diff --git "a/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/1. SHOW STATUS/config.json" "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/1. SHOW STATUS/config.json"
index 6fc334052f880c38f93be7d5d372c8b4e0404d9d..b2e4f8d62abd038c6c1bbfb598d2a2e13823fc0f 100644
--- "a/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/1. SHOW STATUS/config.json"	
+++ "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/1. SHOW STATUS/config.json"	
@@ -1,9 +1,13 @@
 {
   "node_id": "mysql-3574b2e5c9ca475789d9d582d7726906",
-  "keywords": ["show status"],
+  "keywords": [
+    "show status"
+  ],
   "children": [],
-  "export": [],
+  "export": [
+    "show_status.json"
+  ],
   "keywords_must": [],
   "keywords_forbid": [],
-  "group": 0
+  "group": 2
 }
\ No newline at end of file
diff --git "a/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/1. SHOW STATUS/show_status.json" "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/1. SHOW STATUS/show_status.json"
new file mode 100644
index 0000000000000000000000000000000000000000..0df90f0d2e4d4220314df88a5065cefed462938c
--- /dev/null
+++ "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/1. SHOW STATUS/show_status.json"	
@@ -0,0 +1,7 @@
+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "show_status.md",
+  "notebook_enable": false,
+  "exercise_id": "889fd9ebeda74ba2a4c90ee0d6c13f0d"
+}
\ No newline at end of file
diff --git "a/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/1. SHOW STATUS/show_status.md" "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/1. SHOW STATUS/show_status.md"
new file mode 100644
index 0000000000000000000000000000000000000000..33c8cee564ba9cbc736f42d657d91d5a28531ebd
--- /dev/null
+++ "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/1. SHOW STATUS/show_status.md"	
@@ -0,0 +1,30 @@
+# SHOW STATUS
+
+Goods 数据库近期在每日高峰时段很慢，Joe 想初步的查看一下数据库的工作状态，他应该执行：
+
+## 答案
+
+```mysql
+show global status; 
+```
+
+## 选项
+
+### A
+
+```mysql
+show status; 
+```
+
+
+### B
+
+```mysql
+show session status; 
+```
+
+### C
+
+```mysql
+show local status; 
+```
diff --git "a/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/3. SHOW PROFILE/config.json" "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/2. SHOW PROFILE/config.json"
similarity index 55%
rename from "data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/3. SHOW PROFILE/config.json"
rename to "data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/2. SHOW PROFILE/config.json"
index 1c9c14cd6a94db1022a0f7018911434141b7c9bf..c939b000ede339a250202caeaa220fcc88c29f52 100644
--- "a/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/3. SHOW PROFILE/config.json"	
+++ "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/2. SHOW PROFILE/config.json"	
@@ -1,9 +1,13 @@
 {
   "node_id": "mysql-f0b12126dd3e4be09010a308a822bc32",
-  "keywords": ["show profile"],
+  "keywords": [
+    "show profile"
+  ],
   "children": [],
-  "export": [],
+  "export": [
+    "show_profile.json"
+  ],
   "keywords_must": [],
   "keywords_forbid": [],
-  "group": 0
+  "group": 2
 }
\ No newline at end of file
diff --git "a/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/2. SHOW PROFILE/show_profile.json" "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/2. SHOW PROFILE/show_profile.json"
new file mode 100644
index 0000000000000000000000000000000000000000..9d8aafb4a5376981cf50aa9a3dedb5cd2d7043d9
--- /dev/null
+++ "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/2. SHOW PROFILE/show_profile.json"	
@@ -0,0 +1,7 @@
+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "show_profile.md",
+  "notebook_enable": false,
+  "exercise_id": "c785a28bb1474b1c8b9f3fab908041bf"
+}
\ No newline at end of file
diff --git "a/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/2. SHOW PROFILE/show_profile.md" "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/2. SHOW PROFILE/show_profile.md"
new file mode 100644
index 0000000000000000000000000000000000000000..ccdb872541bcde822285eb7eaa822da0fe49d1ef
--- /dev/null
+++ "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/2. SHOW PROFILE/show_profile.md"	
@@ -0,0 +1,34 @@
+# SHOW PROFILE
+
+数据分析组的几个分析查询很慢，希望 Joe 提供帮助，他准备查看一下这几条查询的 Profile 信息，应该：
+
+1. 执行`SET SESSION profiling = 1;`打开 profile
+2. 执行查询后，根据 `show profiles`找到要剖分的查询id
+3. 执行 `SHOW PROFILE FOR QUERY xxx;` 查看剖分信息
+4. 执行`SET SESSION profiling = 0;`关闭 profile 
+
+## 答案
+
+```
+1, 2, 3, 4
+```
+
+## 选项
+
+### A
+
+```
+2, 3
+```
+
+### B
+
+```
+1, 2, 3
+```
+
+### C
+
+```
+2, 3, 4
+```
\ No newline at end of file
diff --git "a/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/2. EXPLAIN/config.json" "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/3. EXPLAIN/config.json"
similarity index 52%
rename from "data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/2. EXPLAIN/config.json"
rename to "data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/3. EXPLAIN/config.json"
