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    • 3. 发明申请
    • System and method for performing just-in-time priming of a database cache
    • 用于执行数据库高速缓存的即时启动的系统和方法
    • US20060230013A1
    • 2006-10-12
    • US11303714
    • 2005-12-16
    • Namik HrleJames Teng
    • Namik HrleJames Teng
    • G06F17/30
    • G06F17/30442G06F17/3048G06F17/30492
    • A system for retrieving stored data and/or index pages, receives a database request, generates an access plan for the database request for accessing data rows and/or index entries according to the statement, and generates a priming process by selecting a set of data and/or index pages. The set of data and/or index pages is a super-set or the exact set of the pages needed for accessing data rows and/or index entries according to the access plan. The present system retrieves the data and/or index pages of the set before executing the database request according to the access plan. The execution of the database request is performed by scanning the index and data pages preloaded into the cache. This reduces the number of necessary disk reads during execution.
    • 一种用于检索存储的数据和/或索引页面的系统,接收数据库请求,根据该语句生成访问数据行和/或索引条目的数据库请求的访问计划,并通过选择一组数据来生成启动过程 和/或索引页。 一组数据和/或索引页是根据访问计划访问数据行和/或索引条目所需的超集或精确的页面集合。 根据访问计划,本系统在执行数据库请求之前检索该集合的数据和/或索引页。 通过扫描预先加载到缓存中的索引和数据页执行数据库请求。 这样可以减少执行期间所需的磁盘读取次数。
    • 5. 发明申请
    • METHOD FOR SEARCHING A DATA PAGE FOR INSERTING A DATA RECORD
    • 搜索用于插入数据记录的数据页的方法
    • US20070168640A1
    • 2007-07-19
    • US11620187
    • 2007-01-05
    • Namik HrleJohannes SchuetznerJames Teng
    • Namik HrleJohannes SchuetznerJames Teng
    • G06F12/00
    • G06F17/30598G06F17/30492
    • A method of searching a data page in a table space of a database for inserting a data record to a first table, wherein the table space comprises space map pages and sets of data pages, wherein each space map page comprises information about the available storage space of one set of data pages, wherein each space map page and the corresponding set of data pages is further assigned to a table range for each table to which at least one data page in the set of data pages belongs to, wherein the database further comprises a clustering index for the first table in the database management system, wherein the database management system comprises a space usage information database, and wherein the space usage information database holds space usage information for each table range.
    • 一种在数据库的表空间中搜索用于将数据记录插入到第一表的数据页的方法,其中所述表空间包括空间图页和数据页组,其中每个空间图页包括关于可用存储空间的信息 一组数据页面,其中每个空间地图页面和对应的数据页面集合进一步分配给数据页组中的至少一个数据页面所属的每个表的表范围,其中数据库还包括 数据库管理系统中的第一表的聚类索引,其中所述数据库管理系统包括空间使用信息数据库,并且其中所述空间使用信息数据库保存每个表范围的空间使用信息。
    • 7. 发明授权
    • Method for searching a data page for inserting a data record
    • 用于搜索数据页以插入数据记录的方法
    • US07693875B2
    • 2010-04-06
    • US11620187
    • 2007-01-05
    • Namik HrleJohannes SchuetznerJames Teng
    • Namik HrleJohannes SchuetznerJames Teng
    • G06F12/00G06F17/30G06F9/26G06F9/34
    • G06F17/30598G06F17/30492
    • A method of searching a data page in a table space of a database for inserting a data record to a first table, wherein the table space comprises space map pages and sets of data pages, wherein each space map page comprises information about the available storage space of one set of data pages, wherein each space map page and the corresponding set of data pages is further assigned to a table range for each table to which at least one data page in the set of data pages belongs to, wherein the database further comprises a clustering index for the first table in the database management system, wherein the database management system comprises a space usage information database, and wherein the space usage information database holds space usage information for each table range.
