MySQL Cluster Connections Test

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

Target of the test : A MySQL Cluster

Agent deploying the test : An external agent

Outputs of the test : One set of results for each node on 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	Specify Host name of the server for which the test is to be configured in this text box.
Port	Specify the port to which the specified host listens in this text box.
Database(DB)	Specify the name of a database on the target MySQL Cluster database server being monitored in the Database text box.
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 in the Username and Password text boxes. To know how to create such a user, refer to Pre-requisites for Monitoring the MySQL Cluster
Confirm Password	Confirm the Password by retyping it in the Confirm Password text box.
Allow Public Key	By default, the Allow Public Key flag is set to No. But, if the specified USER is created with caching_sha2_password as the authentication plugin, then the eG agent can connect to the target database cluster using RSA public key. To this effect, you have to set Allow Public Key flag to Yes.
SSL	By default, the SSL flag is set to No, indicating that the target MySQL Cluster server is not SSL-enabled by default. To enable the test to connect to an SSL-enabled MySQL Cluster server, set the SSL flag to Yes.
Verify CA	If the eG agent is required to establish an encrypted connection with the target MySQL Cluster server by authenticating the server's identity through verifying the server CA certificate, set Verify CA flag to Yes. By default, this flag is set to No.
Truststore Password	This parameter is applicable only if the Verify CA parameter is set to Yes. To verify the target server certificate, provide the password of the truststore file which contains the server CA certificate in the Truststore Password text box. By default, this parameter is set to none.
Confirm Password	Confirm the Password by retyping it in the Confirm Password text box.
Keystore Password	This parameter is applicable only if the Verify CA parameter is set to Yes. To establish a connection with the target MySQL Cluster server, the eG agent needs to have access to the client certificate. For this provide the password of the keystore file which contains the client certificate in the Keystore Password text box. By default, this parameter is set to none.
Confirm Password	Confirm the Password by retyping it in the Confirm Password text box.
Include Available Nodes	In the Include Available Nodes text box, provide a comma-separated list of all the available nodes to be included for monitoring. This way, the test monitor and collect metrics from all the available nodes in the cluster. By default, this parameter is set to none. The format of this configuration is: HOSTNAME:PORT, for example, 172.16.8.136:3306,172.16.8.139:3306

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	This measure is not reported for the Summary descriptor.
Connection usage	Indicates the percentage utilization of the connections on this node.	Percent	This measure is not reported for the Summary descriptor.
Connection create rate	The rate at which applications attempted to connect to this node during the last measurement period.	Connections/Sec	For the summary descriptor, this measure indicates the rate at which applications attempted to connect to the cluster.
Opened connections	The number of currently open connections to this node.	Number	A high value may be indicative of connections not being closed properly by applications, or a bottleneck in the server. For the summary descriptor, this measure indicates number of currently open connections on this cluster.
Connection aborts	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	For the summary descriptor, this measure indicates number of connections that were aborted because the client terminated without closing the connection properly on this cluster.
Failed connections	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; For the summary descriptor, this measure indicates number of connection attempts to this cluster that failed.
Maximum connections	The maximum number of connections that were simultaneously in use on this node during the last measurement period.	Number	For the summary descriptor, this measure indicates maximum number of connections that were simultaneously in use on this cluster.