Is cache penetration of redis the same as cache penetration?

No, Redis cache breakdown and penetration are different concepts. Penetration refers to concurrent access to uncached data leading to direct access to the database; penetration refers to malicious requests accessing non-existent data, resulting in misses in both cache and database. The solution is to use mutex locks and parameter verification respectively.

Redis Cache Penetration and Cache Penetration

Problem: Redis Cache Penetration Is it the same as cache penetration?

Answer: No, Redis cache breakdown and cache penetration are two different concepts.

Cache breakdown

• Definition: When there is no data in the cache and multiple requests access the same data at the same time, caching occurs is penetrated and accesses the database directly.
• Cause: The cache has expired or the data has never been cached.
• Solution: Use a mutex lock or distributed lock to prevent concurrent requests from accessing the database at the same time.

Cache Penetration

• Definition: A malicious or incorrect request attempts to access a file that does not exist in the database at all data, resulting in cache and database failure.
• Cause: Constructing a non-existent query by traversing or exploiting a vulnerability.
• Solution: Perform parameter verification on the request and filter out non-existent query conditions.

Difference

Features	Cache Penetration	Cache Penetration
Cache status	Data does not exist or has expired	Data does not exist
Trigger factors	Concurrent access	Malicious or incorrect requests
Level of harm	Performance decreases, database pressure increases	Increased database pressure and potential security risks
Solution	Mutual exclusion lock/distributed lock	Parameter verification

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