Techniques for partial rewrite of XPath queries in a relational database
    11.
    发明授权
    Techniques for partial rewrite of XPath queries in a relational database 有权
    在关系数据库中部分重写XPath查询的技术

    公开(公告)号:US07386568B2

    公开(公告)日:2008-06-10

    申请号:US10984471

    申请日:2004-11-08

    IPC分类号: G06F17/30

    摘要: Techniques are described for executing queries that have XPath sections that specify unmappable paths. The techniques involve splitting the unmappable paths into (1) a mappable path fragment, and (2) an unmappable path fragment. After an unmappable path has been split into a mappable path fragment and an unmappable path fragment, the XPath section is replaced with a replacement XPath section. The replacement XPath section specifies two operations: a “mappable operation” that is based on the mappable path fragment, and an “unmappable operation” that is based on the unmappable path fragment. The portion of the replacement XPath section that specifies the mappable operation is rewritten to access underlying relational structures. Consequently, when the rewritten query is executed, a smaller amount of XML data needs to be materialized to evaluate the unmappable path fragment than would otherwise have been required to evaluate the original unmappable path.

    摘要翻译: 描述了执行具有指定不可映射路径的XPath节的查询的技术。 这些技术涉及将不可映射的路径分解为(1)可映射路径片段,以及(2)不可映射的路径片段。 将不可映射路径分解为可映射路径片段和不可映射路径片段后,XPath节将替换为替换的XPath节。 替换XPath部分指定两个操作:基于可映射路径片段的“可映射操作”和基于不可映射路径片段的“不可映映操作”。 替换XPath部分指定可映射操作的部分被重写为访问基础关系结构。 因此,当执行重写的查询时,需要实现较少量的XML数据来评估不可映射的路径片段,而不是否则需要评估原始的不可映射路径。

    Techniques of optimizing queries using NULL expression analysis
    12.
    发明申请
    Techniques of optimizing queries using NULL expression analysis 有权
    使用NULL表达式分析优化查询的技术

    公开(公告)号:US20080065674A1

    公开(公告)日:2008-03-13

    申请号:US11517969

    申请日:2006-09-08

    IPC分类号: G06F17/00

    CPC分类号: G06F17/30454

    摘要: A method for optimizing queries is described. A query, which includes a first expression for determining whether each of a set of values evaluates to NULL or NOT NULL, is received. At compile-time, a first representation of the query is generated, where the first representation indicates that the query is to be performed based on the first expression. Based on the first expression, a second expression is determined. The second expression is such that the first expression would evaluate to any NOT NULL value if and only if the second expression would evaluate to any NOT NULL value. The second expression, when evaluated, is much more computationally efficient compared with the evaluation of the first expression. Based on the first representation, a second representation of the query is generated, where the second representation indicates that the query is to be performed based on the second expression. Thereafter, the query is executed based on the second representation.

    摘要翻译: 描述用于优化查询的方法。 一个查询,其中包含一个第一表达式,用于确定一组值中的每一个是否计算为NULL或NOT NULL。 在编译时,生成查询的第一个表示,其中第一个表示指示要根据第一个表达式执行查询。 基于第一个表达式,确定第二个表达式。 第二个表达式使得当且仅当第二个表达式计算为任何NOT NULL值时,第一个表达式将求值为任何NOT NULL值。 第二个表达式与评估第一个表达式相比,计算效率要高得多。 基于第一表示,生成查询的第二表示,其中第二表示指示将基于第二表达式执行查询。 此后,基于第二表示执行查询。

    Processing queries against one or more markup language sources
    13.
    发明授权
    Processing queries against one or more markup language sources 有权
    处理针对一个或多个标记语言源的查询

    公开(公告)号:US07668806B2

    公开(公告)日:2010-02-23

    申请号:US10948536

    申请日:2004-09-22

    IPC分类号: G06F17/30

    摘要: Techniques are provided for processing a query, including receiving the query, where the query specifies certain operations to be performed, including (a) a first set of one or more operations that are to be performed on a markup language data source and (b) a second set of one or more operations that are to be performed on a second data source. Then it is determined that a first server that manages the markup language data source is capable of performing the first set of operations. A request is sent to the first server to perform the first set of operations. A response is received, where the response contains results of performing the first set of operations on the markup language data source. Finally, results are generated for the query based at least in part on the results of performing the first set of operations.

