PGCon 2011

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Database Scalability Patterns: Sharding for Unlimited Growth

Most people have come to understand simple replication based horizontal scale-out, but while this technique works pretty well for some read loads, there are system where either the amount of data involved is too great for a single system, or the write based load goes beyond the capacity of a single machine. In these cases we must turn to complex systems of federated databases to build database systems that can sustain perpetual growth.

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