Question

My question about searching queries with .NOT . I’m confused which is faster for loading and process SQL query, I have implemented SQL Server query and my query getting larger and slow of fetching data even though I’m using indexing search with SQL Server 2012.

So is there any way to make my query faster with linq?

Here is simple of my query

SELECT
    counting 
FROM  
    xxxxxxx 
WHERE
   (Contains(BOOLEANTEXT, '"FORM"')) 
   AND ((Contains(BOOLEANTEXT, ' "FORM"  and  "WARRANT" ' ))) 
   AND ((Contains(BOOLEANTEXT, ' "RETURN"  or  "RESPECTING"  or  "ELECTION"  or  "EXPENSES" ')))  
   OR ((Contains(BOOLEANTEXT, 'Near((FORM,WARRANT,RETURN,RESPECTING,ELECTION,EXPENSES), 1000, TRUE)' ))) 
   AND ((Contains(BOOLEANTEXT, 'FORMSOF(INFLECTIONAL, FORM,WARRANT,RETURN,RESPECTING,ELECTION,EXPENSES)' ))) 
   AND ((Contains(BOOLEANTEXT, 'FORMSOF(THESAURUS, FORM,WARRANT,RETURN,RESPECTING,ELECTION,EXPENSES)' ))) 
ORDER BY 
   FORMTITLE ASC

Answer 1

No, there is no way of improving the performance of this query with LINQ.

There will even be a slight overhead when using LINQ, but that will for sure be neglectable in this case.

LINQ will eventually also produce SQL and execute it on your database. So LINQ will not provide any performance benefits.

If you want to improve performance, you’ll have to improve this SQL-statement itself.

Looking at your WHERE-clause, there are no brackets to combine any of the AND‘s to that single OR. Is that on purpose? Your results will now satisfy all AND-conditions OR ((Contains(BOOLEANTEXT, 'Near((FORM,WARRANT,RETURN,RESPECTING,ELECTION,EXPENSES), 1000, TRUE)' )))

This might get you a lot more results than you are expecting.

---

Some more on the AND‘s and OR.

Your WHERE-clause is now similar to:

(condition1 AND condition2 AND condition3 AND condition5 AND condition6)
OR condition4

I suppose, you actually mean something like:

condition1 AND condition2
AND (condition3 OR condition4)
AND condition5 AND condition6

I don not say your WHERE-clause is wrong. I only suspect you need some extra brackets somewhere, to get the WHERE-clause you had in mind.

But before adding brackets, let’s remove some to improve readability. This will do the same as yours:

WHERE
   Contains(BOOLEANTEXT, '"FORM"')
   AND Contains(BOOLEANTEXT, ' "FORM"  and  "WARRANT" ')
   AND Contains(BOOLEANTEXT, ' "RETURN"  or  "RESPECTING"  or  "ELECTION"  or  "EXPENSES" ')
   OR Contains(BOOLEANTEXT, 'Near((FORM,WARRANT,RETURN,RESPECTING,ELECTION,EXPENSES), 1000, TRUE)') 
   AND Contains(BOOLEANTEXT, 'FORMSOF(INFLECTIONAL, FORM,WARRANT,RETURN,RESPECTING,ELECTION,EXPENSES)') 
   AND Contains(BOOLEANTEXT, 'FORMSOF(THESAURUS, FORM,WARRANT,RETURN,RESPECTING,ELECTION,EXPENSES)')