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Read replicas allow databases to handle more read requests by distributing them across multiple copies.

Database replication helps keep data available and allows systems to handle more read requests.

Database replication enhances data availability and read performance but has challenges like replication lag.

Synchronous replication waits for confirmation from replicas, while asynchronous allows faster writes without waiting.

Primary shards partition data, while replica shards duplicate it for redundancy.

Cross-region database replication keeps databases synchronized across different geographical locations.

Elasticsearch CCR allows real-time data replication for faster disaster recovery.

Hinted Handoff allows a database to manage temporary replica failures by storing missed write operations.