SQL Server 2008 :: What Is The Use Of Checksum
Feb 11, 2015what is the use of check sum in sql server:
ex: RESTORE DATABASE [XXX] FROM DISK = 'XX.BAK' with check sum
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SQL Server 2008 :: Perform Checksum Based On The Source Table Data?
Aug 10, 2015I'm trying to load data from old SQL server 2000 to new SQL server 2014. I need to do a checksum to check if all the source data is loaded in the target database(SQL server 2014). I've created the insert statement for the same which works. I need to use checksum to make sure all the source rows are loaded in the target table. I haven't done checksum before.
Here is my insert statement:
INSERT INTO [Test].[dbo].[Order_tab]
([rec_id]
,[date_loaded]
,[Name1]
,[Name2]
,[Address1]
,[Address2]
[code]....
Checksum Task Vs T-sql Checksum
Feb 29, 2008do you have to store the checksum from the task in order to verify change? Here is what I did and it seems it's not going to work
Lookup transformation that
selects matching fields and returns a t-sql with the binary_checksum(fields)
Checksum transformation returns the checksum of same inbound fields
conditional split passes on changed records to the update
getting all the records everytime and should not be happening.
is there a way to make this work or do I have to store the checksum
Checksum
Jun 11, 2008Hi
What is the purpose of checksum function???
RKNAIR
Binary Checksum
Feb 6, 2004Hi,
Can anyone provide me with the syntax for comparing rows of two tables using binary checksum? The tables A and B have 8 & 9 columns respectively. The PK in both cases is Col1 & Col2. I want checksum on Columns 1 to 8.
Thanks
Checksum Computation Help
Feb 6, 2004Please execute the script below to understand the problem -
---
create table test(id int, col1 int,col2 varchar(5),col3 datetime)
create table test2(id int, col1 int,col2 varchar(5),col3 datetime)
--id & col1 make up the PK.
insert test values(4,4,'d','02/06/2004')
insert test values(4,4,'e','02/06/2004')
insert test2 values(4,4,'d','02/06/2004')
insert test2 values(4,4,'e','02/06/2004')
select *
from test
select *
from test2
--The rows are identical.
--Script A
select t.*
from test t
join test2 t2 on t2.id=t.id
where CHECKSUM(t.col2,t.col3)<>CHECKSUM(t2.col2,t2.col3)
--The purpose of the above script is to check for any updates in the two tables. It returns two rows. But as you can see both these rows were present in the table before. So I modify the script to -
--SCRIPT B
select t.*
from test t
join test2 t2 on t2.col2=t.col2
where CHECKSUM(t.col3)<>CHECKSUM(t2.col3)
-- In this case no row is returned.This is exactly what I need. The problem - Now execute the script below.
TRUNCATE TABLE TEST
TRUNCATE TABLE TEST2
insert test values(4,4,'d','02/06/2004')
insert test values(4,4,'d','02/01/2004')
insert test2 values(4,4,'d','02/06/2004')
insert test2 values(4,4,'d','02/01/2004')
--Now when I execute script B two rows are returned which is not what I want. Since the rows are identical no row should be returned. So depending on what column changes (col2 or col3), I have to alter the script. I seek advise on the method to calculate checksum. Again the PK is ID and Col1 only.
Thanks
drop table test
drop table test2
go
--
CHECKSUM Function
Jun 7, 2006Hello All,
How to use CHECKSUM function and how it is useful?
Thanks
Sanjeev
Checksum Not Working
Jul 23, 2005I'm developing a stored procedure to run an update based on valuesentered into a .Net web form. I want to capture the chceksum of therow when it is displayed on the form then validate that when the updateis exec'd. Simple enough logic, eh? The problem is when I try to usethe checksum(*) function, SQL server yells at me and says that it isn'trecognized. I'm using SQL Server 7, so wtf? I am not the admin of theserver and I'm skirting around SQL Server Enterprise Manager and usingany free utils, MS Access, and Visual Studio to maintain this db.ThanksAlex Jamrozek
View 7 Replies View RelatedWhat Do You Think About The Checksum Function ?
May 29, 2007Hi,I'd like advices about an idea I add to resolve a problem. thanks toyou in advance for yours answers.I have a database with tables that I load with flat file. The size ofeach table is 600 Mb. The flat file are the image of an applicationand there is no updated date or created date on any table. So mytables are just a copy of the data from the flat file.Now I'd like to create an History Table. So I have to determine whichlines changed and which one did'nt.As I don't have any date on my row the only answer I had unil know wasto check each column on each row to see if any data changed. If thedata changed I add a new line in my history date.My idea is to add a checksum column in both table on all columns. Toknow if any data change I just have to check my PK + my checksumcolumn.Do you think that is a good idea ? Is checksum a quick function ornot ?.Thanks.--K
View 3 Replies View RelatedPage Checksum
Jan 24, 2008Hi,
I heard that page checksum enabled will reports errors occured in the log. That's good.
