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  5. Christophe Pettus: All Your GUCs in a Row: bgwriter_lru_maxpages and bgwriter_lru_multiplier
Christophe Pettus: All Your GUCs in a Row: bgwriter_lru_maxpages and bgwriter_lru_multiplier
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Christophe Pettus: All Your GUCs in a Row: bgwriter_lru_maxpages and bgwriter_lru_multiplier

These two parameters close out the bgwriter cluster. Together with bgwriter_delay, they govern how the background writer decides what to write each round, and they are where the actual leverage lives — the previous post ended by saying so…

DevelopmentPlanet PostgreSQLPublished: May 17, 2026
Development
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Christophe Pettus: All Your GUCs in a Row: bgwriter_delay and bgwriter_flush_after

The B cluster shifts gears: from one-off oddities to the background writer parameters, which span four GUCs. We do the first two as a pair because bgwriter_delay introduces the process at all, and bgwriter_flush_after slots cleanly into…

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