创建数据库大概用了5分钟。
导入官方测试Weather Data用了1分钟。
感觉太重了，不够轻量。
另外 CrateDB Cloud 实例如果14天无活动就会被删除。
因此不作为免费建站资源，但他们用于大型数据分析还是蛮不错的。
https://cratedb.com/docs/cloud/en/latest/tutorials/quick-start.html
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The “FREE” cluster can be started without providing payment details. You can use one free cluster per organization.
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The cluster will be suspended if not used for 4 consecutive days, and will be deleted after an additional 10 days of inactivity.
