Backup system, backup method, database apparatus, and backup apparatus

A database apparatus having a plurality of databases, comprising:

• update information generating means for generating, with respect to the individual databases, update information indicating contents of updates of the databases;
• interrelation information generating means for generating interrelation information indicating an interrelation between the update information for a certain database and the update information for other databases;
• and
• transmitting means for transmitting the update information and the interrelation information to a backup apparatus.

A backup method for a database apparatus having a plurality of databases, comprising:

• an update information generation step of generating, with respect to the individual databases, update information indicating contents of updates of the databases;
• an interrelation information generation step of generating interrelation information indicating an interrelation between the update information for a certain database and the update information for other databases;
• and
• a transmission step of transmitting the update information and the interrelation information to a backup apparatus.

A program for causing a computer to function as a database apparatus having a plurality of databases, wherein said computer functions as:

• update information generating means for generating, with respect to the individual databases, update information indicating contents of updates of the databases;
• interrelation information generating means for generating interrelation information indicating an interrelation between the update information for a certain database and the update information for other databases;
• and
• transmitting means for transmitting the update information and the interrelation information to a backup apparatus.

A backup apparatus for holding a backup of information stored in a database apparatus, comprising:

• receiving means for receiving update information and interrelation information transmitted from the database apparatus;
• backup databases for holding backups of contents of databases owned by the database apparatus;
• interrelation determining means for looking up the interrelation information received by said receiving means to determine the interrelation of each said update information;
• and
• updating means for updating said backup databases based on the update information of which the interrelation is verified by said interrelation determining means.

A backup method enabling backup databases to hold a backup of information stored in a database apparatus, comprising:

• a reception step of receiving update information and interrelation information transmitted from the database apparatus;
• an interrelation determination step of looking up the interrelation information received in said reception step to determine the interrelation of each said update information;
• and
• an update step of updating the backup databases based on the update information of which the interrelation is verified in said interrelation determination step.

A program for causing a computer to perform a process of holding a backup of information stored in a database apparatus, wherein said program causes the computer to function as:

• receiving means for receiving update information and interrelation information transmitted from the database apparatus;
• backup databases for holding backups of contents of databases owned by the database apparatus;
• interrelation determining means for looking up the interrelation information received by the receiving means to determine the interrelation of each said update information;
• and
• updating means for updating the backup databases based on the update information of which the interrelation is verified by the interrelation determining means.