<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 Hugo Kornelis
»
Table space usage 1
40 posts, Page 1 of 4
1
2
3
4
»
»»
Table space usage 1
Rate Topic
Display Mode
Topic Options
Author
Message
Hugo Kornelis
Hugo Kornelis
Posted Tuesday, November 08, 2011 11:20 PM
SSCertifiable
Group: General Forum Members
Last Login: Today @ 3:21 AM
Points: 5,244,
Visits: 7,062
Comments posted to this topic are about the item
Table space usage 1
Hugo Kornelis, SQL Server MVP
Visit my SQL Server blog:
http://sqlblog.com/blogs/hugo_kornelis
Post #1202625
vk-kirov
vk-kirov
Posted Tuesday, November 08, 2011 11:37 PM
Hall of Fame
Group: General Forum Members
Last Login: Yesterday @ 6:30 AM
Points: 3,192,
Visits: 4,151
Nice and easy question.
I am very surprised that by now I am the only one (out of twenty) with the correct answer
Post Attachments
Answers.png
(
359 views,
3.41 KB
)
Post #1202633
palotaiarpad
palotaiarpad
Posted Wednesday, November 09, 2011 12:25 AM
SSC Eights!
Group: General Forum Members
Last Login: Yesterday @ 12:06 AM
Points: 849,
Visits: 323
The space used to store nullable fields is the only bottleneck. I missed it.
Post #1202652
Håvard
Håvard
Posted Wednesday, November 09, 2011 12:49 AM
SSC-Enthusiastic
Group: General Forum Members
Last Login: Tuesday, January 08, 2013 5:51 AM
Points: 145,
Visits: 140
A good question!
It was not easy to get it right, I really learned something.
Post #1202660
440692 I am just a number
440692 I am just a number
Posted Wednesday, November 09, 2011 1:08 AM
SSCommitted
Group: General Forum Members
Last Login: Wednesday, May 22, 2013 3:46 AM
Points: 1,631,
Visits: 2,031
whoop whoop! I learnt something
But I got the answer wrong
Post #1202670
Paul White
Paul White
Posted Wednesday, November 09, 2011 1:26 AM
SSChampion
Group: General Forum Members
Last Login: Today @ 1:03 AM
Points: 10,990,
Visits: 10,543
Good question. The explanation could have been improved very slightly:
"SQL Server will use the same amount of storage for a column whether its value is NULL or a "real" value."
This is true for fixed-length types (both DATETIME and NCHAR used in the example are fixed-length) but variable length columns e.g. of VARCHAR type use no room in the data row - the null bitmap is used to distinguish between NULL and an empty string.
Paul White
SQL Server MVP
SQLblog.com
@SQL_Kiwi
Post #1202679
kapfundestanley
kapfundestanley
Posted Wednesday, November 09, 2011 1:51 AM
Right there with Babe
Group: General Forum Members
Last Login: Monday, May 20, 2013 1:47 AM
Points: 778,
Visits: 1,047
Nice question.Hough difficult for me.Really learnt something thanks.
“When I hear somebody sigh, ‘Life is hard,’ I am always tempted to ask, ‘Compared to what?’” - Sydney Harris
Post #1202695
Lucy Dickinson
Lucy Dickinson
Posted Wednesday, November 09, 2011 2:02 AM
Valued Member
Group: General Forum Members
Last Login: Yesterday @ 9:01 AM
Points: 71,
Visits: 81
Really enjoyed this question .. pity I got it wrong but I have definitly learnt something!:
Lucy Dickinson
BI SQL Developer
Post #1202698
Hugo Kornelis
Hugo Kornelis
Posted Wednesday, November 09, 2011 2:05 AM
SSCertifiable
Group: General Forum Members
Last Login: Today @ 3:21 AM
Points: 5,244,
Visits: 7,062
Thanks, all, for the kind words!
SQL Kiwi (11/9/2011)
Good question. The explanation could have been improved very slightly:
"SQL Server will use the same amount of storage for a column whether its value is NULL or a "real" value."
This is true for fixed-length types (both DATETIME and NCHAR used in the example are fixed-length) but variable length columns e.g. of VARCHAR type use no room in the data row - the null bitmap is used to distinguish between NULL and an empty string.
Good addition, Paul. For varying length data, my explanation is technically still correct, but indeed incomplete. For varying legth data, NULL takes the same amount as the shortest possible "real" value (which is teh empty string for varchar and nvarchar, and a zero-length binary string for varbinary).
Advance warning as a special service for those who take the time to read the discussion - the next question in this series (scheduled to go live in about a week) will involve some heavy arithmetic!
Hugo Kornelis, SQL Server MVP
Visit my SQL Server blog:
http://sqlblog.com/blogs/hugo_kornelis
Post #1202699
Paul White
Paul White
Posted Wednesday, November 09, 2011 2:39 AM
SSChampion
Group: General Forum Members
Last Login: Today @ 1:03 AM
Points: 10,990,
Visits: 10,543
Hugo Kornelis (11/9/2011)
Advance warning as a special service for those who take the time to read the discussion - the next question in this series (scheduled to go live in about a week) will involve some heavy arithmetic!
Oh joy!
Paul White
SQL Server MVP
SQLblog.com
@SQL_Kiwi
Post #1202713
« Prev Topic
|
Next Topic »
40 posts, Page 1 of 4
1
2
3
4
»
»»
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.
