Hi Vipin,
Here are couple of old tickets which should answer your question:
- https://support.gluu.org/identity-management/3783/integration-with-mysql-cache-refresh/
- https://support.gluu.org/authentication/3434/syncing-gluu-users-with-database/
- https://support.gluu.org/customization/3428/gluu-engine-database-support/
- https://support.gluu.org/authentication/3369/additional-fee-for-sync-with-sql-database-with-username-password/