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Category: Hot Spots

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pg_stats.correlation Is Not a Monotonic Index Detector

Jim KnicelyJune 22, 2026

Some columns naturally move in one direction as new rows are inserted. Think timestamps, event times, sequence values, or identity columns. These […]

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Use pg_stats to Spot Low-Cardinality Index Hotspots Before They Spot You

Jim KnicelyJune 20, 2026

When migrating from PostgreSQL to YugabyteDB, table load time is only part of the story. Secondary indexes can become the real bottleneck. […]

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Choosing the Right Primary Key to Avoid Write Hotspots

Jim KnicelyMarch 30, 2026

When you move from a single-node database to a distributed system like YugabyteDB, one design decision suddenly matters a lot more: 👉 […]

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Detecting Hot Shards in YSQL with SQL

Jim KnicelySeptember 23, 2025

Hot shards happen when too many rows land in a small subset of tablets. That subset becomes a bottleneck while other tablets […]

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