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+---
+title: Redis数据过期后的删除策略
+published: 2025-09-17
+description: ''
+image: ''
+tags: [Redis,删除策略,缓存过期]
+category: '中间件 > Redis'
+draft: false 
+lang: ''
+---
+
+![](https://blog.meowrain.cn/api/i/2025/09/17/10egvdw-1.webp)
+
+Redis数据过期主要有两种删除策略
+
+![](https://blog.meowrain.cn/api/i/2025/09/17/10hp6uw-1.webp)
+## 定期删除
+Redis每隔一段时间会随机检查一定数量的键，如果发现过期的键，就把它删除。这种方式能够在后台持续清除过期数据，防止内存膨胀。
+
+缺点： CPU占用稍微有点儿大
+优点：能及时清除过期的键，防止内存膨胀。
+## 惰性删除
+
+在每次访问键的时候，去看这个键是不是已经过期了，如果过期了就删除它。
+这种策略保证了在使用过程中只删除不再需要的数据，但在不访问过期键的时候不会被清除。
+
+优点： 减少CPU占用
+缺点： 如果一直没查到某个key，这个键就可能不会被删除，时间久了可能导致内存膨胀。
+
+# 内存淘汰策略
+![](https://blog.meowrain.cn/api/i/2025/09/17/10iw8w4-1.webp)
+
+# Redis键过期时间的设置
+![](https://blog.meowrain.cn/api/i/2025/09/17/10f1n1j-1.webp)
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