What was your coolest SQL optimization, on a slow performing query?

Question

Just speaking to a colleague of mine. He was walking with a hop in his step, on the way to the coffee machine.

I asked him \"what\'s with the \'swarmy\' walk?\", he said

Answer 1

One Word, Dynamic Queries

If you serching with large numbers of parameters you can discount them from the SQL string. This has sped up my queries dramatically and with reletive ease.

Create PROCEDURE dbo.qryDynamic
( 

@txtParameter1 nvarchar(255),
@txtParameter2 nvarchar(255),

AS
SELECT     qry_DataFromAView.*
FROM         qry_DataFromAView
BEGIN

    DECLARE @SQL nvarchar(2500)
    DECLARE @txtJoin nvarchar(50)

    Set @txtJoin = ' Where '

    SET @SQL = 'SELECT     qry_DataFromAView.*
                FROM         qry_DataFromAView'

    IF @txtParameter1 is not null
    Begin
        SET @SQL=@SQL + @txtJoin + ' Field1 LIKE N''%'' + @dynParameter1 + N''%'') '
        Set @txtJoin = ' And '
    end


    IF @txtParameter2 is not null
    Begin
        SET @SQL=@SQL + @txtJoin + ' Field2 LIKE N''%'' + @dynParameter2 + N''%'') '
        Set @txtJoin = ' And '
    end

    SET @SQL=@SQL + ' ORDER BY Field2'


    Exec sp_executesql @SQL, N'@dynParameter1 nvarchar(255), @dynParameter2 nvarchar(255)',  @dynParameter1 = @txtParameter1 ,@dynParameter2 = @txtParameter2

END
GO