Snowflake中仓库重复停复工的信用使用

Question

我很好奇 usage/credits/cost 在一分钟内多次恢复和暂停仓库的影响（无论是手动还是自动发生）。

Snowflake 文档对于这种极端情况有些含糊不清。

The credit numbers shown here are for a full hour of usage; however, credits are billed per-second, with a 60-second (i.e. 1-minute) minimum:

Each time a warehouse is started or resized to a larger size, the warehouse is billed for 1 minute’s worth of usage based on the hourly rate shown above.

Stopping and restarting a warehouse within the first minute does not change the amount billed; the minimum billing charge is 1 minute.

来自How are Credits Charged for Warehouses?：

When warehouses are provisioned:

The minimum billing charge for provisioning a warehouse is 1 minute (i.e. 60 seconds).

There is no benefit to stopping a warehouse before the first 60-second period is over because the credits have already been billed for that period.

After the first 60 seconds, all subsequent billing for a running warehouse (until it is shut down). Three examples are provided below:

If a warehouse runs for 30 to 60 seconds, it is billed for 60 seconds.

If a warehouse runs for 61 seconds, it is billed for only 61 seconds.

If a warehouse runs for 61 seconds, shuts down, and then restarts and runs for less than 60 seconds, it is billed for 121 seconds (60 + 1 + 60).

我正在寻找的示例如下：

如果一个仓库运行10秒，关机，然后立即重启，再运行10秒：
- 是否按 60 秒计费？
- 还是按120秒（60+60）计费？

我假设是后者，但我想确定一下。

Answer 1

create warehouse timetest2 WAREHOUSE_SIZE = XSMALL INITIALLY_SUSPENDED = TRUE;
use warehouse timetest2;

alter warehouse timetest2 RESUME;

select sum(random()) 
from table(generator(TIMELIMIT => 10));

alter warehouse timetest2 SUSPEND;

最后三个步骤完成两次，暂停 5 秒。

select start_time, 
    warehouse_name, 
    credits_used_compute, 
    round(credits_used_compute * 60,3) as minutes_billed
from table(information_schema.warehouse_metering_history(dateadd('hour',-1,current_timestamp)));

START_TIME	WAREHOUSE_NAME	CREDITS_USED_COMPUTE	MINUTES_BILLED
2022-04-16 15:32:36.000 -0700	TIMETEST2	0.033333333	2
2022-04-16 15:32:36.000 -0700	TIMETEST	0.033333333	2

做了两次，以防第一次草率。如前所述，它似乎是按分钟计费。

Answer 2

只是运行一些测试，结果很清楚：

每次重新启动仓库（无论上下文或上次暂停时间），都会产生 60 秒的最低费用。

我用中型仓库测试（每分钟 4/60 学分）：

恢复 6 次，间隔分钟：0.40 学分
同一分钟内恢复 6 次：0.40 积分

Snowflake中仓库重复停复工的信用使用

Credit usage of repetitive warehouse suspension & resumption in Snowflake

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