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    Database management system, method and program for supporting the mutation of a composite object without read/write and write/write conflicts
    2.
    发明授权
    Database management system, method and program for supporting the mutation of a composite object without read/write and write/write conflicts 失效
    数据库管理系统，支持复制对象突变的方法和程序，无需读/写和写/写冲突

    公开(公告)号：US5857182A

    公开(公告)日：1999-01-05

    申请号：US786605

    申请日：1997-01-21

    申请人： Linda Gail DeMichiel ,  Gene Y. C. Fuh ,  Michelle Mei-Chiou Jou ,  Bruce Gilbert Lindsay ,  Nelson Mendonca Mattos ,  Serge Philippe Rielau ,  Brian Thinh-Vinh Tran

    发明人： Linda Gail DeMichiel ,  Gene Y. C. Fuh ,  Michelle Mei-Chiou Jou ,  Bruce Gilbert Lindsay ,  Nelson Mendonca Mattos ,  Serge Philippe Rielau ,  Brian Thinh-Vinh Tran

    IPC分类号： G06F17/30

    CPC分类号： G06F17/30607 ,  Y10S707/99931 ,  Y10S707/99932 ,  Y10S707/99933 ,  Y10S707/99934 ,  Y10S707/99935 ,  Y10S707/99936 ,  Y10S707/99937 ,  Y10S707/99938

    摘要： The system, method, and program of this invention avoids potential write/write conflicts and read/write conflicts when a subcomponent of a composite object (e.g., an ADT) is mutated. The embodiments of this invention define a copy semantic for the mutation function. In one embodiment, a copy function is inserted prior to any mutation function. In a another embodiment, a global compile-time analysis is performed to determine if a write/write or read/write conflict exists; and to eliminate redundant copy constructors if a conflict does exist. In a preferred embodiment, only a local analysis is performed during the parsing phase, thereby avoiding a global compile-time analysis. A mutation safe flag is associated with each parse tree node. A read target leaf parse tree node is set to false while non-leaf parse tree nodes (functions) derive their value from an incoming node, except that constructors and copy constructor functions are always true. Whether or not a copy is made of the composite object (i.e., whether or not a copy constructor is inserted) prior to a mutation is determined according to the setting of the mutation safe flags and according to the following. If a mutation safe flag for a mutation function is false, a copy constructor is inserted for the mutated composite object and the mutation safe flag is set to true. In addition, for update and trigger statements, the mutation safe flag for a mutated target is defaulted to true. Furthermore, related update entries are grouped together and a copy is generated for the common target. The generated copy is used as the common target for all of the mutations caused by the update entries grouped together in order to accumulate all of the desired mutations in a same copy of the composite object.

    摘要翻译： 本发明的系统，方法和程序在复合对象（例如，ADT）的子组件被突变时避免潜在的写入/写入冲突和读/写冲突。 本发明的实施例定义了突变功能的复制语义。 在一个实施例中，在任何突变功能之前插入复制功能。 在另一实施例中，执行全局编译时分析以确定是否存在写/写或读/写冲突; 并且如果存在冲突，则消除冗余的拷贝构造函数。 在优选实施例中，在解析阶段仅执行局部分析，从而避免了全局编译时分析。 突变安全标志与每个解析树节点相关联。 读取目标叶解析树节点设置为false，而非叶解析树节点（函数）从传入节点导出其值，除了构造函数和复制构造函数始终为真。 根据突变安全标志的设置，根据以下来确定复制对象（即，是否插入复制构造函数）之前的副本是否被复制。 如果突变功能的突变安全标志为假，则为突变复合对象插入复制构造函数，并将突变安全标志设置为true。 另外，对于更新和触发语句，突变目标的突变安全标志默认为true。 此外，将相关的更新条目分组在一起，并为共同目标生成副本。 生成的拷贝被用作由更新条目组合在一起引起的所有突变的共同目标，以便累积复合对象的相同副本中的所有期望的突变。

    Relational database extender that supports user-defined index types and user-defined search
    5.
    发明授权
    Relational database extender that supports user-defined index types and user-defined search 有权
    关系数据库扩展器，支持用户定义的索引类型和用户定义的搜索

    公开(公告)号：US06338056B1

    公开(公告)日：2002-01-08

    申请号：US09296821

    申请日：1999-04-22

    申请人： Stefan Dessloch ,  Gene Y. C. Fuh ,  Michelle Mei-Chiou Jou ,  Nelson Mendonca Mattos ,  Raiko Nitzsche

    发明人： Stefan Dessloch ,  Gene Y. C. Fuh ,  Michelle Mei-Chiou Jou ,  Nelson Mendonca Mattos ,  Raiko Nitzsche

    IPC分类号： G06F1730

    CPC分类号： G06F17/30321 ,  G06F17/30386 ,  G06F17/30911 ,  Y10S707/99932 ,  Y10S707/99933 ,  Y10S707/99934 ,  Y10S707/99943 ,  Y10S707/99945

    摘要： A new approach to indexing semi-structured, non-traditional data uses an external search engine accessible to a database engine through a standardized interface. An external index managed by an external search engine maps object identifiers associated with the non-traditional data to row identifiers for a table stored in the relational database. In response to a query, one or more of the object identifiers are retrieved from the external index by the external search engine. The object identifiers returned by the external search engine are then used by the database engine to retrieve one or more row identifiers from an index in the relational database. The row identifiers are then used to retrieve one or more rows from the table in the relational database.

    摘要翻译： 索引半结构化非传统数据的新方法使用通过标准化接口可访问数据库引擎的外部搜索引擎。 由外部搜索引擎管理的外部索引将与非传统数据相关联的对象标识符映射到关系数据库中存储的表的行标识符。 响应于查询，外部搜索引擎从外部索引检索一个或多个对象标识符。 然后由外部搜索引擎返回的对象标识符被数据库引擎用于从关系数据库中的索引检索一个或多个行标识符。 然后，行标识符用于从关系数据库中的表中检索一个或多个行。