Write Through

Definitions

1. A caching strategy in which every write operation updates both the cache and the underlying backing store synchronously, guaranteeing that the cache and the persistent layer are always consistent at the cost of higher write latency.

   In plain English: A system that saves data to both the fast temporary copy and the permanent storage at the same time, so they always match.

   Example: "We use write-through caching so reads are fast and we never serve stale data, but writes take a bit longer."

Related Terms

• LRU Cache
• Stale-While-Revalidate
• ETag
• Cache Stampede
• NVMe
• Disk Cache
• Inline Cache
• Write Back