Difference between revisions of "Data Science"
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What is a database? '''A collection of information organized to afford efficient retrieval.''' | What is a database? '''A collection of information organized to afford efficient retrieval.''' | ||
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Why do we need a database? | Why do we need a database? | ||
* Sharing | * Sharing | ||
Revision as of 00:59, 1 September 2013
The Three V's of Big Data
- Volume: number of rows/objects/bytes
- Variety: number of columns/dimensions/sources
- Velocity: number of rows/bytes per unit time
(Veracity: Can we trust this data?)
Data Model
Three components:
- Structures
- Constraints
- Operations
What is a database? A collection of information organized to afford efficient retrieval.
Why do we need a database?
- Sharing
- Data model enforcement
- Scale
- Flexibility