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Flash Disk: A High-Speed Storage Medium for Digital Devices

Learn about the advantages of flash disk over traditional magnetic disks, its technical aspects, applications, and ongoing research in data management related to flash technology.

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Flash Disk: A High-Speed Storage Medium for Digital Devices

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  1. Flash数据管理 Zhou da 2007-9-9

  2. Jim Gray Microsoft December 2006 Tape is DeadDisk is TapeFlash is Disk

  3. 应用范围 物理特性

  4. Flash disk is a popular storage medium for digital device

  5. Flash disk develops at a high speed

  6. The market • Oracle Berkeley DB (non SQL) • Oracle Database Lite 10g (SQL) • Sybase SQL Anywhere - SQL Database Software, Embedded Database • IBM DB2 Everyplace • Microsoft SQL Server 2005 Compact Edition

  7. Jim Gray Microsoft December 2006 Tape is DeadDisk is TapeFlash is Disk

  8. Cooperation • INRIA(法国国家信息与自动化研究所)

  9. Flash硬盘结构

  10. 磁盘结构

  11. Higher of speed of read and write. About the 300 times and 50 times of that of the hard disk. Smaller size Less power consumption Data can been preserved longer Shock resistance The advantage of flash disk Picture1 Flash disk Picture2 Magnetic disk

  12. Read/Write/Erase Asymmetric speed of read/write/erase Erase before rewrite Limited erase times Read/write page, erase block, 1 block=64 pages Read/Write The same speed of read/write Rewrite in-place No limited write times Read/write byte Note: one flash page contains 2048 bytes Difference between flash disk and magnetic disk

  13. 数据管理研究带来的问题------ Wandering trees

  14. Sang-Won Lee 尹少宜 索引相关工作 Sigmod 2007

  15. 索引相关工作 • Related work • Sang-Won Lee: leaf nodes in the B+ tree • Shaoyi yin: index the primary key • Remain work: • Secondary key index

  16. 数据管理研究带来的问题------事务处理 • Related work • Transaction on the log file system • Recovery • One of the signature features of database systems is that they provide transactions and guarantee that in the event of a crash, the system can be brought back to a consistent state. We intend to explore new mechanisms for storing recovery information to achieve higher performance on flash memory. ------ MIT Research Abstracts - 2007

  17. 数据管理研究带来的问题------查询优化 • 磁盘的查询优化需要尽量避免对分散的数据的读取，从而建立了主索引和大量副索引。 • Flash硬盘上相当于可以建立任意多的主索引，所以索引性能会得到极大的提高

  18. 数据管理研究带来的问题------并行计算

  19. 数据管理研究带来的问题------并行计算

  20. 数据管理研究带来的问题------混合式系统 • Hybrid flash/magnetic systems. Magnetic disk will continue to have a lower cost per byte than flash memory for the foreseeable future. We plan to investigate methods for automatically migrating portions of database from magnetic disk to flash memory to boost performance in systems where the database can not be economically stored entirely on flash memory.

  21. Flash数据管理 谢 谢 

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