diff --git a/HowtoMySQL/Troubleshooting.md b/HowtoMySQL/Troubleshooting.md
index aef82a20..2ef19b1b 100644
--- a/HowtoMySQL/Troubleshooting.md
+++ b/HowtoMySQL/Troubleshooting.md
@@ -842,4 +842,10 @@ On peux égelement calculer le ratio d'espace non utilisé sur une table, exempl
 
 On calcule le ratio de cette manière, (30 + 27) = 57 ; 29/57 = 0.5
 
-C'est à dire que la table contient 50% d'espace vide.
\ No newline at end of file
+C'est à dire que la table contient 50% d'espace vide.
+
+Voici une requêtes SQL qui indique également le ratio de fragmentation de chaque tables :
+
+~~~
+SELECT ENGINE,   concat(TABLE_SCHEMA, '.', TABLE_NAME) as table_name,   round(DATA_LENGTH/1024/1024, 2) as data_length,   round(INDEX_LENGTH/1024/1024, 2) as index_length,   round(DATA_FREE/1024/1024, 2) as data_free,   (data_free/(index_length+data_length)) as frag_ratio FROM information_schema.tables WHERE DATA_FREE > 0 ORDER BY frag_ratio DESC;
+~~~
\ No newline at end of file