Currently we have DBCC PHYSICAL_ONLY run alone and CHECKTABLE on group of tables on different days. A suggestion came from a person is to turn off 'DBCC CHECK TABLE' and run only when checksum reports an error and continue running CHECKDB WITH PHYSICAL_ONLY as before.
Is this suggestion a best practice? Please also write few lines to say why it is wrong or wright.
Thanks and best regards
Priw
CHECKSUM && CHECKSUM_AGG In T-SQL
Sep 24, 2007Hi,
I recently researched on the CHECKSUM & CHECKSUM_AGG functions in T-Sql and found them really useful. However, I was skeptical that there are chances of these functions returning the same values for non-identical inputs. I just got on to the forums and found more than one unhappy folks writing about their experience with these functions.
I am designing a large database (warehouse) and found these functions tempting to implement for the sake of
using CHECKSUM for
- indexing long character fields
- multiple colums of the same table that would involve in a join and use the new checksum field instead
using CHECKSUM_AGG for
- I bulkcopy flat file soruce data into a character field of a table and to ensure that I am not loading the same file multiple times, I plan to use CHECKSUM_AGG( CHECKSUM( [FlatFileRecord] ) ) and verify that no two loads have the same output.
Can some body suggest if I can trust these methods for my purpose?
Many thanks in advance!!
Thanks,
Harish
Checksum Storage
Feb 18, 2008it sounds like a column can be added to each row in a table that is the checksum or binary_checksum of an expression. How many bytes do each of these occupy? Does the answer depend on the number and/or length of items in the expression?
View 4 Replies View RelatedHELP NEEDED FOR CHECKSUM
Dec 18, 2007Hi:
i am using checksum in my etl process for this i have a checksum field to calculate the values in my table
the column is a computed column and it has a property for persistence .
what decision should i take should i make it persisted ot not what is the industry standard.
Can you please expalin how this property would affect the behaviour of the column
will this property affect me in any thing like indexes . please let me what step should i take should i make the column persisted or not .
Please let me know.
Thanks,
Need Help With Checksum Procedure
May 11, 2006Morning Campers,
I have two tables src_monthly_terrrier and src_weekly_terrier. Both of these tables consists of 10+ columns. As the table names probably suggest, I import weekly data into one and monthly data into another.
All the source data comes from an Excel spreadsheet via straight Import Data procedure. The only guaranteed change on a weekly and monthly basis is that one of the columns in each table named src_date will obviously have the data value for whichever month or week's data it relates to.
I understand that through 'SQL Server Business Intelligence Development Studio' I can create an 'Intergrated Services' package that will import the spreadsheet details for me. I might be going the long way around this, but it was my intention to bring in all the data and then run a couple of 'INSERT INTO' Stored Procedures.
My biggest issue / vunerability I have is that there is no error checking of the data on the way in to ensure that it has not already been imported. What I was thinking I could do to resolve this was to create a Checksum field comprising of a number of different columns (incl src_date) and then somehow write something that will look at the values of each intended imported row and then work out whether a duplicate checksum was found in the target table and then rejected the import routine as Duplicate Data Found (or something similar) and move onto the next stored procedure.
My problem is two fold, one I have no idea how to create said checksum and two no idea where to begin on coding a procedure etc that looks to see if the value already exists etc etc.
I have looked up checksum creation on the net and there appears to be plenty of resource to explain how to create one, so I guess my main question is, Where do I start when it comes to writing some code that will do the check of the checksum before the importation routine begins (or at least the Insert Into procedures.
I would truly appreciate anyone's help on this. In the meanwhile I am off to learn how to create them.
I would like to add, if anyone sees this as a bad idea, then please speak up.
Thanks in Advance
CHECKSUM() Of Binary Data
Mar 19, 2004Hello,
I need to generate HASH of text values for my app. I can generate hash values for normal fields using CHEKCSUM and BINARY_CHECKSUM function but it does not support checksum of text, ntext, image, and cursor, as well as sql_variant.
How can I generate checksums of such datatype.
Karam
Checksum Vs Torn Page
Aug 13, 2007How much of a performance impact will using Cheksum have over Torn Page Detection for Page Verify Recovery? Thanks
View 3 Replies View RelatedBackup With CHECKSUM Operation...
Mar 13, 2007Looking for some clarification on the CHECKSUM option of the BACKUP command.
If the the CHECKSUM option is specified in the backup, will the backup fail if CHECKSUM finds bad values (or at least raise an error)? Or, is it only reported when doing a RESTORE VERIFYONLY?
Thank you.
