| 摘要 |
The backup server in the backup site receives messages multicast from business servers in the primary site, extracts the business data, and stores it in backup databases for each business server. Upon this storing of business data, the sequence numbers in the messages are added to the business data to be stored in the backup databases. Detection of loss in sequence numbers allows the detection of which piece of the business data is lost. The backup server does not request a business server in the primary site to retransmit data even when business data is partially lost, but instead directly requests the database server in the primary site to transmit the lost business data.
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