Write through (都寫啦)

同時寫數db & cache

  • 優點
    1. 完整的數據一制性
    2. 發生系統災難崩潰時不會丟失資料
  • 缺點
    1. 同時寫入db & cache,因此寫的延遲性會偏高

Write around (寫DB)


  • 優點
    1. 直接寫入db,因此寫得延遲會低一些
    2. 發生系統災難崩潰時不會丟失資料
  • 缺點
    1. 依賴 read-miss 更新緩存

Write-back (寫緩存)

  • 優點
    1. 速度fucking快
  • 缺點
    2. 發生系統災難崩潰時資料8888888


Cache eviction policies

  • First In First Out (FIFO)
  • Last In First Out (LIFO)
  • Least Recently Used (LRU)
  • Most Recently Used (MRU)
  • Least Frequently Used (LFU)
  • Random Replacement (RR)


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