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3min chapter
Queues in Postgres
Postgres FM
The Importance of Skip Locked in Bloke Management
skip for updates is a very cool feature, but it's needed when you when one worker is not enough. In general, the advice is try to have index only scans. Here, Auto vacuum should be tuned again, because we want hip fetches to be as low as possible - ideal is zero all the time in practice. To have real index only scan, we need to keep Auto vacuum quite aggressive and know which pages are marked or all visible. So if they are marked all visible, index only scan can avoid consulting to heap and deal only with index.
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