Enum TripleIndexType

Possible Triple Index types.

Namespace: VDS.RDF
Assembly: dotNetRdf.dll
Syntax
public enum TripleIndexType
Remarks

Index types are given Integer values with the lowest being the least useful index and the highest being most useful index. Non-Index based Patterns are given arbitrary high values since these will typically never be used as these items are usually inserted into a Graph Pattern after the ordering step.

When used to sort Patterns as part of query optimisation the patterns are partially ordered on the usefullness of their index since more useful indexes are considered more likely to return fewer results which will help restrict the query space earlier in the execution process.

Fields

Name Description
None

No Index should be used as the Pattern is three Variables
NoVariables

No Index should be used as the Pattern does not use Variables
Object

Object Index should be used
Predicate

Predicate Index should be used
PredicateObject

Predicate-Object Index should be used
Subject

Subject Index should be used
SubjectObject

Subject-Object Index should be used
SubjectPredicate

Subject-Predicate Index should be used

Extension Methods