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Method and apparatus for virtual memory mapping and transaction management in an object-oriented database system

  • US 20050120080A1
  • Filed: 09/16/2004
  • Published: 06/02/2005
  • Est. Priority Date: 03/22/1991
  • Status: Active Grant
First Claim
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1. An apparatus for virtual memory mapping and transaction management for an object-oriented database system having at least one permanent storage means for storing data in at least one database, at least one cache memory for temporarily storing data addressed by physical addresses, and a processing unit, the processing unit including means for requesting data utilizing virtual addresses to access said data in the cache memory, means for mapping virtual addresses to physical addresses, and means for detecting when data requested by the requesting means is not available at the virtual address utilized by the requesting means, said apparatus comprising:

  • means operative in response to a detection by said detecting means for determining if the requested data is in the cache memory, means for transferring the requested data from the permanent storage means to the cache memory responsive to a determination by said determining means that the requested data is not in the cache memory, and means operative when requested data is in the cache memory for instructing the means for mapping to map the virtual addresses of the requested data to the physical addresses of the data in the cache memory.

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