查询限制策略Query throttling policy

• 10/30/2020
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定义查询限制策略以限制群集同时执行的并发查询的数量。Define the query throttling policy to limit the amount of concurrent queries the cluster is executing at the same time. 策略可以在运行时更改，在 alter policy 命令完成后立即进行。The policy can be changed at run-time and takes place immediately after the alter policy command completes.

• 使用 .show cluster policy querythrottling 显示群集的当前查询限制策略。Use .show cluster policy querythrottling to show the current query throttling policy of a cluster.
• 使用 .alter cluster policy querythrottling 设置群集的当前查询限制策略。Use .alter cluster policy querythrottling to set the current query throttling policy of a cluster.
• 使用 .delete cluster policy querythrottling 删除群集的当前查询限制策略。Use .delete cluster policy querythrottling to delete current query throttling policy of a cluster.