CHECKSUM Replacement For IMAGE And TEXT
Aug 22, 2006With this discussion here http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=70328
I started to thinkn about Microsoft really calculated checksum value.
This code is 100% compatible with MS original. That is, the result is identical.
You can use it "as is", or you can use it to see that MS function does not produce that unique values one could expect.
With text/varchar/image data, call with SELECT BINARY_CHECKSUM('abcdefghijklmnop'), dbo.fnPesoBinaryChecksum('abcdefghijklmnop')
With integer data, call with SELECT BINARY_CHECKSUM(123), dbo.fnPesoBinaryChecksum(CAST(123 AS VARBINARY))
I haven't figured out how to calculate checksum for integers greater than 255 yet.CREATE FUNCTION dbo.fnPesoBinaryChecksum
(
@Data IMAGE
)
RETURNS INT
AS
BEGIN
DECLARE@Index INT,
@MaxIndex INT,
@SUM BIGINT,
@Overflow TINYINT
SELECT@Index = 1,
@MaxIndex = DATALENGTH(@Data),
@SUM = 0
WHILE @Index <= @MaxIndex
SELECT@SUM = (16 * @SUM) ^ SUBSTRING(@Data, @Index, 1),
@Overflow = @SUM / 4294967296,
@SUM = @SUM - @Overflow * 4294967296,
@SUM = @SUM ^ @Overflow,
@Index = @Index + 1
IF @SUM > 2147483647
SELECT @SUM = @SUM - 4294967296
RETURN @SUM
ENDActually this is an improvement of MS function, since it accepts TEXT and IMAGE data.CREATE FUNCTION dbo.fnPesoTextChecksum
(
@Data TEXT
)
RETURNS INT
AS
BEGIN
DECLARE@Index INT,
@MaxIndex INT,
@SUM BIGINT,
@Overflow TINYINT
SELECT@Index = 1,
@MaxIndex = DATALENGTH(@Data),
@SUM = 0
WHILE @Index <= @MaxIndex
SELECT@SUM = (16 * @SUM) ^ ASCII(SUBSTRING(@Data, @Index, 1)),
@Overflow = @SUM / 4294967296,
@SUM = @SUM - @Overflow * 4294967296,
@SUM = @SUM ^ @Overflow,
@Index = @Index + 1
IF @SUM > 2147483647
SELECT @SUM = @SUM - 4294967296
RETURN @SUM
END
Peter Larsson
Helsingborg, Sweden
CHECKSUM , Produces Same Hash For Two Different Inputs. Is This Right?
Jul 25, 2007Hi,
We are using binary_checksum in some of instead of update trigger. The problem came into the knowledge when update falied without raising any error. We came to know after research that checksum returns same number for two different inputs and thats why update failed.
We are using following type of inside the trigger.
UPDATE [dbo].[Hospital]
SET
[HospitalID]= I.[HospitalID],
[Name]= I.[Name],
[HospitalNumber]= I.[HospitalNumber],
[ServerName] = I.[ServerName],
[IsAuthorized]= I.[IsAuthorized],
[IsAlertEnabled]= I.[IsAlertEnabled],
[AlertStartDate]= I.[AlertStartDate],
[AlertEndDate]= I.[AlertEndDate],
[IsTraining]= I.[IsTraining],
[TestMessageInterval]= I.[TestMessageInterval],
[DelayAlertTime]= I.[DelayAlertTime],
[IsDelayMessageAlert]= I.[IsDelayMessageAlert],
[IsTestMessageAlert]= I.[IsTestMessageAlert],
[IsUnAuthorizedMessageAlert]= I.[IsUnAuthorizedMessageAlert],
[IsWANDownAlert]= I.[IsWANDownAlert],
[IsWANUpAlert]= I.[IsWANUpAlert],
[CreateUserID]= Hospital.[CreateUserID],
[CreateWorkstationID]= Hospital.[CreateWorkstationID],
[CreateDate]= Hospital.[CreateDate] ,
/* record created date is never updated */
[ChangeUserID]= suser_name(),
[ChangeWorkstationID]= host_name(),
[ChangeDate]= getdate() ,
/* Updating the record modified field to now */
[CTSServerID]= I.[CTSServerID]
FROM inserted i
WHERE
i.[HospitalID]= Hospital.[HospitalID]
AND binary_checksum(
Hospital.[HospitalID],
Hospital.[Name],
Hospital.[HospitalNumber],
Hospital.[ServerName],
Hospital.[IsAuthorized],
Hospital.[IsAlertEnabled],
Hospital.[AlertStartDate],
Hospital.[AlertEndDate],
Hospital.[IsTraining],
Hospital.[TestMessageInterval],
Hospital.[DelayAlertTime],
Hospital.[IsDelayMessageAlert],
Hospital.[IsTestMessageAlert],
Hospital.[IsUnAuthorizedMessageAlert],
Hospital.[IsWANDownAlert],
Hospital.[IsWANUpAlert]) !=
binary_checksum(
I.[HospitalID],
I.[Name],
I.[HospitalNumber],
I.[ServerName],
I.[IsAuthorized],
I.[IsAlertEnabled],
I.[AlertStartDate],
I.[AlertEndDate],
I.[IsTraining],
I.[TestMessageInterval],
I.[DelayAlertTime],
I.[IsDelayMessageAlert],
I.[IsTestMessageAlert],
I.[IsUnAuthorizedMessageAlert],
I.[IsWANDownAlert],
I.[IsWANUpAlert]) ;
Here is the checksum example which produces same results for two different input.
