Float Storage And Usage
Jun 7, 2007
Greetings.
I need to convert some columns of type numeric(12, 0) to hold floating point
information scale and precision I can't determine in advance (customer data
can vary wildly) so I wanted to use the datatype that offers the maximum scale
and precision..
I'm targeting sql server 2005 systems (not 2000).
It seems my choices are real and float, and the docs seem to indicate that
float offers with widest ranges.
I'm trying out using the 'float' for the new data type as the default
precision is said to be 53.. Does this mean the total number of digits is up
to 53?
I don't know if there is anything else I need to take into account since these
two columns are part of a primary key, and I supposed, therefore, are indexed.
thanks
Jeff Kish
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Sep 4, 2006
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Oct 27, 2014
How to implement distinct storage tiers on SQL Remote BLOB Storage (RBS)?
I want to use this SQL Feature to move files(images, videos, pdf files) from a database to a distinct database dedicated to RBS. Then I want to have several storage tiers, where objects will be saved and moved according access frequency. Old data will be arquived in cheap storage, but it must be always accessible if needed.
Description:
- 1st and main tier: new and frequently accessed objects stored in high performance storage;
- 2nd tier: automatically move older or less accessed objects to an inexpensive and different storage tier;
- in all cases, all objects must be accessible to all users, but accessing to archived objects(2nd tier) will be much slower;
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Apr 9, 2007
I can't take full credit for this. I want to share this with Jeff Moden who did the important research for this calculation here.
All I did was just adapting some old code according to the mantissa finding Jeff made and optimized it a little
Some test codeDECLARE@SomeNumber FLOAT,
@BinFloat BINARY(8)
SELECT@SomeNumber = -185.6125,
@BinFloat = CAST(@SomeNumber AS BINARY(8))
SELECT@SomeNumber AS [Original],
CAST(@SomeNumber AS BINARY(8)) AS [Binary],
dbo.fnBinaryFloat2Float(CAST(@SomeNumber AS BINARY(8))) AS [Converted],
@SomeNumber - dbo.fnBinaryFloat2Float(CAST(@SomeNumber AS BINARY(8))) AS [Error]
And here is the code for the function.CREATE FUNCTION dbo.fnBinaryFloat2Float
(
@BinaryFloat BINARY(8)
)
RETURNS FLOAT
AS
BEGIN
DECLARE@Part TINYINT,
@PartValue TINYINT,
@Mask TINYINT,
@Mantissa FLOAT,
@Exponent SMALLINT,
@Bit TINYINT,
@Ln2 FLOAT,
@BigValue BIGINT
SELECT@Part = 1,
@Mantissa = 1,
@Bit = 1,
@Ln2 = LOG(2),
@BigValue = CAST(@BinaryFloat AS BIGINT),
@Exponent = (@BigValue & 0x7ff0000000000000) / EXP(52 * @Ln2)
WHILE @Part <= 8
BEGIN
SELECT@Part = @Part + 1,
@PartValue = CAST(SUBSTRING(@BinaryFloat, @Part, 1) AS TINYINT),
@Mask =CASE WHEN @Part = 2 THEN 8 ELSE 128 END
WHILE @Mask > 0
BEGIN
IF @PartValue & @Mask > 0
SET @Mantissa = @Mantissa + EXP(-@Bit * @Ln2)
SELECT@Bit = @Bit + 1,
@Mask = @Mask / 2
END
END
RETURNSIGN(@BigValue) * @Mantissa * POWER(CAST(2 AS FLOAT), @Exponent - 1023)
END
Thanks again Jeff!
Peter Larsson
Helsingborg, Sweden
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Jan 14, 2008
I am a Windows developer for the IBM Tivoli Storage Manager Server (TSMS) product.
Our product installation is built with InstallShield and uses the Windows Installer.
On a new installation of Windows 2003 x64 Storage Server R2, at a customer's site, the TSMS product fails to install.
The install of the OS has version 3.01.400.3959 of the Windows Installer and I see no newer version that installs.
Part of our product is 32 bit (console) and another part is x64 (server).
When installing I can see that the install's default is being redirected/reset to C:Program Files (x86)TivoliTSM after it is explicitly set by a custom action to ..Program Files.. . I further observe that our custom actions to write 64 bit registry entries are being refused.
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 ) ;
The above fails to create the key.
We have tried four versions of our TSMS spanning many changes but the install acts the same.
This does not happen on any other Windows OS we test on but we do not test on Windows 2003 Storage Server R2 being that it is an OEM product. We did test on Windows server 2003 R2 x64 and do not see this problem.
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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Nov 2, 2007
I have a client program that writes to sql server database 10 records per second . i want to compute the CPU usage and the memory usage for the whole program or CPU usage,memory usage for the insert statement in the program .
Can anybody help me with this?
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Sep 7, 2007
Hello, When I am seeing SQL Server 2005 Management studio Server Dashboard> I am seeing my(USERS) databases and msdb database usage is very small % of in CPU Usage(%), Logical IO Performed (%) Usage pie chart.