    摘要翻译: 提供了用于处理查询的技术,包括接收查询,其中查询指定要执行的某些操作,包括(a)要在标记语言数据源上执行的一个或多个操作的第一组,以及(b) 要在第二数据源上执行的一个或多个操作的第二组。 然后,确定管理标记语言数据源的第一服务器能够执行第一组操作。 发送请求到第一台服务器执行第一组操作。 收到响应,其中响应包含对标记语言数据源执行第一组操作的结果。 最后,至少部分地基于执行第一组操作的结果为查询生成结果。

    Techniques for efficient integration of text searching with queries over XML data
    15.
    发明授权
    Techniques for efficient integration of text searching with queries over XML data 有权
    通过XML数据高效集成文本搜索与查询的技术

    公开(公告)号:US07305414B2

    公开(公告)日:2007-12-04

    申请号:US11099918

    申请日:2005-04-05

    IPC分类号: G06F17/30

    摘要: A method and apparatus for rewriting a database command containing an embedded XML expression such that the rewritten database command recites a text function, in lieu of the embedded XML expression, is provided. Advantageously, a DBMS may take advantage of the efficiencies in storing XML data within the database, while avoiding the generation of unnecessary XML elements in processing the query when the XML elements contribute nothing to the outcome of the query. Cost-base or rule-based analysis may be performed to determine how to rewrite a received database command. The database server may functionally evaluate the text function or may use an index defined on a column of the database. The text function may function as a primary filter or may reference a column upon which an index is defined, wherein the index operates at the same or higher level than a column being referenced in the embedded XML expression.

    摘要翻译: 提供一种用于重写包含嵌入式XML表达式的数据库命令的方法和装置,使得重写的数据库命令背景文本功能代替嵌入的XML表达。 有利地,DBMS可以利用在数据库中存储XML数据的效率,同时避免在XML元素对查询的结果没有贡献时在处理查询时生成不必要的XML元素。 可以执行基于成本或基于规则的分析来确定如何重写接收到的数据库命令。 数据库服务器可以在功能上评估文本功能,或者可以使用在数据库的列上定义的索引。 文本函数可以用作主过滤器,或者可以引用定义索引的列,其中索引在与嵌入式XML表达式中引用的列相同或更高的级别上操作。

    Techniques of efficient XML query using combination of XML table index and path/value index
    16.
    发明授权
    Techniques of efficient XML query using combination of XML table index and path/value index 有权
    使用XML表索引和路径/值索引的组合的高效XML查询技术

    公开(公告)号:US09436779B2

    公开(公告)日:2016-09-06

    申请号:US11601146

    申请日:2006-11-17

    IPC分类号: G06F17/30

    摘要: A mechanism is provided for accessing XML data in a database system using a combination of a XML Table Index table and a XML Path Index table. By using a combination of a XML Table Index and a XML Path Index, both selection access and navigational access involved in a query can be optimized. For example, the XML Table Index gives the database system an ability to readily evaluate the predicate expression, thereby improving the selection access. Moreover, in some embodiments, the selection access can be further improved by using secondary indexes on columns contained in the XML Table Index table. In a complementary manner, the XML Path Index table gives the database system an ability to navigate to a specific location given a path expression, thereby improving the navigational access. Thus, by combining both tables, both selection and navigational accesses are improved.

    摘要翻译: 提供了一种机制,用于使用XML表索引表和XML路径索引表的组合来访问数据库系统中的XML数据。 通过使用XML表索引和XML路径索引的组合,可以优化查询中涉及的选择访问和导航访问。 例如,XML表索引使数据库系统能够容易地评估谓词表达式,从而改善选择访问。 此外,在一些实施例中,可以通过在XML表索引表中包含的列上使用辅助索引来进一步改进选择访问。 以互补的方式,XML路径索引表给数据库系统一个导航到指定路径表达式的特定位置的能力,从而改善导航访问。 因此,通过组合两个表,提高了选择和导航访问。

    Techniques of efficient query over text, image, audio, video and other domain specific data in XML using XML table index with integration of text index and other domain specific indexes
    17.
    发明申请
    Techniques of efficient query over text, image, audio, video and other domain specific data in XML using XML table index with integration of text index and other domain specific indexes 有权
    使用XML表索引对文本,图像,音频,视频和XML中的其他域特定数据进行高效查询的技术,整合文本索引和其他域特定索引

    公开(公告)号:US20080120322A1

    公开(公告)日:2008-05-22

    申请号:US11601147

    申请日:2006-11-17

    IPC分类号: G06F17/30

    CPC分类号: G06F17/30911 G06F17/30929

    摘要: Commonly searched nodes of complex data types contained in a collection of XML documents can be projected to, and their values can be stored in, corresponding columns in XML Table Index tables in a database system. In one embodiment, those columns stores logical pointers, rather than raw values, of the complex data types. Domain indexes are further provided to index at least one of the columns of complex data types in XML Table Indexes. The inclusion of complex data types and domain indexes provide a more efficient mechanism for searching domain specific data, such as audio, video, text stored in the collection of XML documents. Query optimizer logic of the database system can prepare one or more query execution plans for a submitted query including a plan that leverages XML Table Indexes and domain indexes and select a query execution plan based on cost information.

