修正你的统计数据。如果规划器低估了行数，它会在何时溢出到磁盘的决策上犯错。运行ANALYZE，检查pg_stats和pg_statistic。如果你的列值存在相关性（这违反了更高的范式，本身也是数据模型设计的问题），使用CREATE STATISTICS来捕捉相关性。通过ALTER TABLE ... ALTER COLUMN ... SET STATISTICS增加每列的目标统计信息值，仅在列值彼此独立时有所帮助。
James Trew for Engadget
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