Transaction consistent copy-on-write database

A database and transaction technology, applied in the field of database systems

Inactive Publication Date: 2005-02-09
MICROSOFT TECH LICENSING LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, this versioning no longer persists across database server restarts

Method used

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  • Transaction consistent copy-on-write database
  • Transaction consistent copy-on-write database
  • Transaction consistent copy-on-write database

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Embodiment Construction

[0019] Exemplary Computing Environment

[0020] Figure 1 shows an exemplary computing environment in which certain aspects of the invention may be implemented. Computing system environment 100 is only one example of a suitable computing environment and is not intended to limit the scope of use or functionality of the invention. Neither should the computing system 100 be interpreted as having any dependency or requirement relating to any one or combination of components described in the exemplary operating environment 100 .

[0021] The invention is operational with numerous other general purpose or special purpose computing system environments or configurations. There are many well-known computing systems, environments, and / or configurations suitable for use with the present invention, including, for example, but not limited to: personal computers, server computers, palm or laptop devices, multiprocessor systems, microprocessor-based systems , set-top boxes, programmable c...

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Abstract

A database view of a database is created which provides a transaction-consistent view of an existing database at a previous time. Each database view contains all the information needed to, along with the primary database, determine the contents of the primary database at a previous time. The database view consists of a side file corresponding to each data file in the primary database. The side files contain a copy of all data from the corresponding data file which has been changed since the database view was created. Sparse files may be used for the side files in order to conserve space. Page table data is kept in order to allow a quick determination as to whether the page from the primary database has been modified and the old version stored in the database view side file.

Description

technical field [0001] The present invention generally relates to the field of database systems. In particular, the invention relates to creating transactionally compliant copies of databases. Background technique [0002] Today, the use of databases and database products is widespread. A database stores information in the form of objects such as logs, tables, and indexes. In addition to the latest version of information stored in the database, previous versions of information may also be available to users. [0003] One way to provide information about previous versions of data is to make a full copy of the database at some point in time that might be of interest to the user. When making a copy, all database-related files will be stored. But this technique consumes a considerable amount of storage space, because for a database stored with a certain amount of storage space, each copy of it will also require the same amount of storage space. This approach can also be tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/00G06F11/14G06F12/16G06F17/30G06F17/40
CPCG06F17/30551G06F11/1451Y10S707/99952G06F2201/80Y10S707/99953G06F11/1471G06F11/1402G06F17/30595G06F16/284G06F16/24557G06F16/2477G06F17/40G06F12/16
Inventor M·J·泽维灵L·S·布鲁克S·H·艾加瓦尔言康荣
Owner MICROSOFT TECH LICENSING LLC
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