profile and explain

data/3.MySQL高阶/7.查询优化/1. SHOW STATUS/config.json

 {
   "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

data/3.MySQL高阶/7.查询优化/1. SHOW STATUS/show_status.json

+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "show_status.md",
+  "notebook_enable": false,
+  "exercise_id": "889fd9ebeda74ba2a4c90ee0d6c13f0d"
+}
\ No newline at end of file

data/3.MySQL高阶/7.查询优化/1. SHOW STATUS/show_status.md

+# 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; 
+```

data/3.MySQL高阶/7.查询优化/3. SHOW PROFILE/config.json → data/3.MySQL高阶/7.查询优化/2. SHOW PROFILE/config.json

 {
   "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

data/3.MySQL高阶/7.查询优化/2. SHOW PROFILE/show_profile.json

+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "show_profile.md",
+  "notebook_enable": false,
+  "exercise_id": "c785a28bb1474b1c8b9f3fab908041bf"
+}
\ No newline at end of file

data/3.MySQL高阶/7.查询优化/2. SHOW PROFILE/show_profile.md

+# 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

data/3.MySQL高阶/7.查询优化/2. EXPLAIN/config.json → data/3.MySQL高阶/7.查询优化/3. EXPLAIN/config.json

 {
   "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

data/3.MySQL高阶/7.查询优化/3. EXPLAIN/explain.json

+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "explain.md",
+  "notebook_enable": false,
+  "exercise_id": "590a05e39b854e83b081d1984aef191a"
+}
\ No newline at end of file

data/3.MySQL高阶/7.查询优化/3. EXPLAIN/explain.md

+# 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

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
                     }
                   }
                 ],