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。

# 使用 Amazon CloudWatch 監控 Aurora DSQL
<a name="cloudwatch-monitoring"></a>

使用 CloudWatch 監控 Aurora DSQL 時，其會收集原始資料並將資料處理成可讀且近乎即時的指標。CloudWatch 會保留這些統計資料 15 個月，協助您更深入了解 Web 應用程式或服務效能。設定警示以監控特定閾值，並在符合條件時傳送通知或採取動作。檢閱下列適用於 Aurora DSQL 的用量和可觀測性指標。

如需更多資訊，請參閱 [Amazon CloudWatch 使用者指南](https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/)。

## 可觀測性和效能
<a name="observability-performance"></a>

此表格概述 Aurora DSQL 的可觀測性指標。其包含用於追蹤唯讀及總交易的指標，以提供整體工作負載特徵分析。將查詢逾時和 OCC 衝突率等可操作的指標都包含在內，以協助識別效能問題及並行衝突。與工作階段相關的指標，包括作用中及總體指標，可深入了解系統目前的負載。


| CloudWatch 指標名稱 | 指標 | 單位 | 說明 | 
| --- |--- |--- |--- |
| ReadOnlyTransactions | Read-only transactions | none | The number of read-only transactions | 
| TotalTransactions | Total transactions | none | The total number of transactions executed on the system, including read-only transactions. | 
| QueryTimeouts | Query timeouts | none | The number of queries which have timed out due to hitting the maximum transaction time | 
| OccConflicts | OCC conflicts | none | The number of transactions aborted due to key level OCC | 
| CommitLatency | Commit Latency | milliseconds | Time spent by commit phase of query execution (P50) | 
| BytesWritten | Bytes Written | bytes | Bytes written to storage | 
| BytesRead | Bytes Read | bytes | Bytes read from storage | 
| ComputeTime | QP compute time | milliseconds | QP wall clock time | 
| ClusterStorageSize | Cluster Storage Size | bytes | Cluster size | 

## 用量指標
<a name="usage-metrics"></a>

 Aurora DSQL 使用稱為分散式處理單元 (DPU) 的單一標準化計費單位，測量所有請求型的活動，例如查詢處理、讀取及寫入。


| CloudWatch 指標名稱 | 指標 | 維度：ResourceId | 單位 | 說明 | 
| --- |--- |--- |--- |--- |
| WriteDPU | Write Units | <cluster-id> | DPU | Approximates the write active-use component of your Aurora DSQL cluster DPU usage. | 
| MultiRegionWriteDPU | Multi-Region Write Units | <cluster-id> | DPU | Applicable for Multi-Region clusters: Approximates the multi-Region write active-use component of your Aurora DSQL cluster DPU usage. | 
| ReadDPU | Read Units | <cluster-id> | DPU | Approximates the read active-use component of your Aurora DSQL cluster DPU usage. | 
| ComputeDPU | Compute Units | <cluster-id> | DPU | Approximates the compute active-use component of your Aurora DSQL cluster DPU usage. | 
| TotalDPU | Total Units | <cluster-id> | DPU | Approximates the total active-use component of your Aurora DSQL cluster DPU usage. | 

## CDC 串流指標
<a name="cdc-stream-metrics"></a>

Aurora DSQL 會發佈變更資料擷取 (CDC) 串流的下列指標。這些指標使用 `ClusterId`和 `StreamId`維度，因此您可以獨立監控每個 CDC 串流。如需 CDC 串流的詳細資訊，請參閱[變更資料擷取 (CDC) 串流](https://docs.aws.amazon.com/aurora-dsql/latest/userguide/cdc-streams.html)。


| CloudWatch 指標名稱 | 指標 | 單位 | 說明 | 
| --- |--- |--- |--- |
| IsImpaired | Is impaired | none | Indicates whether the stream is impaired. The value is 1 when the stream is in the 受損 state, and 0 when the stream is healthy. Use this metric to create a CloudWatch alarm that notifies you when a stream becomes impaired. | 
| PublishedBytes | Published bytes | bytes | The total number of bytes that Aurora DSQL wrote to the target Kinesis data stream. | 
| PublishedRecords | Published records | none | The number of CDC records that Aurora DSQL wrote to the target Kinesis data stream. | 
| BehindSourceLag | Behind source lag | milliseconds | The delay, in milliseconds, between when a transaction commits in Aurora DSQL and when the CDC system processes the resulting record. A rising value indicates that the CDC pipeline is falling behind the write workload. If lag grows beyond the failure threshold, the stream transitions to 失敗. | 
| BytesStreamed | Bytes streamed | bytes | The total bytes streamed through the CDC pipeline for billing purposes. This metric reflects the data volume used to calculate streaming charges. | 
| StreamDPU | Stream DPU | DPU | The Distributed Processing Units (DPU) consumed by the CDC stream. This metric reflects the processing cost of streaming change data. |