摘要:
A method and apparatus for processing a query is provided. A query for a set of Matching XML documents is received. A client may transmit the query for a set of XML documents to the database server. The database server transmits a request for the set of XML documents to a persistent storage. The persistent storage uses an index, at least in part, to obtain the set of XML documents sought by the query. The index stores a first set of entries comprising information about the location of elements, a second set of entries comprising information about element attributes, and a third set of entries comprising information about element values. In responding to a particular query, additional XML documents that are not indexed by the index may also be checked to determine if they correspond to the set of search criteria.
摘要:
Systems, methods, and other embodiments associated with text indexing for updateable tokenized text are described. One example method includes receiving revised tokenized text intended to replace existing tokenized text in an indexed document. Token location information corresponding to the revised tokenized text is stored in an allocated free space portion of a text index posting.
摘要:
In one embodiment, a database server registers one or more functions included in a user-defined index that includes one or more auxiliary properties. The one or more functions are operable to generate index entries of the user-defined index for the one or more auxiliary properties. The one or more auxiliary properties are different than, and in addition to, a primary property of the user-defined index that provides for evaluating a query operator. The database server receives a first statement that defines the user-defined index, where the first statement includes one or more parameters that define the one or more auxiliary properties. The database server invokes the one or more functions in response to the first statement, where the one or more functions when invoked generate and store the index entries of the user-defined index according to the one or more parameters that define the one or more auxiliary properties.
摘要:
A bicycle includes a rear wheel rotatably mounted on a bicycle frame for rolling on a ground surface, a support unit pivotably mounted on the bicycle frame, and a locking unit disposed to releasably retain the support unit in a traveling position. The support unit includes a pivoted end, a shank member which extends from the pivoted end, and an elongated rail member connected to the shank member. The rail member has a supporting surface such that in a suspending position, the supporting surface is rested on the ground surface to suspend the rear wheel from the ground surface, and that when the support unit is turned to the traveling position, the rail member is turned to have the supporting surface face upwardly to serve as a rear rack of the bicycle.
摘要:
A heavy-pedaling bicycle includes a pedaling unit which is rotated to deliver a driving force to drive a rear wheel to roll on a ground surface, and a dragging mechanism which is disposed on at least one of stationary and rotary members to generate a dragging force which counteracts the driving force during the forward pedaling of the pedaling unit, and which is self-adjustably maintained to be smaller than the driving force so as to turn the forward pedaling movement into an evenly decelerated movement. The dragging mechanism may include one of a plurality of wind blades, magnetically attractive members, and spring-biased friction members to generate a respective one of a resisting force, a magnetically attractive force, and a frictional force to serve as the dragging force.
摘要:
An on-demand data management system. The system comprises a file management module and a demand analysis module. The file management module receives files. Each file has attributes. The file management module segments the files according the attributes. The demand analysis module receives a data demand and selects data from the segmented files according to the data demand.
摘要:
Techniques are provided for searching within a collection of XML documents. A relational table in an XML index stores an entry for each node of a set of nodes in the collection. Each entry of the relational table stores an order key and a path identifier along with the atomized value of the node. An index on the atomized value provides a mechanism to perform a node-aware full-text search. Instead of storing the atomized value in the table, a virtual column may be created to represent, for each node, the atomized value of the node. Alternately, each entry of the relational table stores an order key and a path identifier along with, for simple nodes, the atomized value, and for complex nodes, a null value. For a complex node with a descendant text node, a separate entry is stored for the descendant text node in the relational table.
摘要:
In one embodiment, a database server registers one or more functions included in a user-defined index that includes one or more auxiliary properties. The database server receives a query that specifies one or more parameters. A query optimizer generates a plurality of execution plans for evaluating the query. The query optimizer estimates a plurality of total costs respectively associated with the plurality of execution plans, where estimating a particular total cost associated with a particular execution plan comprises: invoking the one or more functions with one or more function arguments based on the one or more parameters; receiving one or more index costs that are associated with using the one or more auxiliary properties of the user-defined index to evaluate the query; and determining the particular total cost based on the one or more index costs. From the plurality of execution plans, the query optimizer selects an optimal execution plan that is associated with an optimal total cost of the plurality of total costs.
摘要:
A SRAM device includes at least one memory cell having a source line for receiving an internal supply power, and a voltage management circuit coupled to the source line for generating the internal supply power that varies in at least two different voltage levels, depending on various operation modes of the memory cell.
摘要:
A static random access memory (SRAM) cell includes a first load device, a first pull-down transistor, and a switch-box coupled between the first load device and the first pull-down transistor. The switch-box is configured to receive a switch control signal to turn off a first connection between the first load device and the first pull-down transistor during read operations of the SRAM cell and to turn on the first connection during write operations.