diff --git a/README.md b/README.md
index 316c6589..472f7f4b 100644
--- a/README.md
+++ b/README.md
@@ -9,6 +9,7 @@
 * [《芋道 Spring Boot Elasticsearch 入门》](http://www.iocoder.cn/Spring-Boot/Elasticsearch/?github) 对应 [lab-15](https://github.com/YunaiV/SpringBoot-Labs/tree/master/lab-15) 。
 * [《芋道 Spring Boot MongoDB 入门》](http://www.iocoder.cn/Spring-Boot/MongoDB/?github) 对应 [lab-16](https://github.com/YunaiV/SpringBoot-Labs/tree/master/lab-16) 。
 * [《芋道 Spring Boot 多数据源（读写分离）入门》](http://www.iocoder.cn/Spring-Boot/dynamic-datasource/?github) 对应 [lab-17](https://github.com/YunaiV/SpringBoot-Labs/tree/master/lab-17) 。
+* [《芋道 Spring Boot 分库分表入门》](http://www.iocoder.cn/Spring-Boot/sharding-datasource/?github) 对应 [lab-18](https://github.com/YunaiV/SpringBoot-Labs/tree/master/lab-18) 。
 
 # 安全控制
 
diff --git a/lab-18/lab-18-sharding-datasource-02/src/test/java/cn/iocoder/springboot/lab18/shardingdatasource/mapper/OrderMapperTest.java b/lab-18/lab-18-sharding-datasource-02/src/test/java/cn/iocoder/springboot/lab18/shardingdatasource/mapper/OrderMapperTest.java
index 61734be0..eb9e1251 100644
--- a/lab-18/lab-18-sharding-datasource-02/src/test/java/cn/iocoder/springboot/lab18/shardingdatasource/mapper/OrderMapperTest.java
+++ b/lab-18/lab-18-sharding-datasource-02/src/test/java/cn/iocoder/springboot/lab18/shardingdatasource/mapper/OrderMapperTest.java
@@ -18,7 +18,7 @@ public class OrderMapperTest {
 
     @Test
     public void testSelectById() { // 测试从库的负载均衡
-        for (int i = 0; i < 10; i++) {
+        for (int i = 0; i < 2; i++) {
             OrderDO order = orderMapper.selectById(1);
             System.out.println(order);
         }