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NAND As embedded systems of continuous improvement and development, application access to data terminals ability to put forward higher requirements, it is necessary to use a database management system.
As the excellent characteristics of NAND flash memory, most embedded systems it as a storage medium.
But unlike traditional disk, write data to the NAND flash memory can not be the basis of the data in the original cover but must erase operation has been performed for blocks, each block erase operation is performed on the number of times is limited.
The database write operation to occur a lot of times, resulting in an increase in the erase operation, shorten the period of use of NAND flash memory.
How to overcome this characteristic is NAND flash memory has been much concern. Practical application in the database, the index number is a lot of writing, which use NAND flash duration will have an impact, so the need to design one for the physical characteristics of NAND flash memory indexing mechanism to minimize the NAND flash write and erase operation.
Every write operation corresponds to a Log Entry, when the data to be written to the database system records created record buffer fills, the corresponding log record is written to the NAND flash memory.
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Log-Mode index tree merge a number of write operations, reducing the need for NAND flash flash, flash extended period of use. Finally build experimental platform, in the embedded Linux system, the improved indexing applied to the SQLite3 embedded database indexes each data comparison test results show that the improved scheme effectively make use of flash memory may be long, but also improve the data Storage share.Published: Mon, 5 Dec Document markup is a process of writing codes in a document to identify structure and format of a final appearance of a document.
Markup was done by copy editor writing instruction on document that was followed by typesetter, before the computerization of printing industry.
90% of the time, speakers of English use just 7, words in speech and writing. These words appear in red, and are graded with stars.
One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent. Basic method is to read and write requests into a plurality of segments, the plurality of parallel execution on a plane through a more balanced allocation of I / O load, can significantly improve the overall solid state disk memory read and write performance.
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