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Could you extend this to say that, If I have an Index on column A, and a need arises to add a compound index (A,B), the index A should be dropped? If reusing an index improves cache efficiency, and (A,B) fully optimizes, A, then it seems like an additional index on A would waste space and potentially slow things down

jvans
– jvans

2019-04-02 17:05:25 +00:00
Commented Apr 2, 2019 at 17:05
1

@jvans: Generally true - with notable exceptions and alternatives. I added a paragraph to address that.

Erwin Brandstetter
– Erwin Brandstetter

2019-04-02 17:32:52 +00:00
Commented Apr 2, 2019 at 17:32

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