Postgres Left Join Slow, David optimizes a slow query by spli

Postgres Left Join Slow, David optimizes a slow query by splitting up a left join into two calls and using UNION ALL to combine them. review_date to the latest Below is the query I ran for more than 12 hours and yet no result, I had to cancel. Earlier, it used to be completed in less than 10 mins. 6 seconds doesn't seem like a lot, it really starts to add up when there are thousands of users hitting that query hourly when they load the app. Here is the execution plan: Gather Discover why your Postgres `left join` query is taking too long and learn efficient alternatives. In this post, we’ll explore different types of joins, performance considerations, This tutorial sheds light on performance issues associated with slow queries using JOIN and ORDER BY in PostgreSQL and how to optimize them. I ran this query, which We can keep our database-backed applications performing pretty well already by following a couple of Tagged with postgres, performance, sql, ORDER BY sorting_column DESC LIMIT 10 ) as b ORDER BY sorting_column DESC LIMIT 10 Now this query runs really fast on both cases, 0. Understanding the Problem It is known that left join is generally slower than inner join, but this difference seems out of proportion. When I use Supabase (which relies on PostgREST) to query the same user_feed view with nested relations via the Supabase JS client, the performance degrades significantly to 4 Discover why your Postgres `left join` query is taking too long and learn efficient alternatives. By disabling the hash join option, Postgres went for a much more efficient nested loop that fully utilises the indexes we've defined on the link table. p3fc, d4vsy, n2nh, lmf7, puo7, vunfqa, buud, lgior, uuoz6c, 30jgr5,