Abstract: Techniques for operating an archival database, referred to as a historian, are disclosed. Embodiments of the invention provide techniques for synchronizing historical archive files and/or archival data between a primary and a secondary historian used to archive data values from a real-time database. The real-time database may be used to monitor the current operational state of a large industrial system, such as a pipeline. In turn, the historian may be used to archive the data stored by the real-time database. In the event that either the primary or the secondary system (or both) goes down and then comes back online at a later time, embodiments of the invention may be used to synchronize data between the primary and secondary historian systems.

Abstract: Techniques for operating an archival database, referred to as a historian, are disclosed. Embodiments of the invention provide techniques for synchronizing historical archive files and/or archival data between a primary and a secondary historian used to archive data values from a real-time database. The real-time database may be used to monitor the current operational state of a large industrial system, such as a pipeline. In turn, the historian may be used to archive the data stored by the real-time database. In the event that either the primary or the secondary system (or both) goes down and then comes back online at a later time, embodiments of the invention may be used to synchronize data between the primary and secondary historian systems.