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\n当您的业务将面对突发或计划中的流量高峰时，您可以使用云数据库 Redis的带宽弹性伸缩功能。该功能将实时检测带宽使用率，当网络带宽使用率达到阈值后自动增加实例带宽，在流量高峰过去后，该功能也支持自动缩回实例带宽。

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前提条件

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功能概述

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由于不同实例规格对应的带宽存在差异，如果流量超过了带宽上限，可能会导致阻塞，从而影响服务性能。您可以开启带宽弹性伸缩功能来避免此类情况。与变更实例规格相比，调整带宽可以帮助您迅速提升带宽，节约整体费用，并且不会引发连接的中断，实现即开即用。

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操作步骤

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  1. 登陆百度云Redis控制台，进入实例列表，然后单击目标实例ID。
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  2. 配置信息中您可以看到实例当前的最大带宽。如果实例为集群架构或读写分离架构，此处展示的是实例整体的最大带宽（即所有数据节点的带宽之和）。
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  3. 在配置信息区域框，单击带宽MB/s后的变更，进入到带宽变更页面。
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  4. 变更类型勾选自动弹性扩缩，即可设置带宽弹性伸缩策略。
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类别参数说明
自动带宽扩展自动带宽扩展单击打开该功能。
带宽使用率大于等于触发带宽自动扩展的带宽使用率阈值，单位：百分比。支持的取值：50-90。
观测窗口带宽弹性扩展的观测窗口，单位：分钟。支持的取值：1-30。
自动带宽回缩自动带宽回缩单击打开该功能。
带宽使用率小于触发带宽自动回缩的带宽使用率阈值，单位：百分比。支持的取值：10-30。
观测窗口带宽弹性回缩的观测窗口，单位：分钟。支持的取值：10-30。
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  1. 确认调整信息后，勾选我已阅读并同意《云数据库Redis服务等级协议SLA》，点击确认变更，完成订单支付即可发起带宽变更任务。
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