    • 一种在数据库的表空间中搜索用于将数据记录插入到第一表的数据页的方法,其中所述表空间包括空间图页和数据页组,其中每个空间图页包括关于可用存储空间的信息 一组数据页面,其中每个空间地图页面和对应的数据页面集合进一步分配给数据页组中的至少一个数据页面所属的每个表的表范围,其中数据库还包括 数据库管理系统中的第一表的聚类索引,其中所述数据库管理系统包括空间使用信息数据库,并且其中所述空间使用信息数据库保存每个表范围的空间使用信息。
    • 8. 发明申请
    • System and method for incremental indexing
    • 增量索引的系统和方法
    • US20060155752A1
    • 2006-07-13
    • US11271677
    • 2005-11-10
    • Namik HrleJames Teng
    • Namik HrleJames Teng
    • G06F17/30
    • G06F17/30336
    • The present system indexes a plurality of entries in a database that contains a database table having a base index. As a recent row is inserted in the database table, an index increment is generated based on the inserted row. Preferably, the index increment is smaller in size than the base index because it is recently generated. The smaller size of the index increment facilitates the management of the index increment. An index entry associated with the inserted row is added to the index increment, and the index increment is merged with the base index.
    • 本系统对包含具有基本索引的数据库表的数据库中的多个条目进行索引。 由于最近一行插入到数据库表中,所以根据插入的行生成索引增量。 优选地,索引增量的大小比基本索引更小,因为它最近被生成。 索引增量的较小尺寸有助于指数增量的管理。 与插入行相关联的索引条目被添加到索引增量中,索引增量与基本索引合并。
    • 9. 发明申请
    • OVER-CURRENT SENSING DURING NARROW GATE DRIVE OPERATION OF CLASS D OUTPUT STAGES
    • N型门驱动期间的超电流感测D类输出级的操作
    • US20090174485A1
    • 2009-07-09
    • US11970289
    • 2008-01-07
    • James TengQiong M. LiCetin Kaya
    • James TengQiong M. LiCetin Kaya
    • H03F1/52H03F3/217
    • H03F3/2173H03F1/523H03F2200/03H03F2200/351
    • Two transistors of a class D output stage are driven by complementary, variable duty cycle signals PWM+ and PWM−. When the pulse width of the PWM+ signal becomes too narrow for reliable operation of prior art over-current protection circuits sensing the drain to source voltage of FET1 driven by PWM+, a Narrow Pulse Detector generates a signal indicative of this narrow pulse condition. A Negative Current Sense circuit measures the drain to source voltage across FET2 during the much longer conduction time of FET2 driven by PWM−. Because of the energy stored in the series inductor coupled to the output of the class D stage, a negative current flows through this FET2 during its conduction time. The resulting drain to source voltage of FET2 is measured and compared to a threshold. If the voltage indicative of current is over the threshold, and the Narrow Pulse Detector output indicates a narrow pulse condition, then an inhibit signal is generated which reduces current. A second Negative Current Sense circuit is utilized to similarly detect over-current conditions when the pulse width of PWM− becomes too narrow for reliable operation of prior art over-current protection circuits, thus protecting both FETs in the class D output stage from excessive current.
    • D类输出级的两个晶体管由互补的可变占空比信号PWM +和PWM-驱动。 当PWM +信号的脉冲宽度变得太窄,以便于感测由PWM +驱动的FET1的漏极 - 源极电压的现有技术的过电流保护电路的可靠操作时,窄脉冲检测器产生指示该窄脉冲条件的信号。 在由PWM驱动的FET2的更长的导通时间内,负电流检测电路测量FET2两端的漏源电压。 由于存储在串联电感器中的能量耦合到D级的输出端,所以在其导通时间期间,负电流流过该FET2。 测量FET2的所得到的源极到源极电压并将其与阈值进行比较。 如果指示电流的电压超过阈值,并且窄脉冲检测器输出指示窄脉冲条件,则产生减少电流的禁止信号。 使用第二负电流检测电路来类似地检测当PWM的脉冲宽度变得太窄以致于现有技术的过电流保护电路的可靠操作时的过电流状况,从而保护D类输出级中的两个FET免受过大的电流 。