# Managing devices with AWS IoT {% hint style="info" %} This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/aws-iot-docs.git) {% endhint %} ## How to manage things with the registry * **Note**\ We don't recommend using personally identifiable information in your thing names. ## Thing types * **Note**\ You must wait five minutes after you deprecate a thing type before you can delete it. ## Static thing groups * **Note**\ We don't recommend using personally identifiable information in your thing group names. * **Important**\ Keep in mind the following limits when creating thing group hierarchies:\ A thing group can have only one direct parent. The number of direct child groups a thing group can have is [limited](https://docs.aws.amazon.com/general/latest/gr/iot_device_management.html#thing-group-limits). The maximum depth of a group hierarchy is [limited](https://docs.aws.amazon.com/general/latest/gr/iot_device_management.html#thing-group-limits). The number of attributes a thing group can have is [limited](https://docs.aws.amazon.com/general/latest/gr/iot_device_management.html#thing-group-limits). (Attributes are name-value pairs you can use to store information about a group.) The lengths of each attribute name and each value are also [limited](https://docs.aws.amazon.com/general/latest/gr/iot_device_management.html#thing-group-limits). * **Important**\ You can add a thing to a maximum of 10 groups. But you can't add a thing to more than one group in the same hierarchy. (In other words, you can't add a thing to two groups which share a common parent.)\ If a thing belongs to as many thing groups as possible, and one or more of those groups is a dynamic thing group, you can use the flag to make static groups take priority over dynamic groups. * **Note**\ This operation is [eventually consistent](https://web.stanford.edu/class/cs345d-01/rl/eventually-consistent.pdf). In other words, changes to the thing group might not be reflected immediately. * **Note**\ This operation is [eventually consistent](https://web.stanford.edu/class/cs345d-01/rl/eventually-consistent.pdf). In other words, changes to the thing group might not be reflected immediately. * **Note**\ The number of attributes that a thing can have is [limited](https://docs.aws.amazon.com/general/latest/gr/iot_device_management.html#thing-limits). * **Important**\ If you try to delete a thing group that has child thing groups, you receive an error: * **Important**\ You can attach a maximum number of two policies to a group. * **Note**\ We don't recommend using personally identifiable information in your policy names. ## Dynamic thing groups * **Note**\ We don't recommend using personally identifiable information in your dynamic thing group names. * **Note**\ After you create a dynamic thing group, you can use the group, regardless of its status. Only dynamic thing groups with an `ACTIVE` status include all of the things that match the search query for that dynamic thing group. Dynamic thing groups with `BUILDING` and `REBUILDING` statuses might not include all of the things that match the search query. * **Note**\ If you have permissions to query the fleet index, you can access the data of things across the entire fleet. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://awsnotes.dendron.so/internet-of-things-iot/aws-iot-device-management/topics/managing-devices-with-aws-iot.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.