Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2007-05-16
2010-12-21
Kim, Matt (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711SE12055, C711S170000
Reexamination Certificate
active
07856522
ABSTRACT:
Reliable storage for database management systems (DBMS) running on memory devices such as NAND type flash memory utilizes minimum I/O overhead and provides maximum data durability. A virtual page map is utilized between the flash memory and a page access component to record changes to the DBMS pages and prevent overwriting or data loss. There is no need for journaling and logging, and performance is increased by reducing the write and erase counts on the flash memory. The logical page numbers of the DBMS are mapped to physical page numbers in the page map, such that the virtual page map allocates an available page from the physical pages when changes to a page occur, and the updated information is stored in the allocated page. The allocated page number is mapped to the logical page number of the original page, thus maintaining a modified page representation while preventing physical in-place updates.
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patent: 2007/0294494 (2007-12-01), Conti et al.
Kang SongHee
Ko BongSoo
Lee Sang-Cheol
Yoo HyungGook
Ahmed Hamdy S
Kim Matt
Oracle International Corporation
Townsend and Townsend / and Crew LLP
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