HDB Exclusive Locked

Some Desigo CC functions require exclusive access. The database is locked exclusively in this case. No further data is saved to the History Database during this period. The database is exclusively locked for the following functions:

  • Purge
  • Increase database
  • Upgrade
  • Delete for more storage
  • Emergency delete

In these cases, incoming history data is automatically saved to temporary storage on the Desigo CC server. Data stored to temporary storage is automatically added to the History Database as soon as it becomes available. At the same time, new data is saved temporarily until all data has been added to the History Database.

HDB Exclusive Locked Diagram

 

NOTE:
This mechanism ensures that no history data is lost during normal operation.