<a href="http://g.adspeed.net/ad.php?do=clk&zid=15220&wd=468&ht=60&pair=as" target="_blank"><img style="border:0px;" src="http://g.adspeed.net/ad.php?do=img&zid=15220&wd=468&ht=60&pair=as" alt="i" width="468" height="60"/></a>
Log in
::
Register
::
Not logged in
Home
Tags
Articles
Editorials
Stairways
Forums
Scripts
Videos
Blogs
QotD
Books
Ask SSC
SQL Jobs
Training
Authors
About us
Contact us
Newsletters
Write for us
<a href="http://g.adspeed.net/ad.php?do=clk&zid=15491&wd=120&ht=300&pair=as" target="_top"><img style="border:0px;" src="http://g.adspeed.net/ad.php?do=img&zid=15491&wd=120&ht=300&pair=as" alt="i" width="120" height="300"/></a>
Recent Posts
Recent Posts
Popular Topics
Popular Topics
Home
Search
Members
Calendar
Who's On
Home
»
Article Discussions
»
Article Discussions by Author
»
Discuss Content Posted by Jeff Moden
»
Formatting Dates with 3 Character Months (SQL...
92 posts, Page 10 of 10
««
«
6
7
8
9
10
Formatting Dates with 3 Character Months (SQL Spackle)
Rate Topic
Display Mode
Topic Options
Author
Message
peter-757102
peter-757102
Posted Thursday, May 10, 2012 8:01 AM
SSC Veteran
Group: General Forum Members
Last Login: 2 days ago @ 9:19 AM
Points: 288,
Visits: 1,910
Jeff,
With runaway generation of rows I do not mean these rows end up in the result or are part of additional processing by the consuming parts of the query. But that rows are generated before the TOP operator takes effect when dealing with parallel execution plans. Not always, but frequent enaugh to cause issues of unpredictable large slowdowns. The processing is in the generation of the rows itself for large sets and not anything that depends on the rows that come out of the top operator.
It is a bug obviously and one that the connect issue can use an extra votes for :)
Post #1297899
Jeff Moden
Jeff Moden
Posted Thursday, May 10, 2012 8:04 AM
SSC-Dedicated
Group: General Forum Members
Last Login: Today @ 7:18 AM
Points: 33,112,
Visits: 27,038
Wow! I just read Paul's article. He really does do a nice job explaining some of these things.
To summarize, TOP apparently doesn't fix things for 2008 and above. You need to add OPTION(MAXDOP 1) to really get it to behave properly. That's ok because it still screams.
--Jeff Moden
"
RBAR
is pronounced "ree-bar" and is a "Modenism" for "
R
ow-
B
y-
A
gonizing-
R
ow".
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."
For better, quicker answers on T-SQL questions, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537/
For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/
Post #1297900
« Prev Topic
|
Next Topic »
92 posts, Page 10 of 10
««
«
6
7
8
9
10
Permissions
You
cannot
post new topics.
You
cannot
post topic replies.
You
cannot
post new polls.
You
cannot
post replies to polls.
You
cannot
edit your own topics.
You
cannot
delete your own topics.
You
cannot
edit other topics.
You
cannot
delete other topics.
You
cannot
edit your own posts.
You
cannot
edit other posts.
You
cannot
delete your own posts.
You
cannot
delete other posts.
You
cannot
post events.
You
cannot
edit your own events.
You
cannot
edit other events.
You
cannot
delete your own events.
You
cannot
delete other events.
You
cannot
send private messages.
You
cannot
send emails.
You
may
read topics.
You
cannot
rate topics.
You
cannot
vote within polls.
You
cannot
upload attachments.
You
may
download attachments.
You
cannot
post HTML code.
You
cannot
edit HTML code.
You
cannot
post IFCode.
You
cannot
post JavaScript.
You
cannot
post EmotIcons.
You
cannot
post or upload images.
Copyright © 2002-2013 Simple Talk Publishing. All Rights Reserved.
Privacy Policy.
Terms of Use.
Report Abuse.
