Execution Plans

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Execution Plans

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Dionisio T Manzo SSC Enthusiast Points: 173 More actions · Answer 1

A nice topic but it needs to explain what does the statistics is all about so that the execution plan can say the sql statement is optimized.

J Wright SSC Veteran Points: 211 More actions · Answer 2

Good article. Used the exact names of the index methods many times(so it should be easy to find in the future).

However, who really needs help in tuning a simple (select somecolumn1, somecolumn2, somecolumn3 from sometable) query? Don't get me wrong, the article had value, but I never have perfomance troubles with the simple queries. The ones with 4 or more joins involved cause troubles for us to tune.

It's not just this article... I'd love to see more exaples that are closer to real world usage of a SQL server using realtional data...

I'd love to see a follow up article on this that would give us a deeper understanding of SQL tuning.

Pankaj Khanna Say Hey Kid Points: 707 More actions · Answer 3

Excellent article. It is really well explained.

Pankaj Khanna
Database Administrator - SQL Server 2000

Keep hope to keep you intact...

vidhya-373059 Valued Member Points: 61 More actions · Answer 4

Goodone.Even Beginner can Understand from his explanation.Thanks Vijay!!!

kakarato SSC Rookie Points: 27 More actions · Answer 5

kakarato

SSC Rookie

Points: 27

October 26, 2006 at 3:37 am

#668109

Good Thumbs UP. Must read for beginner.

Mohan Mariyappa Old Hand Points: 357 More actions · Answer 6

As long as one understand what author is trying to explain, what language or for that matter grammer do not matter. One needs to understand, he is not teaching English. Great work VijayKumar.

kannanchery SSC Veteran Points: 206 More actions · Answer 7

Vijay,

Good Explain and i like the way of explaining.

ganeshc27 SSC Eights! Points: 972 More actions · Answer 8

ganeshc27

SSC Eights!

Points: 972

April 21, 2007 at 2:29 am

#701831

Nice article.

Regards,

Ganesh

chandrajit.samanta Valued Member Points: 51 More actions · Answer 9

Date: 14th November 2007

Hi Vijay!

I am Chandrajit Samanta, working in a product based s/w org (Metrica Systems Pvt. Ltd.) in Bangalore. We are using SQL Server 2000, C#, ASP.NET for our product. My work is mainly database intensive. Frequently I have to deal with heterogeneous database environment like Informix, Oracle, Sql Server simultaniously.

I have to fetch records from Informix, oracle database to our SQL Server Database. For which I have to create several DTS.

But the problem is, original tables (Informix,Oracle) has billions of records. For that to run one simple query like (Select * from Table_name where dtDate > '2007-11-01 17:00:00.000') in DTS it tooks 25min - 35min time.

We have only "Read Only " access i.e. select priviledge to all those (Informix,Oracle) database.

Please tell me how to improve such query so that this query running time is minimized.

I am waiting for your response.

Regards,

Chandrajit Samanta

chandrajit.samanta@gmail.com

MBM(Systems),B.E.(Electrical)

9986044300, Bangalore

aspirant.dba SSC Eights! Points: 951 More actions · Answer 10

Good Job Vijay & appreciate your sharing attitude.

Please continue posting such in future too.

bharathi8179 SSC Enthusiast Points: 122 More actions · Answer 11

Very good article for a beginner who does not have any idea about the execution plan. Thank you:)

a-848662 SSC-Addicted Points: 462 More actions · Answer 12

When giving examples, there is no need to blunder through every possible case of Table Scans before "realizing" MS SQL will only use the index scan on the column that has been indexed.

Although this is the way a beginner would do it while playing with MS SQL, there is no need to write it in your article. This only distracts the reader. It's nice to hear a different flavour of english but in many cases the meaning of your sentences was actually incorrect.

Jeff Moden SSC Guru Points: 1004406 More actions · Answer 13

phoqueme (1/27/2009)
When giving examples, there is no need to blunder through every possible case of Table Scans before "realizing" MS SQL will only use the index scan on the column that has been indexed.
Although this is the way a beginner would do it while playing with MS SQL, there is no need to write it in your article. This only distracts the reader. It's nice to hear a different flavour of english but in many cases the meaning of your sentences was actually incorrect.

Heh... all that from someone with a handle like "phoqueme". Grow up.

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

Srinivas Donavalli Valued Member Points: 68 More actions · Answer 14

Excellent article, I really like your logical approach and elegant examples. Even I did the same kind of research as you have domne on this. Both are very matching. But i lerant few more points from this article.

nigel.meakins SSC Veteran Points: 220 More actions · Answer 15

Very wordy verbose article that could have been summed up in a quarter of the space. The broken English made it less fluid to read although generally understandable. Some key points missed regarding the basics of the internals of the optimiser and why some methods are more favourable than others.