注意：规划器要求maintenance_work_mem ≥ 64MB以启用并行索引构建。内存不足时，构建静默回退到串行模式。
Amazon’s Smart Air Quality Monitor is on sale for $49.99 ($20 off) at Amazon, just $5 shy of its best price to date. The budget-friendly gizmo can track your indoor air quality and send alerts via Alexa when it worsens. You can also set up Alexa Routines so that compatible devices — including air purifiers, dehumidifiers, and fans — automatically turn on or off in response. Read our review.，这一点在snipaste截图中也有详细论述
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