# Announcements

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The tree must be balanced, that is, every path from the root node must have the same length. ... Attribute oval. Relationship diamond. Link - line. 9 ...
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Title: Announcements 1 Announcements
• Project Due Friday 500 PM
• Group Presentations
• 10 minutes
• Describe project (ERD), discuss any challenges, show us some queries
• Final Monday, December 20 _at_ 9am in KH006
• Optional early exam Friday, December 17 _at_ 1pm in KH006
• 2 Final Review
• Lecture 24
• 3 Approximate Composition of the Exam
• 70 - Chapters 3-6, and embedded programs (excluding relational algebra)
• 10 - Special Topics
• Not all questions will be worth the same
• Youll have to answer enough to add up to the right point value
• 10-15 Chapters 2, 8, IR, and relational algebra (Short answers, T/F, fill in the blank, multiple choice)
• 5-10 Physical Storage
• 4 Review Physical Storage -Application
• A disk block is 2048B
• A record is 450B
• There are 10,000 records
• What is the block factor?
• What is the number of blocks needed to store entire table?
• 5 Example B Tree 270 300 100 200 15 60 230 270 1 8 60 75 80 200 215 230 240 15 25 30 1 8 120 150 100 115 150 165 120 145 6 Rules for Constructing a B Tree
• If the root is not a leaf, it must have at least two children
• If the tree is order n, each interior node (that is, all nodes except the root and leaf nodes), must have between n/2 and n occupied pointers (and children). If n/2 is not an integer, roundup to determine the minimizes number of pointers
• 7 Rules for Constructing a B Tree
• The number of key values contained in a non-leaf node is 1 less than the number of pointers
• If the tree has order n, the number of occupied key values in a leaf node must be between (n-1)/2 and n-1. If (n-1)/2 is not an integer, round up to determine the minimum number of occupied key values.
• The tree must be balanced, that is, every path from the root node must have the same length.
• 8 Symbols used in E-R Diagram
• Entity rectangle
• Attribute oval
• Relationship diamond
• 9 Scenario Organization of Olympic Facilities
• The Olympic facilities are divided into sports complexes. Sports complexes are divided into one-sport and multisport types. Multisport complexes have areas of the complex designed for each sport with a location indicator (e.g. center, NE corner, etc.). A complex has a location, chief organizing individual, total occupied area, and so on. Each complex holds a series of events (e.g., the track stadium may hold many different races). For each event there is a planned date, duration, number of participants, number of officials, and so on. A roster of all officials will be maintained together with the list of events each official will be involved in. The two types of facilities (one-sport and multisport) will have different types of information. For each type, the approximate budget will be kept.
• 10 Olympic EER Diagram 11 Olympic Relations 12 Functional Dependencies and Normalization 13 Olympic DDL and SQL
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