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• When the POS server recovers from a breakdown (in the backup server system):
When the POS Server recovers from a breakdown, the system temporarily stops all communication
between each client and the POS Server. Then the POS server merges the database of the backup server
into its own. After the recovery process is complete, the client will be allowed to access the POS server.
Backup
server
Transaction
database
Preset
database
Backup
server
Transaction
database
Preset
database
POS server
Merge
Transaction
database
Upload
Preset
database
POS server
Merge
Transaction
database
Upload
Preset
database
Upload (update)
Local transaction
Download
Download
Upload (update)
Upload (update)
Local transaction
Download
Client
Registration
database
Preset
database
Client
Registration
database
Preset
database
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