Not open yet
Level 6 opens after you complete Level 5: pass the hot-shard incident in any one set.
Level 6 builds on it: it assumes you already know sharding, hot keys and why one database cannot take every write.
Level 6 opens after you complete Level 5: pass the hot-shard incident in any one set.
Level 6 builds on it: it assumes you already know sharding, hot keys and why one database cannot take every write.