https://thecodersblog.com/tag/nosql/Recent content in NoSQL on The Coders BlogHugoen-usWed, 06 May 2026 22:26:38 +0000https://thecodersblog.com/azure-cosmos-db-production-lessons-2026-2026/Wed, 06 May 2026 22:26:38 +0000https://thecodersblog.com/azure-cosmos-db-production-lessons-2026-2026/<p>You provisioned Azure Cosmos DB with ample Request Units (RUs), your application&rsquo;s P99 latency is creeping up, and throttling errors are becoming more frequent. Sound familiar? This isn&rsquo;t a capacity problem; it&rsquo;s a design problem. The Azure Cosmos DB Conference 2026 made one thing brutally clear: the platform exposes your data modeling and partition key choices like a harsh spotlight.</p> <h2 id="the-unseen-bottleneck-partition-keys-and-skewed-distribution">The Unseen Bottleneck: Partition Keys and Skewed Distribution</h2> <p>The single most impactful decision you make for Cosmos DB is the partition key. Forget throwing more RUs at the problem; if your partition key leads to skewed distribution, you&rsquo;re battling hot partitions. This results in 100% RU utilization on some physical partitions while others languish, leading to relentless throttling and unacceptable latency spikes, even if your aggregate RU usage appears low.</p>