Storage

In-Page Logging B-Tree for Flash Memory

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Executive Summary

Since NAND flash memory was invented as a sector addressable non-volatile storage medium about two decades ago, its density has increased approximately twice annually and the trend is expected to continue until year 2012. Due to its superiority such as low access latency and low energy consumption, flash-based storage devices are now considered to have tremendous potential as an alternative storage medium that can replace magnetic disk drives. On the other hand, due to the erase-before-write limitation of flash memory, updating even a single record in a page results in invalidating the current page containing the record and writing a new version of the page into an already-erased area in flash memory.

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