Patent ID: 6356916
Filing Date: 2002-03-12
Classification: G06F,Y10S

Abstract:
A replica system having:a first database; first data management means for managing the first database; a second database; second data management means for managing the second database; and a replica controller for producing replicas of data between said first and second databases, said replica controller comprising: replica management means for receiving a replica instruction, and, according to the replica instruction, determining an object to be read from one of said first and second databases and an object to be written in the one of said first and second databases from which the object is not read; first interface means, giving a command to said first data management means when the object is to be read from said first database, for reading from said first database data associated with the object to be read, and converting format of the data read into a standardized data format specified in said system, and for, when the object is to be written into said first database, converting the format of data to be written into said first database from the standardized data format specified in said system into the data format associated with the object to be written into said first database, and writing the data in the converted format into said first database by giving a command to said first data management means; and second interface means for, when the object is to be written into said second database, receiving data in the standardized data format from said first interface means, converting the format of the data into a data format associated with the object to be written into said second database, and writing the data in the converted format into said second database by giving a command to said second data management means, and, when the object is to be read from the second database, giving a command to said second data management means for reading from said second database data associated with said object to be read, and converting the format of the data read from said second database into the standardized data format specified in said system.