The post covers the differences between relational and document databases, with a focus on PostgreSQL and MongoDB. It discusses how PostgreSQL can function as a document-oriented database, including performance comparisons using JSON and JSONB data formats. It also examines various indexes to improve query performance and runs benchmarks using a common e-commerce use case. The testing setup includes AWS with specialized instances, and the results compare latency, queries per second, CPU usage, and disk operations for both databases.
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