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Scaling databases · designlab

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Part 1 · Module 9

Scaling databases

Read replicas and replication lag, failover and backups, and sharding when one primary can no longer hold the data or the writes.

0 of 4 lessons25 min

9.1Read replicasUp next7m
9.2Failover, durability and backups6m
9.3Sharding6m
9.4Connections and query load6m
LabThe database is the bottleneckFinish “Dinner launch” first30m

Practice what this module teaches

News Feed HLDBuild a feed for millions of readers, from everyday posts to celebrity fan-out.Advanced50 min Multi-region Failover HLDDefine write ownership, recovery objectives and split-brain prevention across regions.Advanced55 min Backup and Restore Platform

HLD

Create verifiable recovery points and prove they restore in an isolated environment.

Advanced55 min

Live Shard Rebalancing Service HLDMove key ranges between owners with snapshot catch-up, enforced epochs and directory cutover.Advanced60 min