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select value between (start , end) optimisation
Posted by: Mathieu Pichon
Date: December 22, 2004 03:21AM

WHAT I HAVE :

Given a huge table that contains two (BIGINT) fields :
- start_field
- end_field.

There is indexes on
- start_field
- end_field

WHAT I NEED TO DO

I need to find record where :
- start_field < value AND end_field > value

WHAT HAPPEN

if value is small regarding all value it can take, using the start_field index is not efficient as it need to parse all the other for end_field condition

if value is big, using end_field is not efficient.

and if value is in the middle the querry takes very long time

HOW CAN I IMPROVE PERFORMANCE ?

Regarding that the average (start_field - end_field ) field is not so big ?

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select value between (start , end) optimisation
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December 22, 2004 03:21AM


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