# Monitoring your Amazon Neptune global database using CloudWatch metrics
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Neptune supports the following CloudWatch metrics that you can use to monitor a Neptune global database:
+ **`GlobalDbDataTransferBytes`**   –   The number of bytes of redo log data transferred from the primary Amazon Web Services Region to a secondary Amazon Web Services Region in a Neptune global database.
+ **`GlobalDbReplicatedWriteIO`**   –   The number of write I/O operations replicated from the primary Amazon Web Services Region in the global database to the cluster volume in a secondary Amazon Web Services Region.

  The billing calculations for each DB cluster in a Neptune global database use the `VolumeWriteIOPS` metric to account for writes performed within that cluster. For the primary DB cluster, the billing calculations use `NeptuneGlobalDbReplicatedWriteIO` to account for the cross-region replication to secondary DB clusters.
+ **`GlobalDbProgressLag`**   –   The number of milliseconds that a secondary cluster is behind the primary cluster for both user transactions and system transactions.


| Metric | Dimension | Published in | Units | 
| --- | --- | --- | --- | 
| `GlobalDbDataTransferBytes` | SourceRegion, DBClusterIdentifier | Secondary | Bytes | 
| `GlobalDbReplicatedWriteIO` | SourceRegion, DBClusterIdentifier | Secondary | Count | 
| `GlobalDbProgressLag` | DBClusterIdentifier, SecondaryRegion : in Primary DBClusterIdentifier, SourceRegion : in Secondary | Primary, Secondary | Milliseconds |