The cache key

  • Fix
  • Cache 09

Difficulty 2 of 5

Tracking parameters create 100 raw keys for each product. The small cache hits only about 3 percent of raw keys. Reach a 90 percent hit ratio and keep p99 below 150 ms. Do not change the requests.

0:00. The cache hit ratio is near 3 percent. Graph: database reads track total reads almost exactly.

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 30 USD/mo
Parts you can add
Redis cache
Part limit
16
Edit limit
3
Traffic
5,000 req/s

Concepts

How players did

Player results load from the server.

All levels