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I am improving the database tables by adding indexes where appropriate.
I’d like to add indexes to attributes that are used on GROUP_BY queries.
Is there a way to automagically know which fields were used by GROUP_BY?
I don’t see that there’s a correlation between GROUP BY performance and the presence of indexes. If you have a query that runs slowly then I’d look to see indexes on the columns you have a predicate or a join on first of all.