1. A system, comprising: a master data server, to maintain a master database at a data server, the master database comprising master data objects, the master database accessible to clients comprising a first client and a second client; an integration server, in response to a request from the first client to access master data identified by a first client identifier, to map the first client identifier to a master identifier, retrieve a master data object from the master database based on the master identifier, and map the master data object to a mapped data object based on a set of mapping rules associated with the first client, wherein the master data object has a plurality of attributes associated with characteristics of an entity represented by the master data object, the first client processes a first subset of the plurality of attributes, the second client processes a second subset of the plurality of attributes, the first subset being different from the second subset, and a mapping table to store information related to mapping of client identifiers to master identifiers, the first client identifier from the client identifiers identifying the master data object in the first client, a second client identifier from the client identifiers identifying the master data object in the second client, and the master identifier from the master identifiers identifying the master data object in the master data server.