Distributed database remote backup

Abstract

Generating, by a first primary site that is included in a group of primary sites of a distributed database system, a commit action redo log message for a commit action performed by the first primary site for a first database transaction, the commit action redo log message including a transaction ID for the first database transaction and a transaction order indicator that represents an order of database transactions in a group of database transactions performed at one or more primary sites of the group of primary sites; and sending, by the first primary site, the commit action redo log message, for a corresponding first standby site that backs up the first primary site.

1 . A method comprising:
 generating, by a first primary site that is included in a group of primary sites of a distributed database system, a commit action redo log message for a commit action performed by the first primary site for a first database transaction, the commit action redo log message including a transaction ID for the first database transaction and a transaction order indicator that represents an order of database transactions in a group of database transactions performed at one or more primary sites of the group of primary sites; and   sending, by the first primary site, the commit action redo log message, for a corresponding first standby site that backs up the first primary site.   
     
     
         2 . A first primary site included in a group of primary sites that participate in database transactions, comprising:
 a processing system comprising one or more processing units and one or more storage devices storing instructions that are operable, when executed by the one or more processing units, to cause the first primary site to perform operations comprising:
 generating a commit action redo log message for a commit action performed by the first primary site for a first database transaction, the commit action redo log message including a transaction ID for the first database transaction and a transaction order indicator that represents an order of database transactions in a group of database transactions performed at one or more primary sites of the group of primary sites; and 
 sending the commit action redo log message for a corresponding first standby site that backs up the first primary site.