System Design - zero-downtime
#01 Schema Migration
The Migration That Broke Production Premium
ALTER TABLE on 400M rows. It locks. Everything downstream times out. You learn about online schema migration the hard way.
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#02 Zero Downtime
Deploy at 4:59 PM on a Friday: Zero-Downtime Deployments That Actually Work Premium
A senior engineer pushes a small fix right before the weekend. By 5:05 PM the on-call phone rings. Zero-downtime deployments suddenly matter a lot.
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