90% of Total cpu usage is showing for Adhoc Queries. what excatly this means in Dashboard? if application uses more than it would have shown in Database level or not?
sicerely this dashboard is good, if any one is watching daily, please advice their experiences here.
Thanks in advance. Hail SQL Server!
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Jan 30, 2014
providing a query for fetching the data for CPU Usage, Memory usage, blocking and all details ...
I want to create a job which will run on a Node every 15 min and store data in a table for each instance...
DMV is not giving more stuff and xtended events not sure if i can store that data into a table?
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Feb 18, 2004
Does it make a difference if I use the Float or Int data type for a field such as ReceiptNumber or CheckNumber?
Thanks for any thoughts,
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Feb 20, 2000
Hi!
I'm quite new to SQL Server. I need to set a float datatype to display something like 3.55. However, all values that are stored in the float column are truncated to 4 or some other single digit. How can this be prevented?
Regards,
Sam
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Sep 5, 2002
Hello everyone,
I am sure this is a newbie question as I am new to Microsoft SQL server but any help is greatly appreciated. I am populating a SQL database from an AS400. The decimal numbers from the AS400 are coming accross with extra decimals. (ie. 63.02 is coming accross as 63.0200001)
Is there a way to limit the number of decimals in a float or real field - or a SQL command I can put in a script to truncate each field to 2 decimal places after they are populated.
Thanks,
Randy
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Jun 29, 1998
We are having problems with rounding errors on large monetary calculations in sql server 6.5
The calculations include float fields (for volumes and unit of measure conversions in product movements). I was wondering if the float being "approximate" could be the problem.
IF it is, why would I want to store things as a float instead of a dec(28,14)?
Is it faster to compute numbers stored as approximate binaries? Will we see a big performance hit if we switch some of the table`s field`s to decimals?
Thanks in advance.
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Jun 21, 2007
Hi,
why does converting integer to float take so long? Its a column with about 5 Million rows.
I want to avoid cast(inumber1 as float) / cast(inmuber2 as float), thats why converting them. Queries should be a bit faster after that.. hope so :)
Thanks a lot
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Aug 30, 2007
I have some engineering data in my table and the db designer is representing it with a float datatype. Here's what is happening. If I query on a record based on id num and get a row and put it in text boxes in my Windows App, min_riv_hd_dia (the float) is 0.026<14 zeroes>2. If I try to query and get that same record again but this time based on id num and min_riv_hd_dia equal to 0.026<14 zeroes>2, I get no row found. If I just do a select on this row based on id number, sql server displays it as 0.026. But if I query with 0.026 as my value, still the row is not found. If I query min_riv_hd_dia > 0.026, the record is found.
So my question is, how can I tell the exact value that must be input in my search criteria in order to find this row?
Thank you so much if you can help!
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Dec 29, 2003
Hi there
I have two Databases
in both databases are fields with float - no null
If I am transfering data from one database to the other everything works well unless there is a comma in the field ( 0,99 or 123,456 )
"SQLAString = "Insert into InventurDaten (Artikelnummer,Hauptartikelnummer,Auspraegung,Arti kelbezeichnung,Artikeltext1,EDVEingang ,EDVAusgang,InventurmengeEDV) values ('" & ArtNr & "','" & ArtNrT & "','" & AP & "','" & ArtBez & "','" & ArtText & "'," & EDVEingang & "," & EDVAusgang & "," & ArtMenge & ")"
"
where EDVEingang and EDVAusgang are defined as float, no null
Then the programm stops with the following message:
Within the INSERT-Procedure there are less columns then there are Contents in the Value-Clause.
I have to finish the programm until tomorrow morning and don't know what the problem is.
If anybody has an idea, please let me know.
regards
Reiner
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May 4, 2004
When should I choose decimal over float and vice versa?
Mike B
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Apr 10, 2008
Hi Everyone,
here is a simple SP
Create procedure test
@input float
as
Begin
return @input
ENd
If I execute the following
declare @output float
exec @output=test 1.12121
select @output
why I got 1 not 1.12121?
any idea? How to get the correct result?
Thank you in advance
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Apr 3, 2006
Hi!How do I do to make t-sql not rounding the result that i returned?For example:0.9616458*60 = 57,698748 (in any calculator)while following:--------------------------------declare @a floatdeclare @b intset @a=0.9616458set @b=60print @a*@b---------------------------------will show :57.6987How do I do to make MSSQL to show me the value whothout rounding it?Thanks!
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Nov 22, 2006
select convert(float,'1.2334e+006')1233400.0select convert(decimal(20,2),'1.2334e+006')Server: Msg 8114, Level 16, State 5, Line 1Error converting data type varchar to numeric.Is there any way around?Is there any set options? I tried arithabort or arithignore and theydon't work.Thanks.
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Jul 20, 2005
HI,I WANT THIS TO PRODUCE EXACT RESULT. (IN SQL SERVER)SELECT (23 / 233) * 100THE ANSWER SHOULD COME 9.871244635 OR 9.87BUT IT RETURNS 0.I WANT THE PERCENTAGE.HOW TO HANDLE THIS KIND OF PROBLEM.IS THERE ANY SET COMMAND FOR IT?THANKST.S.NEGIJoin Bytes!
