Hubert (depesz) Lubaczewski • 1/6/2026

What is index overhead on writes?

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This article presents a detailed benchmark test in PostgreSQL 18, measuring the write performance overhead of adding indexes. It tests COPY operations on a wide table with up to 21 indexes, reporting load times, total data size, and speed degradation. The results quantify how increasing indexes non-linearly slows down writes, providing practical insights for database optimization.

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#postgresql #Database Indexing #Data Loading
What is index overhead on writes?

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