MySQL Top File IO Test

This test auto-discovers the top files that are I/O intensive and for each file, reports the wait time and the read/write latency. Using this test, administrators can figure out the file that is experiencing slowness due to high read and write latencies.

Target of the test : A MySQL server

Agent deploying the test : An internal/remote agent

Outputs of the test : One set of results for every file in the target MySQL Database instance

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 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 server. To know how to create such a user, refer to Pre-requisites for Monitoring the MySQL Server topic.
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 database server is not SSL-enabled by default. To enable the test to connect to an SSL-enabled MySQL database server , set the SSL flag to Yes.
Verify CA	If the eG agent is required to establish an encrypted connection with the target MySQL database 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 database 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.

Measurements made by the test
Measurement	Description	Measurement Unit	Interpretation
Waits count	Indicates the number of waits recorded on this file during the last measurement period.	Number
Average Wait time	Indicates the average time spent by a query per wait to fetch data from this file during the last measurement period.	Seconds/Wait
Minimum wait time	Indicates the minimum time spent by a query per wait to fetch data from this file during the last measurement period.	Seconds/Wait
Maximum wait time	Indicates the maximum time spent by a query per wait to fetch data from this file during the last measurement period.	Seconds/Wait	Ideally, the value of this measure should be low. A sudden/gradual increase in the value of this measure is a cause of concern. Compare the value of this measure across indexes to identify the file that is experiencing maximum wait time.
Average read latency	Indicates the average time taken to read from this file during the last measurement period.	Seconds/Read
Minimum read latency	Indicates the minimum time taken to read from this file during the last measurement period.	Seconds/Read
Maximum read latency	Indicates the maximum time taken to read from this file during the last measurement period.	Seconds/Read	Ideally, the value of this measure should be low. A sudden/gradual increase in the value of this measure is a cause of concern. Compare the value of this measure across indexes to identify the file that is experiencing maximum read latency.
Average write latency	Indicates the average time taken to write into this file during the last measurement period.	Seconds/Write
Minimum write latency	Indicates the minimum time taken to write into this file during the last measurement period.	Seconds/Write
Maximum write latency	Indicates the maximum time taken to write into this file during the last measurement period.	Seconds/Write	Ideally, the value of this measure should be low. A sudden/gradual increase in the value of this measure is a cause of concern. Compare the value of this measure across indexes to identify the file that is experiencing maximum write latency.