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                緩存穿透 : DB 承受了沒有必要的查詢流量,意思就是查到空值的時候沒有做緩存處理,再次查詢的時候繼續讀庫了 緩存擊穿:熱點 Key,大量并發讀請求引起的小雪崩, 就是緩存在某個時間點過期的時候,恰好在這個時間點對這個 Key 有大量的并發請求過來,這些請求發現緩存過期一般都會從后端 DB 加載數據并回設到緩存,這個時候大并發的請求可能會瞬間把后端 DB 壓垮 緩存雪崩:緩存設置同一過期時間,引發的大量的讀取數據庫操作 Redis 怎么做到數據落地 Redis 的 5 種數據類型 字符串、哈希、鏈表、有序、無序
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