MySQL Cluster Connection Test

This test provides information about client connections to each node in the target MySQL Cluster database server.

Target of the test : A MySQL Cluster

Agent deploying the test : A remote agent

Outputs of the test : One set of results for each node in the target MySQL Cluster database server being monitored

Configurable parameters for the test
Parameter Description

Test Period

How often should the test be executed.

Host

The host for which the test is to be configured.

Port

The port at which the specified host listens.

Database

Specify the name of a database on the target MySQL Cluster database server being monitored

Username and Password

The eG agent has to be configured with the credentials of a user who has server-wide Process and Select privileges on the monitored MySQL Cluster database server. To know how to create such a user, refer to Pre-requisites for Monitoring the MySQL Cluster Database Server topic.

Confirm Password

Confirm the password by retyping it here.

Measurements made by the test
Measurement Description Measurement Unit Interpretation

Maximum connection limit

Indicates the maximum number of connections that can be opened on this node.

Number

 

Connection usage

Indicates the percentage utilization of the connections on this node.

Percent

 

Opened connections

Indicates the number of currently open connections on this node.

Number

A high value may be indicative of connections not being closed properly by applications, or a bottleneck in the server.

Connection aborts

Indicates the number of connections that were aborted because the client terminated without closing the connection properly on this node during the last measurement period.

Number

 

Connection create rate

Indicates the rate at which applications attempted to connect to this node during the last measurement period.

Connections/Second

The data transmission rate reflects the workload on the each node on the cluster database server.

Failed connections

Indicates the number of connection attempts to this node that failed during the last measurement period.

Number

A high value can indicate:

  • a configuration problem with the server/clients;

  • some malicious attack on the server;

Maximum connections

Indicates the maximum number of connections that were simultaneously in use on this node during the last measurement period.

Number