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748 [Translation] Whose feature is better, or how to compare the efficiency of SQL query plans

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melanny20 (Postgres Professional) @ Habr 3 place · 06/16/2025 07:00 EDT

[Translation] Whose feature is better, or how to compare the efficiency of SQL query plans

How to compare the efficiency of SQL query plans? “Measure the execution time, of course!” — an experienced reader would say. And they would be absolutely right: from a practical perspective, the more efficient DBMS is the one that delivers higher TPS. However, sometimes we need to design a system that doesn't exist yet or predict behavior under loads that haven't occurred yet. In such cases, we need a characteristic that allows us to perform a qualitative analysis of a plan or compare two plans. This post.

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