Best way to query data with varchar (max) cloumn.

Question

Hi,
I have joined  three table and selected 15colmuns over a period of 6months it tooks 10sec .
I selected two more columns with varchar(max) datatype it took me 60sec.
whats the best way to select varchar(max) over a period?
Can anyone please help me on this?
Thanks,

Answer 1

I have joined  three table and selected 15colmuns over a period of 6months it tooks 10sec .
I selected two more columns with varchar(max) datatype it took me 60sec.
That appears to be normal behavior for any RDBMS.
You can use the LEFT function to limit transmission volume from server to client:
SELECT A.Title, A.DocumentSummary INTO tempdb.dbo.DocText
FROM Production.Document A
CROSS JOIN Production.Document B CROSS JOIN Production.Document C
CROSS JOIN Production.Document D CROSS JOIN Production.Document E;
-- (59049 row(s) affected)
SET STATISTICS TIME ON
DBCC DROPCLEANBUFFERS
SELECT A.Title, A.DocumentSummary FROM tempdb.dbo.DocText A
DBCC DROPCLEANBUFFERS
SELECT A.Title, Prefix=LEFT(A.DocumentSummary,10) FROM tempdb.dbo.DocText A
SET STATISTICS TIME OFF
SQL Server Execution Times:
CPU time = 172 ms, elapsed time = 787 ms.
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
(59049 row(s) affected)
SQL Server Execution Times:
CPU time = 62 ms, elapsed time = 560 ms.s.
Kalman Toth Database & OLAP Architect
SQL Server 2014 Database Design
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