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Mar 30, 2020
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更正笔误 #699

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2 changes: 1 addition & 1 deletion docs/database/Redis/redis-collection/Redis(9)——集群入门实践教程.md
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Expand Up @@ -509,7 +509,7 @@ a3406db9ae7144d17eb7df5bffe8b70bb5dd06b8 127.0.0.1:7002@17002 master - 0 1584428

#### 方案二：一致性哈希分区

一致性哈希算法将 **整个哈希值空间** 组织成一个虚拟的圆环，范围是 *[0 - 2<sup>32 - 1</sup>]*，对于每一个数据，根据 `key` 计算 hash 值，确数据在环上的位置，然后从此位置沿顺时针行走，找到的第一台服务器就是其应该映射到的服务器：
一致性哈希算法将 **整个哈希值空间** 组织成一个虚拟的圆环，范围是 *[0 , 2<sup>32</sup>-1]*，对于每一个数据，根据 `key` 计算 hash 值，确数据在环上的位置，然后从此位置沿顺时针行走，找到的第一台服务器就是其应该映射到的服务器：

![](https://upload-images.jianshu.io/upload_images/7896890-40e8a2c096c8da92.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

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2 changes: 1 addition & 1 deletion docs/database/数据库索引.md
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Expand Up @@ -49,7 +49,7 @@ B+树是有序的，在这种范围查询中，优势非常大，直接遍历比

**一张数据表有只能有一个主键，并且主键不能为null，不能重复。**

**在mysql的InnoDB的表中，当没有显示的指定表的主键时，InnoDB会自动先检查表中是否有唯一索引的字段，如果有，则选择改字段为默认的主键，否则InnoDB将会自动创建一个6Byte的自增主键。**
**在mysql的InnoDB的表中，当没有显示的指定表的主键时，InnoDB会自动先检查表中是否有唯一索引的字段，如果有，则选择该字段为默认的主键，否则InnoDB将会自动创建一个6Byte的自增主键。**

### 二级索引(辅助索引)
**二级索引又称为辅助索引，是因为二级索引的叶子节点存储的数据是主键。也就是说，通过二级索引，可以定位主键的位置。**
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