Chapter 01
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Chapt er 1 - 1 File Structures Cha pter 1 - 1 M.Folk and B.Zoellick, File Structures, Addison Wesley. E. Horowitz, S. Sahni, and S. Anderson-Freed, Fundamentals of Data Structures in C , Computer Science Press.
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File Structures File Structures File Structures File Structures
Transcript of Chapter 01
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Chapter 1 - 1
OF fjj b
File Structures
Chapter 1 - 1OF fjj b
z M.Folk and B.Zoellick, File Structures, Addison Wesley.z E. Horowitz, S. Sahni, and S. Anderson-Freed,
Fundamentals of Data Structures in C, Computer Science Press.
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Chapter 1 - 2
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z File Structures + Advanced Data StructuresFile File, I/O Processing, Access MethodExternal SortingIndexing
Hashing, Heap Structures Search Structures: AVL Tree, 2-3 Trees, B-Tree,
z Not IncludesDynamic Programming, Divide-And-ConquerNP-Hard and NP-Complete Problems,
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&168
Hashing (2)15External Sorting(2)7Hashing (1)14External Sorting(1)6B-Tree (3)13Field, Record, Page5B-Tree (2)12Buffering, Blocking4Red-Black Tree, B-Tree (1)11Storage Device3AVL Tree, 2-3, 2-3-410File System Call2
IndexingNF9rN:'1
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Chapter 1 - 3
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Chapter 1
Introduction to FileStructures
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1. The Heart of File Structure Designz Motivation
Disks are slow. RAM : 120 nanoseconds Disk : 10 ~ 30 milliseconds
Disk Enormous capacity at much less cost than RAM Non-volatile storage device
z GoalAccessing to all the capacity without making ourapplications spend a lot of time waiting for the disk
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Chapter 1 - 4
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2. A Short History of File Structure Design
z General goal of research in file structures
One access to the disk. Ideal Only two or three trips to the disk. Practical Grouping information for fewer trips
File ( File )
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z History Sequential file in tape device Direct access of disk using index Simple index ( sequentially stored ) Tree structured index
Binary search tree, AVL tree B-tree, B+-tree: logkN access
Hashing Extendible, dynamic hashing Multi-key access method Spatial access method: R-tree, K-D-B tree
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Chapter 1 - 5
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3. A Conceptual Toolkit: File Structure Literacy
z File structure Sequential Access Method Indexed Sequential Access Method Direct Access Method
z Disk I/O Buffering Blocking Bucket Concept Splitting & Merging
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Chapter 1 - 6
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Chapter 1 - 7
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Inventory Master File Maintenance Audit Listing Page1
Update Product Quantity Quantity ReorderCode Code On Hand On Order Point ------ACTION------
A DR1112 400 50 400 AdditionC DR2000 350 Change -- Qty on handA DR3814 239 0 200 AdditionA DR3914 150 0 50 AdditionD DR4000 DeletionC GR5000 100 Change -- Qty on orderC GR5014 45 Change -- Reorder pointA SA3012 100 25 110 AdditionC SA4310 125 Change -- Qty on hand
[ 1.5] NN
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Chapter 1 - 8
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Inventory Master File Maintenance Error Listing Page1
Update Product Quantity Quantity ReorderCode Code On Hand On Order Point ------ERROR MESSAGE------
D DR3000 Invalid Delete -- Master Not On FileC GR5013 100 Invalid Change -- Master Not On FileA HM1032 125 0 75 Invalid Add -- Master Already On FileX HM1308 Invalid Update codeY SA3014 Invalid Update codeA SA4201 50 0 30 Invalid Add -- Master Already On FileD SD1103 Invalid Delete -- Master Not On File
[ 1.6] N
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Inventory Master File Listing Page1
Product Quantity Quantity ReorderCode On Hand On Order Point
DR1015 25 0 30DR1112 400 50 400DR2000 350 25 375DR3814 239 0 200DR3914 150 0 50GR2001 74 10 80GR3034 25 10 30GR5000 500 100 525GR5014 45 0 45HM1032 123 0 120HM1308 75 0 102SA3012 100 25 110SA4201 50 0 30SA4310 125 0 100SA5012 3 0 5
[ 1.7] &JrN
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Chapter 1 - 9
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Inventory Master File Listing of Records With Page 1Quantity On Hand BELOW Recorder Point
Product Quantity Quantity ReorderCode On Hand On Order Point
DR1015 25 0 30HM1308 75 0 120SA5012 3 0 5
[ 1.8] &JrRsN
Chapter 1 - 17OF fjj b
Transactions Read 578Adds 461
Processed 446Invalid 15
Changes 87Processed 79Invalid 8
Invalid Update Codes 1Master Records Read 28,406Master Records Written 28,825
[ 1.9] JrN
