Abstract: A database retrieval system includes a retrieval condition input unit for inputting database retrieval conditions in a plurality of retrieval modes different from each other, an integration condition acceptance unit for inputting integration conditions for combining a plurality of database retrieval conditions input through the retrieval condition input unit, an integrated retrieval condition generation unit for integrating retrieval conditions input by the retrieval condition input unit according to integration conditions input by the integration condition acceptance unit, and a retrieval execution unit for retrieving a database according to retrieval conditions integrated by the integrated retrieval condition generation unit.

Abstract: A method and a system of database divisional management for use with a parallel database system comprising an FES (front end server), BES's (back end servers), an IOS (I/O server) and disk units. The numbers of processors assigned to the FES, BES's and IOS, the number of disk units, and the number of partitions of the disk units are determined in accordance with the load pattern in question. Illustratively, there may be established a configuration of one FES, four BES's, one IOS and eight disk units. The number of BES's is varied from one to four depending on the fluctuation in load, so that a scalable system configuration is implemented. When the number of BES's is increased or decreased, only the management information thereabout is transferred between nodes and not the data, whereby the desired degree of parallelism is obtained for high-speed query processing.

Abstract: A method for building an objectbase of persistent objects, includes naming an objectbase collection of objects, naming each object relative to a first collection of objects using a first key, assigning, to each new object to be added to the objectbase collection, a second key, generating a third key from the first and second keys, storing each object with the associated keys generating a reference to each object in the objectbase collection from the third key and one or more system identifiers, creating an instance of an object collection in a database client, identifying a class of each object in the object collection to the instance collection, generating a stream class for persistence of element objects, identifying to the instance collection a mapping between its attributes that are persistent and the corresponding database fields, identifying to the instance collection access control information in the form of one or more predicates, and activating the element objects using the stream.