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Patent Agency Ranking
公开(公告)号：JPH11120066A
公开(公告)日：1999-04-30
申请号：JP21284698
申请日：1998-07-28
Applicant: IBM
Abstract: PROBLEM TO BE SOLVED: To obtain consistency on another system including a transaction manager by deciding how alterations of basic data affect the values of one or more hybrid objects. SOLUTION: A client 90 communicates a request to a server 100 through a network 95. The server 100 maintains and uses a cache 2 to improve performance and decreases the CPU time complying with the request of the client 90. At least part of the basic data which can or can not be cached is discriminated. At least part of the basic data is mapped to one or more hybrid objects having single or multiple data dependency on at least part of the basic data. Thus, it can be decided how modifications of the basic data affect the values of one or more hybrid objects.
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公开(公告)号：GB2328535B
公开(公告)日：2002-08-14
申请号：GB9815429
申请日：1998-07-17
Applicant: IBM
Inventor： CHALLENGER JAMES ROBERT HAROLD , DANTZIG PAUL MICHAEL , IYENGAR ARUN KWANGIL , SPIVAK GERALD A
Abstract: A determination can be made of how changes to underlying data affect the value of objects. Examples of applications include: caching dynamic Web pages; client-server applications whereby a server sending objects (which are changing all the time) to multiple clients can track which versions are sent to which clients and how obsolete the versions are; and any situation where it is necessary to maintain and uniquely identify several versions of objects, update obsolete objects, quantitatively assess how different two versions of the same object are, and/or maintain consistency among a set of objects. A directed graph, called an object dependence graph, may be used to represent the data dependencies between objects. Another aspect is constructing and maintaining objects to associate changes in remote data with cached objects. If data in a remote data source changes, database change notifications are used to "trigger" a dynamic rebuild of associated objects. Thus, obsolete objects can be dynamically replaced with fresh objects. The objects can be complex objects, such as dynamic Web pages or compound-complex objects, and the data can be underlying data in a database. The update can include either: storing a new version of the object in the cache; or deleting an object from the cache. Caches on multiple servers can also be synchronized with the data in a single common database. Updated information, whether new pages or delete orders, can be broadcast to a set of server nodes, permitting many systems to simultaneously benefit from the advantages of prefetching and providing a high degree of scaleability.
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公开(公告)号：GB2328535A
公开(公告)日：1999-02-24
申请号：GB9815429
申请日：1998-07-17
Applicant: IBM
Inventor： CHALLENGER JAMES ROBERT HAROLD , DANTZIG PAUL MICHAEL , IYENGAR ARUN KWANGIL , SPIVAK GERALD A
Abstract: A determination can be made of how changes to underlying data affect the value of objects. Examples of applications include: caching dynamic Web pages; client-server applications whereby a server sending objects (which are changing all the time) to multiple clients can track which versions are sent to which clients and how obsolete the versions are; and any situation where it is necessary to maintain and uniquely identify several versions of objects, update obsolete objects, quantitatively assess how different two versions of the same object are, and/or maintain consistency among a set of objects. A directed graph, called an object dependence graph, may be used to represent the data dependencies between objects. Another aspect is constructing and maintaining objects to associate changes in remote data with cached objects. If data in a remote data source changes, database change notifications are used to "trigger" a dynamic rebuild of associated objects. Thus, obsolete objects can be dynamically replaced with fresh objects. The objects can be complex objects, such as dynamic Web pages or compound-complex objects, and the data can be underlying data in a database. The update can include either: storing a new version of the object in the cache; or deleting an object from the cache. Caches on multiple servers can also be synchronized with the data in a single common database. Updated information, whether new pages or delete orders, can be broadcast to a set of server nodes, permitting many systems to simultaneously benefit from the advantages of prefetching and providing a high degree of scalability.
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公开(公告)号：GB2345993B
公开(公告)日：2003-09-17
申请号：GB9919526
申请日：1999-08-19
Applicant: IBM
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公开(公告)号：GB2345993A
公开(公告)日：2000-07-26
申请号：GB9919526
申请日：1999-08-19
Applicant: IBM
Inventor： CHALLENGER JAMES , DANTZIG PAUL MICHAEL , DIAS DANIEL MANUEL , IYENGAR ARUN KWANGIL , LEVY-ABEGNOLI ERIC
Abstract: Coordinated, hierarchical caching of objects in a client/server system. In the described embodiment, an encapsulated cluster 70 comprises one or more level 1 nodes 20, e.g. Web server accelerators or routers, each including at least one level 1 cache 30, and one or more level 2 nodes 40, e.g. Web servers, within which the objects are permanently stored or generated on request. Each level 2 node is coupled to at least one level 1 node and includes one or more level 2 caches 50. More levels can be included. Object caching is based on various described criteria: for instance, the level 2 cache(s) can be used to cache dynamic pages which are expensive to create, while the level 1 cache(s) can be used to cache static pages, and hot dynamic pages. Different cache replacement policies for the level 1 cache(s) are also described (Fig. 4), in order to optimize performance whether the performance bottleneck is router processing power, server processing power, or the network between the server(s) and the router.
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