針對 Azure Cosmos DB for NoSQL 的進階診斷查詢問題進行疑難排解

文章
08/15/2024

適用於： NoSQL

在本文中，我們將探討如何使用傳送至 Azure 診斷 (舊版) 和資源專用 (預覽) 資料表的診斷記錄，撰寫更進階的查詢，協助針對 Azure Cosmos DB 帳戶的問題進行疑難排解。

Azure 診斷資料表的所有資料皆會寫入單一資料表中。使用者指定要查詢的類別。若要檢視要求的全文檢索查詢，請參閱使用 Azure 中的診斷設定來監視 Azure Cosmos DB 資料，了解如何啟用這項功能。

資源專屬資料表的資料會寫入該資源各類別的個別資料表。建議採用此模式，因為：

使用資料時更方便。
可更深入探索結構描述。
同時改善擷取延遲及查詢時間兩者的效能。

常用查詢

資源專屬及 Azure 診斷資料表會顯示常用查詢。

let topRequestsByRUcharge = CDBDataPlaneRequests 
| where TimeGenerated > ago(24h)
| project  RequestCharge , TimeGenerated, ActivityId;
CDBQueryRuntimeStatistics
| project QueryText, ActivityId, DatabaseName , CollectionName
| join kind=inner topRequestsByRUcharge on ActivityId
| project DatabaseName , CollectionName , QueryText , RequestCharge, TimeGenerated
| order by RequestCharge desc
| take 10

let topRequestsByRUcharge = AzureDiagnostics
| where Category == "DataPlaneRequests" and TimeGenerated > ago(24h)
| project  requestCharge_s , TimeGenerated, activityId_g;
AzureDiagnostics
| where Category == "QueryRuntimeStatistics"
| project querytext_s, activityId_g, databasename_s , collectionname_s
| join kind=inner topRequestsByRUcharge on activityId_g
| project databasename_s , collectionname_s , querytext_s , requestCharge_s, TimeGenerated
| order by requestCharge_s desc
| take 10

在特定時間範圍內節流的要求 (statusCode = 429)

資源專屬
Azure 診斷

let throttledRequests = CDBDataPlaneRequests
| where StatusCode == "429"
| project  OperationName , TimeGenerated, ActivityId;
CDBQueryRuntimeStatistics
| project QueryText, ActivityId, DatabaseName , CollectionName
| join kind=inner throttledRequests on ActivityId
| project DatabaseName , CollectionName , QueryText , OperationName, TimeGenerated

let throttledRequests = AzureDiagnostics
| where Category == "DataPlaneRequests" and statusCode_s == "429"
| project  OperationName , TimeGenerated, activityId_g;
AzureDiagnostics
| where Category == "QueryRuntimeStatistics"
| project querytext_s, activityId_g, databasename_s , collectionname_s
| join kind=inner throttledRequests on activityId_g
| project databasename_s , collectionname_s , querytext_s , OperationName, TimeGenerated

回應長度 (伺服器回應的承載大小) 最大的查詢

資源專屬
Azure 診斷

let operationsbyUserAgent = CDBDataPlaneRequests
| project OperationName, DurationMs, RequestCharge, ResponseLength, ActivityId;
CDBQueryRuntimeStatistics
//specify collection and database
//| where DatabaseName == "DBNAME" and CollectionName == "COLLECTIONNAME"
| join kind=inner operationsbyUserAgent on ActivityId
| summarize max(ResponseLength) by QueryText
| order by max_ResponseLength desc

let operationsbyUserAgent = AzureDiagnostics
| where Category=="DataPlaneRequests"
| project OperationName, duration_s, requestCharge_s, responseLength_s, activityId_g;
AzureDiagnostics
| where Category == "QueryRuntimeStatistics"
//specify collection and database
//| where databasename_s == "DBNAME" and collectioname_s == "COLLECTIONNAME"
| join kind=inner operationsbyUserAgent on activityId_g
| summarize max(responseLength_s1) by querytext_s
| order by max_responseLength_s1 desc

實體分割區 (複本集的所有複本) 的 RU 耗用量

資源專屬
Azure 診斷

CDBPartitionKeyRUConsumption
| where TimeGenerated >= now(-1d)
//specify collection and database
//| where DatabaseName == "DBNAME" and CollectionName == "COLLECTIONNAME"
// filter by operation type
//| where operationType_s == 'Create'
| summarize sum(todouble(RequestCharge)) by toint(PartitionKeyRangeId)
| render columnchart

AzureDiagnostics
| where TimeGenerated >= now(-1d)
| where Category == 'PartitionKeyRUConsumption'
//specify collection and database
//| where databasename_s == "DBNAME" and collectioname_s == "COLLECTIONNAME"
// filter by operation type
//| where operationType_s == 'Create'
| summarize sum(todouble(requestCharge_s)) by toint(partitionKeyRangeId_s)
| render columnchart

邏輯分割區 (複本集的所有複本) 的 RU 耗用量

資源專屬
Azure 診斷

CDBPartitionKeyRUConsumption
| where TimeGenerated >= now(-1d)
//specify collection and database
//| where DatabaseName == "DBNAME" and CollectionName == "COLLECTIONNAME"
// filter by operation type
//| where operationType_s == 'Create'
| summarize sum(todouble(RequestCharge)) by PartitionKey, PartitionKeyRangeId
| render columnchart

AzureDiagnostics
| where TimeGenerated >= now(-1d)
| where Category == 'PartitionKeyRUConsumption'
//specify collection and database
//| where databasename_s == "DBNAME" and collectioname_s == "COLLECTIONNAME"
// filter by operation type
//| where operationType_s == 'Create'
| summarize sum(todouble(requestCharge_s)) by partitionKey_s, partitionKeyRangeId_s
| render columnchart

下一步

如需有關如何為 Azure Cosmos DB 建立診斷設定的詳細資訊，請參閱建立診斷設定。
如需有關如何使用 Azure 入口網站、Azure CLI 或 PowerShell 建立診斷設定的詳細資訊，請參閱建立診斷設定以收集 Azure 中的平台記錄和計量。

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