You might have noticed the row estimates (599 and 28,458) are lower than you'd expect for a 50-million-row table. The planner checks the actual physical file size. Our table is only 74 pages on disk, not the 123,513 we injected. Hence the planner scales reltuples down proportionally. The absolute numbers shrink, but the ratios between them stay correct, and it's the ratios that determine plan shape. When you use pg_dump --statistics-only in practice, you're typically restoring into a database with comparable data volume, so the estimates align naturally.
The FOMO factor
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your database structure. It supports SELECT, INSERT, UPDATE, DELETE, and DDL
4、为什么“龙虾”的扩散路径很特别如果仔细观察龙虾的传播路径，会发现它和过去十年的互联网产品完全不同。