diff --git a/README.md b/README.md
index adb34f5b81..e59ff811d3 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,8 @@ brew install openssl
 
 ## Usage
 
+### Start Datanode
+
 ```
 // Start datanode with default options.
 cargo run -- datanode start
@@ -59,3 +61,47 @@ Start datanode with config file:
 ```
 cargo run -- --log-dir=logs --log-level=debug datanode start -c ./config/datanode.example.toml
 ```
+
+### SQL Operations
+
+1. Connecting DB by [mysql client](https://dev.mysql.com/downloads/mysql/):
+
+   ```
+   # The datanode listen on port 3306 by default.
+   mysql -h 127.0.0.1 -P 3306
+   ```
+
+2. Create table:
+
+   ```SQL
+   CREATE TABLE monitor (
+     host STRING,
+     ts BIGINT,
+     cpu DOUBLE DEFAULT 0,
+     memory DOUBLE,
+     TIME INDEX (ts),
+     PRIMARY KEY(ts,host)) ENGINE=mito WITH(regions=1);
+   ```
+
+3. Insert data:
+
+   ```SQL
+   INSERT INTO monitor(host, cpu, memory, ts) VALUES ('host1', 66.6, 1024, 1660897955);
+   INSERT INTO monitor(host, cpu, memory, ts) VALUES ('host2', 77.7, 2048, 1660897956);
+   INSERT INTO monitor(host, cpu, memory, ts) VALUES ('host3', 88.8, 4096, 1660897957);
+   ```
+
+4. Query data:
+
+   ```SQL
+   mysql> SELECT * FROM monitor;
+   +-------+------------+------+--------+
+   | host  | ts         | cpu  | memory |
+   +-------+------------+------+--------+
+   | host1 | 1660897955 | 66.6 |   1024 |
+   | host2 | 1660897956 | 77.7 |   2048 |
+   | host3 | 1660897957 | 88.8 |   4096 |
+   +-------+------------+------+--------+
+   3 rows in set (0.01 sec)
+   ```
+   You can delete your data by removing `/tmp/greptimedb`.