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CSE 373: Data Structures and Algorithms

CSE 373: Data Structures and Algorithms. Lecture 24: B-Trees. Disk Based Data Structures. All data structures we have examined are limited to main memory Have been assuming data fits into main memory Counter-example: transaction data of a bank > 1 GB per day

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CSE 373: Data Structures and Algorithms

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  1. CSE 373: Data Structures and Algorithms Lecture 24: B-Trees

  2. Disk Based Data Structures • All data structures we have examined are limited to main memory • Have been assuming data fits into main memory • Counter-example: transaction data of a bank > 1 GB per day • uses secondary storage (hard disks, tapes, etc) • operations: insert, delete, searches • Idea: Make a search tree that is secondary storage enabled

  3. Memory Hierarchy • Big-Oh assumes all operations take the same amount of time • Is this really true? • Cycle – time it takes to execute an instruction

  4. Cycles to access: CPU Registers 1 tens Cache hundreds Main memory Disk millions

  5. Hard Disks • Large amount of storage but slow access • Identifying a page takes a long time • Pays to read or write data in pages (i.e. blocks) of 0.5 – 8 KB in size

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