index 64c96ed7d5880d56570b543cf5bca20402f17c87..22fc67cba00975a6c2da5ca49c68ee1d37c4d064 100644
--- "a/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/2. EXPLAIN/config.json"	
+++ "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/3. EXPLAIN/config.json"	
@@ -1,9 +1,14 @@
 {
   "node_id": "mysql-a42f617d4eb54aabbc649bdde4485117",
-  "keywords": ["explain"],
+  "keywords": [
+    "explain",
+    "explain analyze"
+  ],
   "children": [],
-  "export": [],
+  "export": [
+    "explain.json"
+  ],
   "keywords_must": [],
   "keywords_forbid": [],
-  "group": 0
+  "group": 2
 }
\ No newline at end of file
diff --git "a/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/3. EXPLAIN/explain.json" "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/3. EXPLAIN/explain.json"
new file mode 100644
index 0000000000000000000000000000000000000000..6411e44e7f026d63491e9d8d477c1256b71ac0ef
--- /dev/null
+++ "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/3. EXPLAIN/explain.json"	
@@ -0,0 +1,7 @@
+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "explain.md",
+  "notebook_enable": false,
+  "exercise_id": "590a05e39b854e83b081d1984aef191a"
+}
\ No newline at end of file
diff --git "a/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/3. EXPLAIN/explain.md" "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/3. EXPLAIN/explain.md"
new file mode 100644
index 0000000000000000000000000000000000000000..d13406cbcf1fb516eb84ac0a31f316fe5b475839
--- /dev/null
+++ "b/data/3.MySQL\351\253\230\351\230\266/7.\346\237\245\350\257\242\344\274\230\345\214\226/3. EXPLAIN/explain.md"	
@@ -0,0 +1,81 @@
+# EXPLAIN
+
+Joe 从交易服务中发现了一些高频查询和慢查询，例如
+
+```mysql
+with recursive r(id) as (select id
+                         from orders
+                         where id = $1
+                         union
+                         select d.id
+                         from orders as d
+                                  join r on d.id = r.id + 1)
+select orders.id, content
+from orders
+         join r on orders.id = r.id;
+```
+
+，他应该从何入手分析优化？
+
+## 答案
+
+在测试库使用 
+
+```mysql
+explain with recursive r(id) as (select id
+                         from orders
+                         where id = $1
+                         union
+                         select d.id
+                         from orders as d
+                                  join r on d.id = r.id + 1)
+select orders.id, content
+from orders
+         join r on orders.id = r.id;
+```
+
+进行剖分，对于需要了解详细执行计划的使用
+
+```mysql
+explain analyze with recursive r(id) as (select id
+                         from orders
+                         where id = 100
+                         union
+                         select d.id
+                         from orders as d
+                                  join r on d.id = r.id + 1)
+select orders.id 
+from orders
+         join r on orders.id = r.id;
+```
+
+进行详细分析。
+
+## 选项
+
+### A
+
+对查询设计的字段加索引
+
+### B
+
+备份数据库，删除重建
+
+### C
+
+使用
+
+```mysql
+analyze with recursive r(id) as (select id
+                         from orders
+                         where id = 100
+                         union
+                         select d.id
+                         from orders as d
+                                  join r on d.id = r.id + 1)
+select orders.id 
+from orders
+         join r on orders.id = r.id;
+```
+
+进行剖分。
\ No newline at end of file
diff --git a/data/tree.json b/data/tree.json
index 19652ea7315a7567b2f36ec364ba5ce678ff3886..64eec76e8746986a51453996966ac7087c38146b 100644
--- a/data/tree.json
+++ b/data/tree.json
@@ -2048,31 +2048,32 @@
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": [],
-                      "group": 0
+                      "group": 2
                     }
                   },
                   {
-                    " EXPLAIN": {
-                      "node_id": "mysql-a42f617d4eb54aabbc649bdde4485117",
+                    " SHOW PROFILE": {
+                      "node_id": "mysql-f0b12126dd3e4be09010a308a822bc32",
                       "keywords": [
-                        "explain"
+                        "show profile"
                       ],
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": [],
-                      "group": 0
+                      "group": 2
                     }
                   },
                   {
-                    " SHOW PROFILE": {
-                      "node_id": "mysql-f0b12126dd3e4be09010a308a822bc32",
+                    " EXPLAIN": {
+                      "node_id": "mysql-a42f617d4eb54aabbc649bdde4485117",
                       "keywords": [
-                        "show profile"
+                        "explain",
+                        "explain analyze"
                       ],
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": [],
-                      "group": 0
+                      "group": 2
                     }
                   }
                 ],