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DDM Instance Metrics

Updated on 2024-07-30 GMT+08:00

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

NOTE:

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

Dimensions

Key

Value

instance_id

DDM instance ID

node_id

DDM node ID

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