Uber handles trillions of transactions by evolving from a monolithic application to a microservices architecture using Postgres and MySQL. They developed their own immutable ledger system called Ledger Store, which sits above existing NoSQL databases, ensuring the integrity of financial transactions. Key features include sealing, manifest for security, and the use of Apache Kafka for real-time data streaming. They managed a complex database migration with minimal disruption by employing strategies like checkpointed data processing and the Shadow Rider system for simultaneous database operations.
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