In this project to replace Gwangju Bank's Unix-based core computing system with a Linux-based one in response to the increase in online transaction volume and the discontinuation of product sales and technical support from manufacturers, LGCNS adopted and applied OpenPOP Query Delta—which has been verified through use in projects such as Jeonbuk Bank's next-generation system, Suhyup Bank's DW enhancement, and Hana Bank's next-generation system—to prepare for and support various variables arising from changes in Gwangju Bank's accounting system operating platform and database operating environment. LGCNS is proactively checking, comparing, analyzing, and improving SQL performance changes, and providing support to ensure stable DB/SQL performance in the new database environment.