Invention Grant
US08495282B2 Flash-aware storage optimized for mobile and embedded DBMS on NAND flash memory 有权
闪存感知存储优化用于NAND闪存上的移动和嵌入式DBMS

Flash-aware storage optimized for mobile and embedded DBMS on NAND flash memory
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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