Hi, @Sathish.Balasundaram: In order to change the slow query threshold in the New Relic user interface (as Holly has shown above), you must enable server-side configuration for your application. Otherwise, you may change the setting in your New Relic configuration file.
Please note that server-side configuration is not available for the PHP or Go language agents. For those languages, you must change the setting in the configuration file. For more information, please see this document: https://docs.newrelic.com/docs/agents/manage-apm-agents/configuration/configure-agent.