# 授予 Performance Insights 精细访问权限
<a name="USER_PerfInsights.access-control.dimensionAccess-policy"></a>

精细访问控制功能提供用于控制对 Performance Insights 的访问的其他方法。此访问控制功能可以允许或拒绝对 `GetResourceMetrics`、`DescribeDimensionKeys` 和 `GetDimensionKeyDetails` Performance Insights 操作的各个维度的访问。要使用精细访问功能，请使用条件键在 IAM 策略中指定维度。访问权限的评估遵循 IAM 策略评估逻辑。有关更多信息，请参阅《IAM 用户指南》**中的[策略评估逻辑](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_evaluation-logic.html)。如果 IAM 策略声明未指定任何维度，该声明将控制对指定操作的所有维度的访问。有关可用维度的列表，请参阅 [https://docs.aws.amazon.com/performance-insights/latest/APIReference/API_DimensionGroup.html](https://docs.aws.amazon.com/performance-insights/latest/APIReference/API_DimensionGroup.html)。

要找出您的凭证有权访问的维度，请使用 `ListAvailableResourceDimensions` 中的 `AuthorizedActions` 参数并指定操作。允许的 `AuthorizedActions` 值如下所示：
+ `GetResourceMetrics`
+ `DescribeDimensionKeys`
+ `GetDimensionKeyDetails`

例如，如果您为 `AuthorizedActions` 参数指定 `GetResourceMetrics`，`ListAvailableResourceDimensions` 将返回 `GetResourceMetrics` 操作有权访问的维度列表。如果您在 `AuthorizedActions` 参数中指定了多个操作，`ListAvailableResourceDimensions` 将返回这些操作有权访问的维度的交集。

**Example**  
以下示例提供了对 `GetResourceMetrics` 和 `DescribeDimensionKeys` 操作的指定维度的访问权限。    
****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
        {
            "Sid": "AllowToDiscoverDimensions",
            "Effect": "Allow",
            "Action": [
                "pi:ListAvailableResourceDimensions"
            ],
            "Resource": [
                "arn:aws:pi:us-east-1:123456789012:metrics/rds/db-ABC1DEFGHIJKL2MNOPQRSTUV3W"
            ]
        },
        {
            "Sid": "SingleAllow",
            "Effect": "Allow",
            "Action": [
                "pi:GetResourceMetrics",
                "pi:DescribeDimensionKeys"
            ],
            "Resource": [
                "arn:aws:pi:us-east-1:123456789012:metrics/rds/db-ABC1DEFGHIJKL2MNOPQRSTUV3W"
            ],
            "Condition": {
                "ForAllValues:StringEquals": {
                    "pi:Dimensions": [
                        "db.sql_tokenized.id",
                        "db.sql_tokenized.statement"
                    ]
                }
            }
        }
        

    ]
}
```
以下是对所请求维度的响应：  

```
	// ListAvailableResourceDimensions API
// Request
{
    "ServiceType": "RDS",
    "Identifier": "db-ABC1DEFGHIJKL2MNOPQRSTUV3W",
    "Metrics": [ "db.load" ],
    "AuthorizedActions": ["DescribeDimensionKeys"]
}

// Response
{    
    "MetricDimensions": [ {
        "Metric": "db.load",
        "Groups": [
            {
                "Group": "db.sql_tokenized",
                "Dimensions": [
                    { "Identifier": "db.sql_tokenized.id" },
                  //  { "Identifier": "db.sql_tokenized.db_id" }, // not included because not allows in the IAM Policy
                    { "Identifier": "db.sql_tokenized.statement" }
                ] 
            }
            
        ] }
    ]
}
```
以下示例为维度指定一个允许访问和两个拒绝访问权限。    
****  

```
{
    "Version":"2012-10-17",		 	 	 
    "Statement": [
          {
            "Sid": "AllowToDiscoverDimensions",
            "Effect": "Allow",
            "Action": [
                "pi:ListAvailableResourceDimensions"
            ],
            "Resource": [
                "arn:aws:pi:us-east-1:123456789012:metrics/rds/db-ABC1DEFGHIJKL2MNOPQRSTUV3W"
            ]
          },

          {
            "Sid": "O01AllowAllWithoutSpecifyingDimensions",
            "Effect": "Allow",
            "Action": [
                "pi:GetResourceMetrics",
                "pi:DescribeDimensionKeys"
            ],
            "Resource": [
                "arn:aws:pi:us-east-1:123456789012:metrics/rds/db-ABC1DEFGHIJKL2MNOPQRSTUV3W"
            ]
        },
        
        {
            "Sid": "O01DenyAppDimensionForAll",
            "Effect": "Deny",
            "Action": [
                "pi:GetResourceMetrics",
                "pi:DescribeDimensionKeys"
            ],
            "Resource": [
                "arn:aws:pi:us-east-1:123456789012:metrics/rds/db-ABC1DEFGHIJKL2MNOPQRSTUV3W"
            ],
            "Condition": {
                "ForAnyValue:StringEquals": {
                    "pi:Dimensions": [
                        "db.application.name"
                    ]
                }
            }
        },
        
        {
            "Sid": "O01DenySQLForGetResourceMetrics",
            "Effect": "Deny",
            "Action": [
                "pi:GetResourceMetrics"
            ],
            "Resource": [
                "arn:aws:pi:us-east-1:123456789012:metrics/rds/db-ABC1DEFGHIJKL2MNOPQRSTUV3W"
            ],
            "Condition": {
                "ForAnyValue:StringEquals": {
                    "pi:Dimensions": [
                        "db.sql_tokenized.statement"
                    ]
                }
            }
        }
    ]
}
```
以下是对请求维度的响应：  

```
			// ListAvailableResourceDimensions API
// Request
{
    "ServiceType": "RDS",
    "Identifier": "db-ABC1DEFGHIJKL2MNOPQRSTUV3W",
    "Metrics": [ "db.load" ],
    "AuthorizedActions": ["GetResourceMetrics"]
}

// Response
{    
    "MetricDimensions": [ {
        "Metric": "db.load",
        "Groups": [
            {
                "Group": "db.application",
                "Dimensions": [
                
                  // removed from response because denied by the IAM Policy
                  //  { "Identifier": "db.application.name" }  
                ]
            },
            {
                "Group": "db.sql_tokenized",
                "Dimensions": [
                    { "Identifier": "db.sql_tokenized.id" },
                    { "Identifier": "db.sql_tokenized.db_id" },
                    
                  // removed from response because denied by the IAM Policy
                  //  { "Identifier": "db.sql_tokenized.statement" }
                ] 
            },
            ...
        ] }
    ]
}
```

```
// ListAvailableResourceDimensions API
// Request
{
    "ServiceType": "RDS",
    "Identifier": "db-ABC1DEFGHIJKL2MNOPQRSTUV3W",
    "Metrics": [ "db.load" ],
    "AuthorizedActions": ["DescribeDimensionKeys"]
}

// Response
{    
    "MetricDimensions": [ {
        "Metric": "db.load",
        "Groups": [
            {
                "Group": "db.application",
                "Dimensions": [
                  // removed from response because denied by the IAM Policy
                  //  { "Identifier": "db.application.name" }  
                ]
            },
            {
                "Group": "db.sql_tokenized",
                "Dimensions": [
                    { "Identifier": "db.sql_tokenized.id" },
                    { "Identifier": "db.sql_tokenized.db_id" },
                    
                  // allowed for DescribeDimensionKeys because our IAM Policy 
                  // denies it only for GetResourceMetrics
                    { "Identifier": "db.sql_tokenized.statement" }
                ] 
            },
            ...
        ] }
    ]
}
```