Table Columns Storage

Jul 20, 2005

Hi ,

This is related to datawarehouse , data mining . We are told that data
mining tools such as spss or sas , need a large table which has lots
of columns inside . Based on our project , out final table which will
be used in data mining , has lots of computed values . The final
number of columns of the table is 7800!(lots of calculated values)
First of all , i dont see the reason of this requirement of the data
mining tools. I will be appreciated if someone can clarify this: Why
does a data mining tool need such a large table?

The main issue is if i create table with 7800 columns inside ( in fact
oracle only allows to create table with 1000 columns) , i believe it
cant be queried.
My basic calculation shows that the average row size of this table
will be 160kb. , considering my db_block_size of 16kb. this means 10
blocks for 1 row. (The table will have more than 10.000.000 rows) No
matter how fast my disk subsystem is , i think the queries against
this table will fail. So what can i do? May be I need a different
type of storage technique for instance column based storage ( i heard
that sysbase has this feature , dont know the details / purpose..)
How can i solve such a problem? The database server really does not
matter , it can be oracle,sqlserver , sybase,informix , etc... I will
be appreciated if someone can help me abut the issue.

Kind Regards,
hope

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Reducing Storage Space By Moving Rarely Required Columns To Separate Table While Sharing Primary Key Constraint

Aug 17, 2006

Dear all,

In my current database design, there is one table (PState) which has a Primary Key (int) and a few other fields.

During development, a pattern started to arise; for certain rows in PState, I wanted to specify an additional set of columns (over 10 of them with quite large lengths) for each row in PState. However, as these additional columns would only be required in approximately 20% of the rows of PState, there would be plenty of NULL values in PState if I would make this table wider than necessary. So, I decided to create a separate table with those optional columns (PStateWFI). In order to attach these additional columns in PStateWFI to PState in the cases they were needed, I would obviously have to create a Foreign Key constraint on the Primary Key of PStateWFI so that these optional rows would know which row in PState they would belong to.

However, the problem with this approach is that one could define multiple rows in PStateWFI referring to the same row in PState, which would not make sense. Thus, a UNIQUE index constraint added to the constrained ID column in PStateWFI would make sense to ensure that there could only be one set of optional columns added to each row in PState. But now, when adding the UNIQUE index, the FK constraint started to appear as a bidirectional key link in the Diagram; hence, new entries in PState would have to meet a FK constraint based on PStateWFI, which was not intended.

Hence, I had to create a quite awkward design to enforce the constraints:

1. The PState table has a Primary Key (PState.ParticleID, int, Identity Specification: Yes)
2. The PStateWFI table has a Primary Key (PstateWFIID, int, Identity Specification: Yes)
3. PStateWFI has field "PStateID" which has a FK constraint to PState.ParticleID (which is a one-way constraint operating in the correct way and does not constrain insertions in PState)
4. PStateWFI has an additional column ParticleIDIndex which has a UNIQUE Index attached to it.
5. There is a check constraint on PStateWFI enforcing PStateWFI.ParticleIDIndex = PStateWFI.ParticleID.

Although this structure does the job, it makes it necessary to add a redundant column in PStateWFI by duplicating the PStateWFI.ParticleID into PStateWFI.ParticleIDIndex, since I can't create a UNIQUE index on PStateWFI.ParticleID without constraining the PState table as well. So, insertions into this table would have to insert the same value into two columns. Not a big deal, but appears slightly ugly.

Basically I'd hope someone could explain why a bidirectional FK constraint has to be enforced on the primary key table in a relationship when the constrained column in the primary key table has a UNIQUE index attached on it. I have a few other cases where the above approach would benefit from a more clear structure.

Thanks in advance for any advice.

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Hi,

This question comes without the wish for any philosofical debates concerning NULL



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Thnx, Jeroen.

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hello forum friends,

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**TABLE_ONE**
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-----------------------------------------
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Bird Chicken 1
Reptile Snake 1
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-------------------------
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Test_1 1
Test_1 1
Test_1 1
Test_2 2
Test_2 2
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I am trying to create a table such as shown below:

Test_Name Bird Reptile Mammal Fish
-----------------------------------------------------------------
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Test_2 Crow Cow
Test_3 Ostrich

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For e.g

Select
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Table_Bird.Animal AS 'Birds',
Table_Mammal.Animal AS 'Mammal',
Table_Reptile.Animal AS 'Reptile,
Table_Fish.Animal AS 'Fish'
From Table_One

[Code] .....

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Hello,



I am building partitiong tables, partitioning on different file groups:



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Partitioned table referred to old data that are not frequent accessed for reporting can be stored on separate location(External storage, tape and so on) or to make partitioning functioning must all file groups must be presents?



If not, how can I separate old data from current ones (still using partitioning) to reduce the size of DB?



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Thank

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Jan 14, 2008

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Part of our product is 32 bit (console) and another part is x64 (server).
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REGSAM samMask = KEY_ALL_ACCESS;
if ( regIsWow64Process () ) samMask = samMask | KEY_WOW64_64KEY;
lStatus = RegCreateKeyEx( hLocalConnectKeyRoot,
szSubkey,
0L,
NULL,
REG_OPTION_NON_VOLATILE,
samMask,
NULL,
hKey,
&dw ) ;
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We have tried four versions of our TSMS spanning many changes but the install acts the same.
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Do you have any suggestions on how to tackle this problem?
I have full installation traces but can only see that the registry work is being refused. I can't see why.

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winniemax

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Sep 19, 2007



Hi,

I have two tables

Table Source
{

category varchar(20),
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}



Table Destination
{


SubjectId varchar(20),
SubjectDate datetime,
category varchar(20),
LastUpdate datetime
}

Please note that the number columns are different in each table.
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Is there anyway to bulk insert into these columns.


Your quick response will be appreciated

~Mohan Babu

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1. First question: How do I modify my current query (see below) so that for each row in my table i got back one row with 19 columns.

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FROM PRODUCT A
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FROM PRODUCT A
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I am using Microsoft SQL Server 2008 R2 version. Windows 7 desktop.

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Thanks,

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