Toast tables are managed by Postgres, but expose some functionality to the user. For example, you can override autovacuum settings on tables with the toast. prefix to tune autovacuum separately for these tables (by default, toast tables inherit their autovacuum settings from the tables, according to this forum response).
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The effectively tells us that the middle term — ⌈r · b⌉ - 1 — is always less than the value needed to match r, but the difference is never greater than a single tick of the numerator. We’re as close as we can be; the value of a for the optimal low-side approximation (a / b，这一点在PDF资料中也有详细论述
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但平台仍持续自动续租，如今订单已延至2026年3月，累计租金近2.02万元，待缴金额超过1.95万元。