Sharded Is Not Distributed: What You Should Know When PostgreSQL Is Not Enough

One year ago, we published the post “When PostgreSQL is not enough: PostgreSQL vs distributed system performance comparison” . PostgreSQL showed exceptional performance in scenarios where service availability and data durability were not a priority. We called this configuration “fault-intolerant but extremely performant PostgreSQL.” However, performance drops significantly once write-ahead logging (WAL) and replication are enabled. Replication can become a bottleneck, limiting the system‘s ability to scale