In a write-throughcache, the data is written to the cache and to the disk before returning to the writing process to continue.
在write - through cache模式下,在返回到写入流程并继续之前,数据将写入到缓存然后再写到磁盘。
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In a write-behind cache, data reads and updates are all serviced by the cache, but unlike a write-throughcache, updates are not immediately propagated to the data store.