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公开(公告)号:US20050253739A1
公开(公告)日:2005-11-17
申请号:US10966679
申请日:2004-10-14
申请人: Wei Hu , Alexander Hwang , Shen-Ban Meng , Alok Pareek , Dmitry Potapov , Francisco Sanchez
发明人: Wei Hu , Alexander Hwang , Shen-Ban Meng , Alok Pareek , Dmitry Potapov , Francisco Sanchez
CPC分类号: G06F17/30569
摘要: Stored data, such as tablespaces, are transported between different systems having different platforms by converting the format of the stored data into a common format either before or after transmitting the stored data from the source database system to the target database system. The common format may be a format that is universal in that the common format is not machine dependent. The stored data may be kept in the common format at the target database system and never converted to another format. Optionally, the stored data may be converted from the common format to a format associated with the target database system, thereby facilitating backward compatibility. A tool may be provided for performing the conversion. In an embodiment each of the target and source database systems have a copy of the tool.
摘要翻译: 通过将存储的数据从源数据库系统发送到目标数据库系统之前或之后将所存储的数据的格式转换成通用格式,将诸如表空间的存储的数据传送到具有不同平台的不同系统之间。 通用格式可以是通用的格式,因为通用格式不依赖于机器。 存储的数据可以在目标数据库系统中保持为通用格式,并且不会转换为另一种格式。 可选地,存储的数据可以从公共格式转换成与目标数据库系统相关联的格式,从而有助于向后兼容。 可以提供用于执行转换的工具。 在一个实施例中,目标和源数据库系统中的每一个具有工具的副本。
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公开(公告)号:US08296517B2
公开(公告)日:2012-10-23
申请号:US12859184
申请日:2010-08-18
申请人: Dmitry Potapov , Cetin Ozbutun , Juan Loaiza , Kirk Bradley
发明人: Dmitry Potapov , Cetin Ozbutun , Juan Loaiza , Kirk Bradley
IPC分类号: G06F12/00
CPC分类号: G06F3/0689 , G06F3/0604 , G06F3/064 , G06F12/0207 , G06F12/0246 , G06F12/0607 , G06F2212/7208
摘要: A method, device, and computer readable medium for striping rows of data across logical units of storage with an affinity for columns is provided. Alternately, a method, device, and computer readable medium for striping columns of data across logical units of storage with an affinity for rows is provided. When data of a logical slice is requested, a mapping may provide information for determining which logical unit is likely to store the logical slice. In one embodiment, data is retrieved from logical units that are predicted to store the logical slice. In another embodiment, data is retrieved from several logical units, and the data not mapped to the logical unit is removed from the retrieved data.
摘要翻译: 提供了一种方法,设备和计算机可读介质,用于跨逻辑存储单元条带化数据行,并且具有对列的亲和性。 或者,提供了一种方法,设备和计算机可读介质,用于跨存储的逻辑单元条带化数据列,具有对行的亲和性。 当请求逻辑片的数据时,映射可以提供用于确定哪个逻辑单元可能存储逻辑片的信息。 在一个实施例中,从预测存储逻辑片的逻辑单元检索数据。 在另一个实施例中,从多个逻辑单元检索数据,并且从所检索的数据中去除未映射到逻辑单元的数据。
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公开(公告)号:US08224813B2
公开(公告)日:2012-07-17
申请号:US11584255
申请日:2006-10-20
申请人: Sanjay Kaluskar , Varun Malhotra , Tirthankar Lahiri , Juan Loaiza , Sumanta Chatterjee , Dmitry Potapov , Margaret Susairaj , Hakan Jakobsson
发明人: Sanjay Kaluskar , Varun Malhotra , Tirthankar Lahiri , Juan Loaiza , Sumanta Chatterjee , Dmitry Potapov , Margaret Susairaj , Hakan Jakobsson
CPC分类号: G06F12/0866 , G06F17/30306
摘要: A method, system, and computer program product for cost based analysis for data access in a database management system. In one approach, the method, system, and computer program product identifies data to access. A first cost for direct I/O storage access and a second cost for cache access are then determined for accessing the data. A comparison between the first cost and the second cost is then performed. Finally, a first portion of identified data is accessed based at least in part upon the comparison.
摘要翻译: 一种用于数据库管理系统中数据访问的基于成本分析的方法,系统和计算机程序产品。 在一种方法中,方法,系统和计算机程序产品识别要访问的数据。 然后确定用于直接I / O存储访问的第一代价和用于高速缓存访问的第二成本用于访问数据。 然后执行第一个成本和第二个成本之间的比较。 最后,至少部分地基于比较来访问所识别的数据的第一部分。
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