Diseño fisico 1
Upcoming SlideShare
Loading in...5
×
 

Diseño fisico 1

on

  • 327 views

Diseño fisico

Diseño fisico

Statistics

Views

Total Views
327
Views on SlideShare
327
Embed Views
0

Actions

Likes
0
Downloads
0
Comments
0

0 Embeds 0

No embeds

Accessibility

Categories

Upload Details

Uploaded via as Adobe PDF

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Diseño fisico 1 Diseño fisico 1 Presentation Transcript

  • DATA WAREHOUSINGPhysical Design
  • 2
  •  Logical database design  What are the facts and dimensions?  Goals: Simplicity, Expressiveness  Make the database easy to understand  Make queries easy to ask
  •  Physical database design  How should the data be arranged on disk?  Goal: Performance ▪ Manageability is an important secondary concern  Make queries run fast
  •  Trade-off between query performance and load performance
  •  To make queries run fast:  Precompute as much as possible  Build lots of data structures ▪ Partitions ▪ Materialized views ▪ Indexes
  •  But…  Data structures require disk space to store  Building/updating data structures takes time  More data structures → longer load time
  •  Base data  Fact tables and dimension tables  Fact table space >> Dimension table space Indexes  100%-200% of base data Aggregates / Materialized Views  100% of base data Extra data structures 2-3 times size of base data
  •  The Data Warehouse Toolkit.Second Edition.The Complete Guide to Dimensional Modeling.Ralph Kimball.Margy Ross