Did you use deployer for installing db connect on search head clusters? If you didn't use, you may need to configure with deployer. First, install db connect on deployer and configure apps. Next, copy db connect dir to $SPLUNK_HOME/etc/shcluster/apps/ dir. Finally, deploy the configuration bundle by running the splunk apply and rolling restart shc. For details, please read splunk document. https://docs.splunk.com/Documentation/DBX/3.6.0/DeployDBX/Distributeddeployment#Deploy_DB_Connect_on_search_head_clusters
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