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This, as a few other commenters have mentioned, is a terrible article.

For a start, the article does not mention any other database. I don't know how you can say something is read or write heavy without comparing it to something else. It doesn't even compare different queries on the same database. Like, they just wrote a query and it does a lot of reads - so what? There's nothing here. Am I going mad? Why does this article exist?

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A little context may be of help. Maybe a better headline for the article would have been, "How Can You Determine if your PostgreSQL Instance's Workload is Read-Heavy or Write-Heavy?" It's useful to know to help optimize settings and hardware for your workload as well as to nkow whether an index might be useful or not. Most major DBMSs will have some way to answer this question, the article is aimed at PostgreSQL only.

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