Formatting T-SQL Performacne Boost?????

May 5, 2006

Hey, I'm using PHP with MSSQL, and I'm not having any performace problems or anything, but at the same time I'm trying to optimise our system to work as best as it can as it's going to have a very heavy load once we launch.

I'm running into the age old problem with the battle between optimizing your code and still keeping it readable. I read somewhere that using whitespace in SQL queries is really bad as it take a lot more bandwidth and puts more stress on SQL Server parsing the SQL it is sent. Right now I have a query like so:-

<?php

$selQ = 'SELECT
n.pknewsID AS newsID,
n.title,
n.full_text,
n.publish_up AS datePublished,
CONCAT(u.fname," ",u.lname) AS author,
i.loc AS img_file,
i.descr AS img_caption
FROM tblnews n
LEFT JOIN tblusers u
ON n.fkcreated_by = u.pkuserID
LEFT JOIN tblnews_images i
ON i.fknewsID = n.pknewsID
WHERE
n.pknewsID = '.$articleID.' AND
n.published = 1
LIMIT 1';


$selQ = $DB->setQuery($selQ);

/**
* $DB->setQuery basically is a preg_replace function that
* removes all the tabs in the query string, and replaces them
* with a single space.
*
*/

echo $selQ;


/**

* Printed out it looks like this :-
* SELECT
* n.pknewsID AS newsID
* n.title
* n.full_text
* n.publish_up AS datePublished
* CONCAT(u.fname," ",u.lname AS author,
* i.loc AS img_file,
* i.descr AS img_caption,
* FROM tblnews n
* LEFT JOIN tblusers u
* ON n.fkcreated_by = u.pkuserID
* LEFT JOIN tblnews_images i
* ON i.fknewsID = n.pknewsID
* WHERE
* n.pknewsID = 6 AND
* n.published = 1
* LIMIT 1
*
*/
?>

So the question I have is, does it really matter how the SQL query is sent? I mean, if I put it all on one line (which would kinda suck as it is harder for me to read then), would it speed up transactions significally?

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SQL Server Performacne...

Mar 16, 2007

Records are added to a table which can grow in millions with date of the creation. Views (also cascade of views) is used to calculate the grouped data:

for example:

1) here is a view to calculate aggregate data:

CREATE VIEW dbo.All_Campaign_Calls AS
SELECT TOP 100 PERCENT NUMCAMPAGNE AS Campaign_Num, OWNERNAME AS owner_name, STATUTPROSPECT AS STATUS, CAST(CONVERT(varchar(10), DATESELECT, 103) AS
datetime) AS call_date
FROM dbo.ProspectCampagne
WHERE (APPELE = '1')

this view shows from a prospect table for a given campagne, by date and by person used to call

2) here a view that uses the previous view to aggregate data: number of calls by date:

SELECT TOP 100 PERCENT Campaign_Num, call_date, SUM(nb_Total_Calls) AS nb_Total_Calls_day FROM dbo.Calls_Per_Campaign_Date_Status
GROUP BY Campaign_Num, call_date
ORDER BY Campaign_Num, call_date

3) here is a view that uses other views to agrregate data by data AND by person called:

SELECT TOP 100 PERCENT Campaign_Num, call_date, STATUS, SUM(Nb_Calls) AS nb_Total_Calls FROM dbo.Calls_Per_Campaign_Dt_Own_Stat
GROUP BY Campaign_Num, call_date, STATUS ORDER BY Campaign_Num, call_date, STATUS

etc.....

In SQL server DB; do the calculations:

We have views that gather, agregate data...

To know the performance of the server with 100k, 500k, 1M 2, 3, 4 million records

How to find that performacne. ????



Give me your advice.

Thanks

Babu B

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ChildTable
---------------
Id uniqueidentifier <PK>
ParentId uniqueidentifier <FK>
CreationDate DateTime

ParentTable
-----------------
Id uniqueidentifier <PK>
CreationDate DateTime


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All records with a specific ParentId will have very similiar CreationDates.

Now, my question is, will Partitioning the ChildTable boost performance for me? In case it will, what column(s) would define the Partitions? If I do it by CreationDate, a select-query like the one above will have to scan all partitions anyway, doesn't it? Doing it by Id isn't soo easy either I guess? If it helps, it might be possible to change the primary keys in the tables to have sequential guids.

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where as I prefer this format:

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----------
SET NOCOUNT ON
DECLARE @errorCount INT
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-------------------
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I have gotten this far....

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