Shadow system mirroring of an original system during uptime of an upgrade process

摘要

A computer system can include a program database module configured to define, at a shadow system, a shadow program database having a structure defining an upgrade to a structure of an original program database on an original system, and having data defining an upgrade to data of the original program database on the original system. The computer system can include a customization upgrade module configured to select the data of the shadow program database based on a data customization implemented in the original program database of the original system, and configured to define an upgraded program state of the shadow program database based on a combination of the structure of the shadow program database and the data of the shadow program database.