Hit ratio

  • Tune
  • Level 8 of 41
  • Cache

Difficulty 1 of 5

One million keys have Zipf popularity 1. Each entry uses 1,000 bytes of value and 60 bytes of key. Reach a 90 percent hit ratio. Buy only the RAM you need.

Play level

HTTP/2SQLUsers5,000 req/sRedis cache0.25 vCPU · 0.5 GBPostgres0.5 vCPU · 1 GB
HTTP/2SQLUsers5,000 req/sRedis cache0.25 vCPU · 0.5 GBPostgres0.5 vCPU · 1 GB
The board at the start of the level
Cache size and hit ratioDrag or use arrow keys to change the cache size

1,600 keys · hit 81% · mean 3.2 ms

Goals and limits

Hit ratio
at least 90%
p99 latency
under 150 ms
Monthly cost
under 12 USD/mo
Traffic
5,000 req/s

Concepts

How players did

Player results load from the server.

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