IAM では、ロールの付与や権限の拒否などのアクセス権の変更には結果整合性があります。つまり、アクセス権の変更がシステム全体に反映されるまで時間がかかります。しばらくの間は、最近のアクセス権の変更がすべての場所で有効になるとは限りません。たとえば、最近取り消されたロールや最近拒否された権限を引き続き使用できる場合があります。また、最近付与されたロールや、最近まで使用を拒否されていた権限を使用できないこともあります。
[[["わかりやすい","easyToUnderstand","thumb-up"],["問題の解決に役立った","solvedMyProblem","thumb-up"],["その他","otherUp","thumb-up"]],[["わかりにくい","hardToUnderstand","thumb-down"],["情報またはサンプルコードが不正確","incorrectInformationOrSampleCode","thumb-down"],["必要な情報 / サンプルがない","missingTheInformationSamplesINeed","thumb-down"],["翻訳に関する問題","translationIssue","thumb-down"],["その他","otherDown","thumb-down"]],["最終更新日 2025-09-04 UTC。"],[[["\u003cp\u003eIAM access changes, such as granting or denying permissions, are eventually consistent, meaning they don't take effect immediately across the entire system.\u003c/p\u003e\n"],["\u003cp\u003eThe time it takes for access changes to propagate varies depending on the method used, with policy changes typically taking around 2 minutes, potentially longer, and group membership changes taking several minutes to potentially hours.\u003c/p\u003e\n"],["\u003cp\u003eChanging a principal's access through group membership changes typically propagates faster than changes made via nested group memberships.\u003c/p\u003e\n"],["\u003cp\u003eAdding a principal to a group generally results in faster propagation of access changes than removing a principal from a group.\u003c/p\u003e\n"]]],[],null,["# Access change propagation\n\nIn IAM, access changes, such as granting a role or denying a\npermission, are [eventually consistent](https://wikipedia.org/wiki/Eventual_consistency). This means that it takes time for access changes to propagate\nthrough the system. In the meantime, recent access changes might not be effective\neverywhere. For example, principals might still be able to use a recently\nrevoked role or a recently denied permission. Alternatively, they might not be\nable to use a recently granted role or a permission they were, until recently,\ndenied from using.\n\nThe amount of time it takes for an access change to propagate depends on how you\nmake the access change:\n\nAlso keep in mind the following details for how group membership changes\npropagate:\n\n- In general, adding a principal to a group propagates faster than removing a principal from a group.\n- In general, group membership changes propagate faster than nested group membership changes.\n\nYou can use these propagation time estimates to inform the way you modify your\nprincipals' access."]]