Hi I am new to grails and was wondering how does grails handle the DB connectivity? We are using GORM and was wondering if GORM/Grails does retries or connection retries when a read operation fails due to lost connection to DB

Yes, prior to Grails 7 it used https://tomcat.apache.org/tomcat-9.0-doc/jdbc-pool.html and for Grails 7 this switched to https://github.com/brettwooldridge/HikariCP, by default. Many used HikariCP prior to 7.