ECO401 HIGHLIGHTED HANDOUTS-INTRODUCTION TO ECONOMICS HANDOUTS PDF DOWNLOAD GETCAREERALERT.COM

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ECO401 HIGHLIGHTED HANDOUTS
ECO401 HIGHLIGHTED HANDOUTS

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
ECO401 HIGHLIGHTED HANDOUTS
ECO401 HIGHLIGHTED HANDOUTS
 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.
ECO401 HIGHLIGHTED HANDOUTS PDF DOWNLOAD-INTRODUCTION TO ECONOMICS
ECO401 HIGHLIGHTED HANDOUTS
ECO401 HIGHLIGHTED HANDOUTS