Hitachi, Ltd.

Hitachi Microcomputer System, Ltd.

Youichi Yamamoto

Yoshito Kamegi

Susumu Kobayashi

Masato Asami

Tomoto Shimizu

Masashi Tsuchida

Norihiro Hara

Miyoko Namioka

Kazuhiro Satoh

Keiji Moki

Hiromichi Ogata

In a database system of a client-server arrangement, a database server operating in a server outputs data to a storage device. Here, the data stores in a database that is requested by a user application operating in a client. The user application refers to the storage device to which the data is outputted, to obtain the data. Thereby, the data managed by the database server is passed to an application at high speed in the database system.

Method and system for managing database having a capability of passing data, and medium relevant thereto

A newly defined data type is added to a database management system. Information about a query component assisting in querying data belonging to the newly defined data type is registered along with data type information in a query component information. If the data type being queried is the newly added data type, the query component information is searched to find a query component for assisting queries to data belonging to the particular data type. The matching query component is activated and a screen is displayed to input information needed to the query data belonging to the data type. The information is input and a query statement is generated using the inputted information. The generated query statement is issued to the database management system and query results are obtained.

Method for querying a database in which a query statement is issued to a database management system for which data types can be defined

A newly defined data type is added to a database management system. Information about a query component assisting in querying data belonging to the newly defined data type is registered along with data type information in a query component information. If the data type being queried is the newly added data type, the query component information is searched to find a query component for assisting queries to data belonging to the particular data type. The matching query component is activated and a screen is displayed to input information needed to query data belonging to the data type. The information is input and a query statement is generated using the inputted information. The generated query statement is issued to the database management system and query results are obtained.

A user defined ADT function (to be implemented by an embedded module assigned to the function) is executed with module calling triggers other than the execution of the ADT function described in an SQL statement in a database management method which allows the user to define a data type. By creating a proper execution procedure command package, an embedded module implementing an ADT function can be executed even if the function is defined in a format to return execution results as a set. The database processing method includes an ADT function analysis for selecting a procedural model for creating a proper execution procedure command package in accordance with an evaluation style and a non-ADT function called embedded module analysis for adding information on embedded modules called on module calling triggers other than execution of ADT functions. Examples of module calling triggers other than execution of ADT functions include module calling triggers specified by embedded module defining information which includes the evaluation style of the embedded module in addition to the module calling triggers.

Execution of user defined ADT function implemented by embedded module in

An object-oriented data base management system connected to a plurality of data bases includes a class definition unit, a static inheritance processing unit included within the class definition unit, a message processing unit, a dynamic inheritance processing unit included within the message processing unit, and an object management unit. The object-oriented data base management system is of the type that defines the inheritance relationship between a plurality of classes and an arbitrary class and the inheritance priority order, the class being a basic unit of programming, and executes the data processing by solving the inheritance relationship between classes in accordance with the priority order. There is prepared, for each class, updatable inheritance solution status information which the static inheritance processing unit causes to be stored in a table. The inheritance solution status information includes status information and time information. The status information is representative of whether or not inheritance between the class and the superclasses can be completely solved, and the time information is representative of a time when the status is established. When a message processing is requested for an object of a class, the dynamic inheritance processing unit searches the method designated by the message while referring to the inheritance solution status information regarding the class and the superclass stored in the table.

System of object oriented inheritance using the temporal status of

In a processing system having a plurality of CPUs, a common storage device is shared by all the CPUs, online control programs are executed by the CPUs, and monitor programs monitor the states of the online control programs and control the online control programs. When a failure of an online control program occurs, the process of the failed online control program can be taken over by another online control program. A method of recovering from the failure of an online control program is characterized by quick restart information for each online control program which is stored separately in the common storage device and separate from a log.

System for recovering failure of online control program with another

In an online system having processors which execute a plurality of online jobs, a standby processor is provided along with a wait job which is executed by this processor and which has organization information of a logical sum of organization information items of the plurality of online jobs. When a failure has occurred as to any of the online jobs, only the organization information item of the failed online job within the organization information of the wait job is left valid. Thereafter, a process of the failed online job is switched to and executed by the wait job.

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Machida, Japan

Youichi Yamamoto