DDM Instance Metrics

Description

This section describes metrics reported by DDM to Cloud Eye, metric namespaces, and dimensions. You can use APIs provided by Cloud Eye to query the metric information generated for DDM.

Namespace

SYS.DDMS

SYS.DDM is the namespace of DDM 1.0.

SYS.DDMS is the namespace of DDM 2.0.

DDM has been upgraded to version 2.0. The namespace is still SYS.DDM for existing users of DDM1.0.

Metrics

**Table 1** DDM metrics
Metric ID	Metric Name	Description	Value Range	Monitored Object	Monitoring Interval (Raw Data)
ddm_cpu_util	CPU Usage	CPU usage of the DDM instance node	0—100	DDM nodes	1 minute
ddm_mem_util	Memory Usage	Memory usage of the DDM instance node.	0—100	DDM nodes	1 minute
ddm_bytes_in	Network Input Throughput	Incoming traffic per second of the DDM instance node	≥ 0	DDM nodes	1 minute
ddm_bytes_out	Network Output Throughput	Outgoing traffic per second of the DDM instance node	≥ 0	DDM nodes	1 minute
ddm_qps	QPS	Requests per second of the DDM instance node	≥ 0	DDM nodes	1 minute
ddm_read_count	Reads	Read operations of the DDM instance node within each monitoring period	≥ 0	DDM nodes	1 minute
ddm_write_count	Writes	Write operations of the DDM instance node within a monitoring period	≥ 0	DDM nodes	1 minute
ddm_slow_log	Slow SQL Logs	Slow SQL logs of DDM-Core	≥ 0	DDM nodes	1 minute
ddm_rt_avg	Average Response Latency	Average response latency of DDM-Core	≥ 0	DDM nodes	1 minute
ddm_connections	Connections	Connections of DDM-Core	≥ 0	DDM nodes	1 minute
ddm_backend_connection_ratio	Percentage of Active Connections	Percentage of active connections (from a DDM node to the target RDS instance)	0—100	DDM nodes	1 minute
active_connections	Active connections	Active connections of each DDM instance node	≥ 0	DDM nodes	1 minute
ddm_connection_util	Connection Usage	Percentage of active connections to each DDM instance node	0—100	DDM nodes	1 minute
ddm_node_status_alarm_code	DDM Node Connectivity	Whether each DDM instance node is unavailable. The value can be 0 and 1. 0 indicates that the node is available, and 1 indicates that the node is unavailable.	0 or 1	DDM nodes	1 minute
ddm_global_sequence_threshold_exceeded_count	Global Secondary Sequences Beyond Threshold	Number of global sequences whose usage exceeds 75%. Usage = Current value/Maximum value. The default threshold is 75%. The maximum value of a global sequence depends on the global sequence type. For example, the maximum value of BIGINT is 2^63-1.	≥ 0 counts	DDM instances	10 minutes