必须定期执行该命令，以便优化器利用最新的数据制定有效的计划来抓取数据。
This command has to be executed periodically so that the optimizer has the latest data with it to come to an effective plan to fetch the data.
必须定期执行该命令，以便优化器利用最新的数据制定有效的计划来抓取数据。
This command has to be executed periodically so that the optimizer has the latest data with it to come to an effective plan to fetch the data.
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