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INTRODUCTION TO ECONOMICS:

database statistics
The main factors affecting the performance of the execution strategy are: Intermediate relationships are created during execution. when following up If the job is on another site, you must submit an intermediate relationship.

### ECO401 HIGHLIGHTED HANDOUTS

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ECO401-INTRODUCTION TO ECONOMICS
There is no direct trade-off between statistical accuracy and cost. By managing this, more accurate statistics are expensive. for each relationship  R[A1, A2, …, An] is R1, …, is fragmented by Rr, and the statistical data is usually:
1. The length of each attribute: length(Ai) Number of distinct values ​​for each attribute in each piece: card (πAi(Rj))
The maximum and minimum values in the domain of each attribute: min(Ai), max(Ai) Cardinality of each domain: card (dom [Ai]), and cardinality of each domain.

#### ECO401 HIGHLIGHTED HANDOUTS-INTRODUCTION TO ECONOMICS

Piece: Card (Rj)
SJF(R, S) = Card(R ⋈ S) / (Card(R) combining optional elements for some of the relationships
* card) The cardinality
of Interim Results Database statistics is useful for evaluating the cardinality of intermediate results.
##### ECO401 HIGHLIGHTED HANDOUTS PDF-INTRODUCTION TO ECONOMICS

Query. Databases generally have two simplification assumptions. that much In a relationship,
the distribution of attribute values must be uniform, and all attributes must This means that the value of one attribute does not affect the value of another attribute.