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Jul 20, 2005
Hi,Just wonder whyPRINT CAST(0.0573542567654 AS float)will give the rounded reult0.0573543rather than the original number?"float" should be 'big' enough to hold numbers that have even moredecimal places. How come it round up at the 7 decimal place?since I need to do some calculations with accumulated values. Therounded figure will cause significant error after a number of opertions.Are there any way to work around it?thanks*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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Mar 20, 2008
I had database with "-1.#IND" (Indefinite /infinite) values in float columns.
Is there anyway I can insert -1#IND value into float column using some insert query and query analyzer? I am using SQL Server 2000.
I want to insert this value to replicate the issue..just for testing. I am also wondring how my database got these values.
Thanks in Advance!
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Nov 20, 2007
I am keep getting an arithmetic overflow converting float to type numeric when running a script that looks something like this.
insert into table1
(
column1
)
select
column2
from source server.
column1 is a numeric (28,8) and column2 is float.
there are about 2000000 records in column2, and I know that when I tried just copying the top 1000000 wasn't a problem.
does anyone know what could be causing this problem???
*it's not because the data in column2 is out of range.
thank you
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Mar 20, 2008
I had database with "-1.#IND" (Indefinite /infinite) values in float columns.
Is there anyway I can insert -1#IND value into float column using some insert query and query analyzer? I am using SQL Server 2000.
I want to insert this value to replicate the issue..just for testing.I am wondring how my database got these values.
Thanks in Advance!
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Dec 23, 2003
Hello Everyone and thanks for your help in advance. I am developing a document storage application for an intranet that will store various Word, Excel, and PDF documents. Most of the examples I see utilize SQL Server and an image field rather than the FileSystem Object to store documents. My concern with this method is that some of the documents may be several hundred pages (not exactly sure of the actual file size yet, but they must be fairly large). My question is, where does the use of SQL Server become impractical for this type of application? Any insight would be greatly appreciated. Thanks.
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Feb 20, 2002
Hello,
Does anyone know the upper limit of data size that one SQL 2K table can hold. I've seen 50GB tables in some warehousing servers, but what is the true limit. Soes the limit vary with the SQL2k version?
Thanks!
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Jun 7, 2004
I have an MSDE installation on Windows server 2003. It looks like the C: drive is taking the brunt of the data when I load up the database. I would like to specify a different drive for data...Is there a way to do this?
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Feb 21, 2005
How should i know size of the table in the DB. suppose my DB has 5 tables and the size of the DB is 500 MB. How can I know size of the indivdual table.
Thanks.
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Feb 28, 2006
greetings!!!
Help me please!
I'm migrating a images DB of a system
I know the structure of the data tables and all type of data in it
How can I learn about the STORAGE of IMAGES? In sql Server
Where can I found information about that?
I need to know something about that topic
usually, whats the way for image’s storage ?
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May 30, 2006
Hi guys.
I am currently developing a system thats stores exchange stats in a db. Since our customers are companies with 20 employees up to 5 000 there a a big difference in the volume of data needed to be stored.
We currently thinking of supplying a SQL Server Express DB to the small customers and suggest a SQL Server to the bigger.
But since I would like to use the same structure for both types of customers I wonder how should i design the storeage.
Since the could be from 500 records a day up to 20 000. There are quite simple recordes with only simple datatypes. about 15 fields with no more than 10 chars each, mostly 2.
Should i separate the data in diffrent tables for a week or a day etc.
Since I am only going to filter data on 1 or 2 fields the data will be easly indexed.
The reports generated will almost always only use 1-3 months of data, but historical reports have to be possible.
My question are ofcourse:
Whats the best solution for me?
Thanks in advance:)
/Johan Wendelstam
Sweden
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Jun 2, 2006
In MSQL Server 2000 how can I expand or use multiple transaction logs because the hard disk i am using windows dont have more than 4 GB free and the query i want to run overcomes this space.
I have another one HDD with 20-30 GB free space and i want to use this disk so to use a second transaction log or move this log to this disk.
Can this be happen and how ????
Thank you in advance
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Feb 23, 2007
additional to data, what other type of information can be store in sql databases, i need to store pictures and mp3's that can be done, if not do you know what storage can be used for this purpose?
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Jun 19, 2007
I have recently designed and built my first database using SQL server 2005 express. I have included an image (BLOB) column in one of the database tables. This is a bad idea according to some experts, and some say it is OK!
I am currently carrying out a trial with just 3 pictures via Visual Basic 2005 express forms, and there is no problem so far as the images are displayed for each record. But I anticipate between 300 - 1000 images for the table, and this could pose real problems for SQL server 2005 express and Visual Basic 2005 express, I guess.
I have just been reading that the cost of storing large images in the database is too high! I have also read it's better to store images (BLOB) into the file system because it is cheaper to store them no matter how many there are.
But the question is how I can reference an image in this path: C:PictureProductGrocery 0052745.jpg in the database table, so that when I select a record Visual Basic 2005 forms the image is displayed accordingly, similar as when stored directly in the database table? Your help very much appreciated.
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