Interviewer: If databases use indexes to speed up queries, why not index every column?

Byali

May 7, 2026 #SQL

The question sounds naive. The answer reveals everything about how databases actually work under load.

Interviewer: If databases use indexes to speed up queries, why not index every column? The question sounds naive. The answer reveals everything about how databases actually work under load.Continue reading on Medium » Read More Sql on Medium

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M	T	W	T	F	S	S
				1	2	3
4	5	6	7	8	9	10
11	12	13	14	15	16	17
18	19	20	21	22	23	24
25	26	27	28	29	30	31

Interviewer: If databases use indexes to speed up queries, why not index every column?

Byali

By ali

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The $2.3M Bug Was a Missing Index. We Didn’t Find It for 11 Days.

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