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公开(公告)号：GB2296799A
公开(公告)日：1996-07-10
申请号：GB9500252
申请日：1995-01-06
Applicant: IBM
Inventor： PLATT MICHAEL , STANFORD-CLARK ANDREW JAMES , WALLIS GRAHAM DEREK
IPC: G06F17/30
Abstract: A system for processing requests from a client computer (300) for retrieval of data from a database (320) having a plurality of database servers (330, 450, 340, 350) on which data is stored, comprises: a storage means (430) for storing information identifying how the data is distributed across the plurality of database servers; a first processing means (440), interposed between the client computer (300) and the database (320), for receiving a request from the client computer in a standard query language, and with reference to the storage means (430), transforming the request into one or more constituent requests in the standard query language; and communication means (445; 415) for transmitting the constituent requests to the associated database servers. Additionally a second processing means (440; 410, 420) is arranged to receive the data sent from the database servers as a result of the constituent requests, and to assimilate that data as a single response for communication back to the client computer. This provide a high performance query server offering transparency to the client, heterogeneous operation, isolation between applications and data, and a choice of parallel architectures.
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Patent Agency Ranking
公开(公告)号：DE69531704D1
公开(公告)日：2003-10-09
申请号：DE69531704
申请日：1995-10-13
Applicant: IBM
Inventor： PLATT MICHAEL , STANFORD-CLARK JAMES
Abstract: According to the present invention, a transaction processing system is provided for executing transactional processes representing transactions, wherein the transaction processing functionality is integrated within a reduced kernel operating system such as a microkernel or nanokernel operating system. The system of the invention comprises a processor for executing the processes, and a main memory accessible to the processor for storing programs, including a reduced kernel operating system, to be executed by the processor. The main memory of the system has a supervisor area (510) where operating system functions forming the reduced kernel are stored, and a user area (520) where user programs and other operating system functions are stored. According to the present invention, a data structure (565, 570) is stored in the supervisor area (510) of main memory for storing information about the processes to be executed by the processor, and additionally the following operating system functions are stored in the supervisor area (510) of main memory: a scheduler (560) for applying a scheduling policy to determine the order in which processes identified in the table are provided to the processor for execution; a concurrency control manager (550) for managing the transactional processes to be executed by the system; and a message passing system (540) for passing messages between processes being executed by the processor, and for notifying the concurrency control manager (550) of any messages received by the message passing system from the transactional processes.
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公开(公告)号：GB2302966A
公开(公告)日：1997-02-05
申请号：GB9513402
申请日：1995-06-30
Applicant: IBM
Inventor： PLATT MICHAEL , STANFORD-CLARK ANDREW JAMES
Abstract: A transaction processing system is provided wherein the transaction processing functionality is integrated within a reduced kernel operating system such as a microkernel or nanokernel operating system. The system comprises a processor, and a main memory having a supervisor area (510) where operating system functions forming the reduced kernel are stored, and a user area (520) where user programs and other operating system functions are stored. Tables (565, 570) in the supervisor area (510) store information about the processes to be executed by the processor, and the following operating system functions are stored in the supervisor area (510): ```a scheduler (560) for applying a scheduling policy to determine the order in which processes identified in the table (565) are provided to the processor for execution; ```a concurrency control manager (550) for the transactional processes to be executed by the system; and ```a system (540) for passing messages between processes being executed by the processor, and for notifying the concurrency control manager (550) of any messages received by the message passing system from the transactional processes.
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公开(公告)号：GB2281793A
公开(公告)日：1995-03-15
申请号：GB9318877
申请日：1993-09-11
Applicant: IBM
Abstract: The present invention provides a data processing system, and method of operating such a system, for facilitating a connection of a program on a client computer to a server, the server consisting of a plurality of server computers with shared resources. The data processing system, the client computer, and the server computers all reside in a logical network. The data processing system has an input means for receiving a request from the client computer for a machine address of a server computer identified by a server computer name sent with the request, such a machine address enabling a connection to be made from the client computer to that server computer via the network. A storage device is provided by the system for storing a list identifying server computer names with machine addresses of the server computers. A conversion means in the system uses the list to convert the server computer name received by the input means into the machine address of the server computer, and then an output means sends the machine address from the conversion means to the client computer. The system is characterised by decision logic for studying the server computers at predetermined intervals having regard to a predetermined test criteria, in order to select one of the server computers; and writing means for updating the list by associating the machine address for the server computer selected by the decision logic with a particular server computer name contained as a generic server computer name in the list. Using this technique, when a client computer specifies the generic server computer name, it receives the machine address of the server computer identified by the decision logic.
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公开(公告)号：DE69433833T2
公开(公告)日：2006-04-06
申请号：DE69433833
申请日：1994-08-26
Applicant: IBM
Abstract: The present invention provides a data processing system, and method of operating such a system, for facilitating a connection of a program on a client computer to a server, the server consisting of a plurality of server computers with shared resources. The data processing system, the client computer, and the server computers all reside in a logical network. The data processing system has an input means for receiving a request from the client computer for a machine address of a server computer identified by a server computer name sent with the request, such a machine address enabling a connection to be made from the client computer to that server computer via the network. A storage device is provided by the system for storing a list identifying server computer names with machine addresses of the server computers. A conversion means in the system uses the list to convert the server computer name received by the input means into the machine address of the server computer, and then an output means sends the machine address from the conversion means to the client computer. The system is characterised by decision logic for studying the server computers at predetermined intervals having regard to a predetermined test criteria, in order to select one of the server computers; and writing means for updating the list by associating the machine address for the server computer selected by the decision logic with a particular server computer name contained as a generic server computer name in the list. Using this technique, when a client computer specifies the generic server computer name, it receives the machine address of the server computer identified by the decision logic.
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公开(公告)号：DE69433833D1
公开(公告)日：2004-07-15
申请号：DE69433833
申请日：1994-08-26
Applicant: IBM
Abstract: The present invention provides a data processing system, and method of operating such a system, for facilitating a connection of a program on a client computer to a server, the server consisting of a plurality of server computers with shared resources. The data processing system, the client computer, and the server computers all reside in a logical network. The data processing system has an input means for receiving a request from the client computer for a machine address of a server computer identified by a server computer name sent with the request, such a machine address enabling a connection to be made from the client computer to that server computer via the network. A storage device is provided by the system for storing a list identifying server computer names with machine addresses of the server computers. A conversion means in the system uses the list to convert the server computer name received by the input means into the machine address of the server computer, and then an output means sends the machine address from the conversion means to the client computer. The system is characterised by decision logic for studying the server computers at predetermined intervals having regard to a predetermined test criteria, in order to select one of the server computers; and writing means for updating the list by associating the machine address for the server computer selected by the decision logic with a particular server computer name contained as a generic server computer name in the list. Using this technique, when a client computer specifies the generic server computer name, it receives the machine address of the server computer identified by the decision logic.
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