    摘要翻译: 可以将包含在XML文档集合中的复杂数据类型的常见搜索节点投影到其数据库系统中的XML表索引表中的相应列中,并将其值存储在相应的列中。 在一个实施例中,这些列存储复杂数据类型的逻辑指针而不是原始值。 进一步提供域索引以索引XML表索引中复杂数据类型的列中的至少一列。 包含复杂数据类型和域索引提供了一种更有效的机制,用于搜索存储在XML文档集合中的域特定数据,例如音频,视频,文本。 数据库系统的查询优化器逻辑可以为提交的查询准备一个或多个查询执行计划,包括利用XML表索引和域索引的计划,并根据成本信息选择查询执行计划。

    Techniques of efficient XML meta-data query using XML table index
    18.
    发明授权
    Techniques of efficient XML meta-data query using XML table index 有权
    使用XML表索引的高效XML元数据查询技术

    公开(公告)号:US07644066B2

    公开(公告)日:2010-01-05

    申请号:US11394878

    申请日:2006-03-31

    IPC分类号: G06F17/30

    摘要: XML table indexes provide a more efficient mechanism for searching data stored in aggregate form. XML table indexes are a set of tables created to project out in column form commonly sought metadata from stored XML documents. By projecting the data includes into column form, queries on the XML documents can be efficiently processed as they can leverage the enhanced functionality provided by the database tables. The XML table indexes may use aliases, partitioning, constraints and other functions to further improve query flexibility and performance.

    摘要翻译: XML表索引为搜索以聚合形式存储的数据提供了更有效的机制。 XML表索引是一组创建的表格,通常以存储的XML文档寻求元数据的形式进行投射。 通过将数据包括到列形式中,可以有效地处理关于XML文档的查询,因为它们可以利用数据库表提供的增强功能。 XML表索引可以使用别名,分区,约束和其他功能来进一步提高查询的灵活性和性能。

    Optimization of queries on a repository based on constraints on how the data is stored in the repository
    19.
    发明授权
    Optimization of queries on a repository based on constraints on how the data is stored in the repository 有权
    基于对数据如何存储在存储库中的约束来优化存储库中的查询

    公开(公告)号:US08793267B2

    公开(公告)日:2014-07-29

    申请号:US13454977

    申请日:2012-04-24

    IPC分类号: G06F7/00 G06F17/30

    CPC分类号: G06F17/30471 G06F17/301

    摘要: Constraints that restrict how corresponding identifiable groups of files are stored in a database, are enforced on corresponding file data. In response to a query on any data from an identifiable group of files, the effect of the constraint on how the corresponding data is stored is determined. The original query is rewritten, based on the effect of the constraint, so that the rewritten query is directed to a particular subset of the data stored in the database. Consequently, the search space is restricted to an identifiable subset of the database and execution of the rewritten query is more efficient than execution of the original query.

    摘要翻译: 在相应的文件数据上强制限制如何将对应的可识别文件组存储在数据库中。 响应于来自可识别文件组的任何数据的查询,确定约束对如何存储相应数据的影响。 基于约束的影响,原始查询被重写,使得重写的查询被定向到存储在数据库中的数据的特定子集。 因此,搜索空间限于数据库的可识别子集,并且重写的查询的执行比执行原始查询更有效。

    Techniques of efficient query over text, image, audio, video and other domain specific data in XML using XML table index with integration of text index and other domain specific indexes
    20.
    发明授权
    Techniques of efficient query over text, image, audio, video and other domain specific data in XML using XML table index with integration of text index and other domain specific indexes 有权
    使用XML表索引对文本,图像,音频,视频和XML中的其他域特定数据进行高效查询的技术,整合文本索引和其他域特定索引

    公开(公告)号:US08478760B2

    公开(公告)日:2013-07-02

    申请号:US11601147

    申请日:2006-11-17

    IPC分类号: G06F17/30

    CPC分类号: G06F17/30911 G06F17/30929

    摘要: Commonly searched nodes of complex data types contained in a collection of XML documents can be projected to, and their values can be stored in, corresponding columns in XML Table Index tables in a database system. In one embodiment, those columns stores logical pointers, rather than raw values, of the complex data types. Domain indexes are further provided to index at least one of the columns of complex data types in XML Table Indexes. The inclusion of complex data types and domain indexes provide a more efficient mechanism for searching domain specific data, such as audio, video, text stored in the collection of XML documents. Query optimizer logic of the database system can prepare one or more query execution plans for a submitted query including a plan that leverages XML Table Indexes and domain indexes and select a query execution plan based on cost information.

    摘要翻译: 可以将包含在XML文档集合中的复杂数据类型的常见搜索节点投影到其数据库系统中的XML表索引表中的相应列中,并将其值存储在相应的列中。 在一个实施例中,这些列存储复杂数据类型的逻辑指针而不是原始值。 进一步提供域索引以索引XML表索引中复杂数据类型的列中的至少一列。 包含复杂数据类型和域索引提供了一种更有效的机制,用于搜索存储在XML文档集合中的域特定数据,例如音频,视频,文本。 数据库系统的查询优化器逻辑可以为提交的查询准备一个或多个查询执行计划,包括利用XML表索引和域索引的计划,并根据成本信息选择查询执行计划。