diff --git a/docker/README.md b/docker/README.md
index d6abc04..092a854 100644
--- a/docker/README.md
+++ b/docker/README.md
@@ -44,6 +44,14 @@
   
   // remove build cache
   $ docker builder prune
+  
+  // pull latest
+  $ docker-compose pull
+  
+  // restart image
+  $ docker-compose restart
+  
+  // 
   ```
 
   
diff --git a/mysql/README.md b/mysql/README.md
new file mode 100644
index 0000000..24de388
--- /dev/null
+++ b/mysql/README.md
@@ -0,0 +1,29 @@
+# MySQL
+
+
+
+## SSH Tunneling
+
+* to connect to db via SSH tunnel
+
+```shell
+$ ssh -L [local port]:[database host]:[remote port] [username]@[remote host]
+
+// example
+$ ssh -L 3307:rr-zf81fzm6ija52q623.mysql.kualalumpur.rds.aliyuncs.com:3306 tenghieyik@172.22.4.252
+```
+
+* dump
+
+```mysql
+sql> database_name < dump.sql
+
+$ mysqldump db_name > backup.sql
+
+// improve export speed
+$ mysqldump --add-drop-table --add-locks --database db > db.sql
+
+$ mysql --init-command="SET SESSION FOREIGN_KEY_CHECKS=0;SET UNIQUE_CHECKS=0;" -u root -p < Backup_Database.mysql
+
+```
+