Adding Fields to a large table

Dear all
I implemented a datawarehouse for a midsized retail company on SQL Server
2005. One of their facttables is a daily stock snapshot with about 50
millions of records.
Business now want to create a new report. This report requires several
calculated values. The requirement says this values should be stored in the
warehouse.
Here is my question: When I add 3 more decimal fields (18,9) to this stock
table - how does this affect the size of the record/table when they have NULL
values or a value?
Thanks in advance for your help,
Regards,
Marc
Marc,
They will take up 9 bytes each regardless of whether or not they are null.
-- Bill
"Marc" <Roger_Rombooth@.community.nospam> wrote in message
news:CB83237B-BDE4-467F-8C4B-AD9C88D972B5@.microsoft.com...
> Dear all
> I implemented a datawarehouse for a midsized retail company on SQL Server
> 2005. One of their facttables is a daily stock snapshot with about 50
> millions of records.
> Business now want to create a new report. This report requires several
> calculated values. The requirement says this values should be stored in
> the
> warehouse.
> Here is my question: When I add 3 more decimal fields (18,9) to this stock
> table - how does this affect the size of the record/table when they have
> NULL
> values or a value?
> Thanks in advance for your help,
> Regards,
> Marc
>
|||Hello Marc,
As Bill mentioned, fixed length data will take up the bytes no matter it is
Null or not. Also, in SQL Server 2000, a NULL bitmap is always present,
even if no NULLs are allowed in any column. You may want to refer to the
following link for more details:
Poking about with DBCC PAGE (Part 1 of ?)
https://blogs.msdn.com/sqlserverstorageengine/archive/2006/08/09/692806.aspx
If you have any further questions or comments, please feel free to let's
know. Thank you!
Best Regards,
Peter Yang
MCSE2000/2003, MCSA, MCDBA
Microsoft Online Community Support
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|||Thanks Bill and Peter!
Best Regards,
Marc