本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# 授予 Performance Insights 的精細存取
<a name="USER_PerfInsights.access-control.dimensionAccess-policy"></a>

精細存取控制可提供額外的方式，讓您控制對您 Performance Insights 的存取。此存取控制可以允許或拒絕存取 `GetResourceMetrics`、`DescribeDimensionKeys` 和 `GetDimensionKeyDetails` Performance Insights 動作的個別維度。若要使用精細存取，請使用條件索引鍵在 IAM 政策中指定維度。存取的評估遵循 IAM 政策評估邏輯。如需詳細資訊，請參閱 * IAM User Guide* 中的 [Policy evaluation logic](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_evaluation-logic.html)。如果 IAM 政策陳述式未指定任何維度，則陳述式會控制對指定動作之所有維度的存取。如需可用維度的清單，請參閱 [https://docs.aws.amazon.com/performance-insights/latest/APIReference/API_DimensionGroup.html](https://docs.aws.amazon.com/performance-insights/latest/APIReference/API_DimensionGroup.html)。

若要了解您的憑證獲授權可存取的維度，請使用 `ListAvailableResourceDimensions` 中的 `AuthorizedActions` 參數並指定動作。`AuthorizedActions` 的允許值如下所示：
+ `GetResourceMetrics`
+ `DescribeDimensionKeys`
+ `GetDimensionKeyDetails`

例如，如果您將 `GetResourceMetrics` 指定為 `AuthorizedActions` 參數，則 `ListAvailableResourceDimensions` 會傳回 `GetResourceMetrics` 動作獲授權可存取的維度清單。如果您在 `AuthorizedActions` 參數中指定多個動作，則 `ListAvailableResourceDimensions` 會傳回這些動作獲授權可存取的維度交集。

**Example**  
下列範例提供 `GetResourceMetrics` 和 `DescribeDimensionKeys` 動作指定維度的存取權。    
****  

```
{
    "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"
                    ]
                }
            }
        }
        

    ]
}
```
以下是所請求維度的回應：  

```
	// 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" }
                ] 
            }
            
        ] }
    ]
}
```
下列範例會指定維度的一個允許和兩個拒絕存取。    
****  

```
{
    "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"
                    ]
                }
            }
        }
    ]
}
```
以下是所請求維度的回應：  

```
			// 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" }
                ] 
            },
            ...
        ] }
    ]
}
```