100+ Equivalent queries PowerPoint (PPT) Presentations, Equivalent queries PPTs

Equivalent queries - PowerPoint PPT Presentation

Query Optimization

Query Optimization. Why Optimize?. Given a query of size n and a database of size m , how big can the output of applying the query to the database be? Example: R(A) with 2 rows. One row has value 0. One row has value 1. How many rows are in R x R? How many in R x R x R?

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437 views • 38 slides

Midterm Review

Midterm Review. October 20. Announcements. You should look on Piazza for your room assignments! There is no class on Wednesday It is being used for makeup exams. GOOD LUCK!. Exam Details. 90 Minutes. 7 to 8:30pm Closed Book, Closed Notes. Some notes provided. (They are posted.)

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436 views • 34 slides

CSC 405 Introduction to Computer Security

CSC 405 Introduction to Computer Security. Topic 6.3: Database Inference Control. Outline. Inference attacks Direct attacks (no inference needed) Indirect attacks via aggregations Tracker attacks Inference via linear systems Inference via database constraints Inference control

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545 views • 25 slides

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Equivalent queries - PowerPoint PPT Presentation

Query Optimization

Midterm Review

CSC 405 Introduction to Computer Security