Intelligent page store for concurrent and consistent access to a

Details Intelligent page store for concurrent and consistent access to a Intelligent page store for concurrent and consistent access to a

1991-02-25

1994-05-31

Lee, Thomas C.

Boots, shoes, and leggings

3642821, 3642543, 3642602, 364DIG1, 3649746, 395425, G06F 1540

Patent

active

053177312

ABSTRACT:
An apparatus, embodied in an Intelligent Page Store, for providing concurrent and consistent access to a functionally separate transaction entity and a query entity to a shared database, while maintaining a single physical copy of most of the data. The Intelligent Page Store contains shared disk storage, and an intelligent versioning mechanism allows simultaneous access by the transaction entity and the query entity to the shared data. The transaction entity is presented the current data and the query entity is presented a recent and consistent version of the data. A single copy of all but recently updated pages is maintained by the Intelligent Page Store. The query and transaction entities operate independently of each other and are separately optimized.

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Korth and Silberschatz, Database System Concepts, 1991, McGraw Hill Chapter 12.

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