=1;  -- ONにセット
 ```
+
+### DBとテーブルのサイズ確認
+- DB
+
+mysqlに接続した状態で（DBを選択していなくてもOK）
+```
+SELECT 
+    table_schema, sum(data_length) /1024/1024 AS mb 
+FROM 
+    information_schema.tables  
+GROUP BY 
+    table_schema 
+ORDER BY       
+    sum(data_length+index_length) DESC;
+```
+
+- テーブル
+
+mysqlに接続して対象DBに入っている状態で
+```
+SELECT  
+    table_name, engine, table_rows AS tbl_rows,
+    avg_row_length AS rlen,  
+    floor((data_length+index_length)/1024/1024) AS allmb,  #総容量
+    floor((data_length)/1024/1024) AS dmb,  #データ容量
+    floor((index_length)/1024/1024) AS imb   #インデックス容量
+FROM 
+    information_schema.tables  
+WHERE
+    table_schema=database()  
+ORDER BY
+    (data_length+index_length) DESC;
+```
+参考：https://qiita.com/ikenji/items/b868877492fee60d85ce