What is cache hit ratio and why is it important?

What is cache hit ratio and why is it important?

Cache hit ratio is the percentage of cache accesses that result in a hit, meaning the data is found in the cache. It's important because a higher ratio indicates better performance, reducing the time needed to access data from slower storage.

How do you calculate the cache hit ratio?

You calculate it by dividing the number of cache hits by the total number of cache accesses (hits + misses) and then multiplying by 100 to get a percentage.

What factors can affect the cache hit ratio?

Factors include cache size, the algorithm used for cache management, the workload characteristics, and the access patterns of the data.

Can a low cache hit ratio be improved?

Yes, it can be improved by increasing cache size, optimizing cache algorithms, or modifying the data access patterns.

What tools can I use to monitor cache hit ratio?

You can use performance monitoring tools like Prometheus, Grafana, or built-in monitoring features in databases and web servers.