# Amazon CloudWatch dimensions for Aurora
<a name="dimensions"></a>

You can filter Aurora metrics data by using any dimension in the following table.


|  Dimension  |  Filters the requested data for . . .  | 
| --- | --- | 
|  DBInstanceIdentifier  |  A specific DB instance.  | 
|  DBClusterIdentifier  |  A specific Aurora DB cluster.  | 
|  DBClusterIdentifier, Role |  A specific Aurora DB cluster, aggregating the metric by instance role (WRITER/READER). For example, you can aggregate metrics for all READER instances that belong to a cluster.  | 
|  DbClusterIdentifier, EngineName  |  A specific Aurora DB cluster and engine name combination. For example, you can view the `VolumeReadIOPs` metric for cluster `ams1` and engine `aurora`.  | 
|  DatabaseClass  |  All instances in a database class. For example, you can aggregate metrics for all instances that belong to the database class `db.r5.large`.  | 
|  EngineName  |  The identified engine name only. For example, you can aggregate metrics for all instances that have the engine name `aurora-postgresql`.  | 
|  SourceRegion  |  The specified Region only. For example, you can aggregate metrics for all DB instances in the `us-east-1` Region.  |