DECLARE @V1 VARCHAR(10)
DECLARE @V2 VARCHAR(10)
SELECT @V1 = NULL, @V2=NULL
SELECT binary_checksum('KKK','San Jose','1418','1418SVR ',0,1,@V1,@V2,0,30,180,1,0,1,1,1),
binary_checksum('KKK','San Jose','1418','1418SVR ',1,1,@V1,@V2,0,30,180,1,1,1,1,1)
Lookat the two binary_checksum above, they are different and should not match, but they both return same value.
Can someone please provide some info on these.
SQLIS Checksum Install Problems
Mar 22, 2007For detecting delta records, I'm a big fan of SQLIS' checksum transform. I'm having difficulty in it's install on my current machine, however. After the installation and the new transform is added to my DataFlow toolbox... I can't open the UI for the transform to define the checksum. Instead, I get the following error:
===================================
Could not load file or assembly 'Microsoft.ExceptionMessageBox, Version=9.0.242.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The system cannot find the file specified. (Microsoft Visual Studio)
------------------------------
Program Location:
at Konesans.Dts.Pipeline.ChecksumTransform.ChecksumTransformUI.Edit(IWin32Window parentWindow, Variables variables, Connections connections)
at Microsoft.DataTransformationServices.Design.DtsComponentDesigner.StartComponentUI(Boolean startGenericUI)
Anyone have any suggestions? Thanks in advance.
Checksum Transformation Is Not Detecting My Change
Jul 20, 2007I am using the Konesans Checksum transformation ( http://www.sqlis.com/21.aspx ) to detect changes in my big (many columns, type 2 SCD) dimensional table.
But I am running into collossions
The checksum transformation, sometimes misses a small change in the record, for instance when a certain flag is set or unset. Is there a more robust checksum generator? Of any other suggestions on to solve this?
thx
PAGE_VERIFY Setting CHECKSUM - How To Detect?
Aug 30, 2006
Does anyone know how to detect the CHECKSUM setting of the PAGE_VERIFY database option (2005 only)?
BOL (ALTER DATABASE) includes the following statement:
PAGE_VERIFY { CHECKSUM | TORN_PAGE_DETECTION | NONE }
The current setting of this option can be determined by examining the page_verify_option column in the sys.databases catalog view or the IsTornPageDetectionEnabled property of the DATABASEPROPERTYEX function.
However, there is no column named page_verify_option in the view sys.databases, and DATABASEPROPERTYEX('IsTornPageDetectionEnabled') does not discriminate between the settings CHECKSUM and NONE (it returns 0 for both)!
Can I Run SQL Server 2008 - Reporting Services CTP Until Microsoft Sells SQL 2008
Mar 31, 2008There are a few features in the new SQL Server - Reporting Services that I really need in production. I have tested everything and it works great. I am running the CTP version since Microsoft is saying they aren't releasing the release version until 3rd quarter 2008.
Since Microsoft won't sell SQL 2008 until 3rd quarter, can I run the CTP in production until the release and then purchase SQL 2008?
Jim
Seeking Advice: SQL Server On Win 2008 Virtual Server Or Just Win 2008?
Apr 23, 2008
Hello - does anyone have experience w/SQL Server 2005 in a virtual environment? I'm considering this for a production environment but not sure if performance will suffer. Our databases will have a lot of writing but not too much reading. A SSRS solution is currently the only app. connecting to the SQL db. Max users to server at any given time will be very low (~10 users max). But the databases are pulling in data from other, outside multiple data sources on a daily basis.
Any pointers to documentation or any advice?
Thanks,
A Brown
Problem With Windows Server 2008 And SQL 2008 Express
Feb 25, 2008Hello!
Recently, I set up server with Windows Web Server 2008 RC1, SQL 2008 Express beta, .NET 3.5, IIS 7.
I'm running ASP.NET web application with SQL database. Everything works fine until the first application state on the server expires. After that, any postback that starts a new application state on the server and connects to the database, results in the following error:
Failed to generate a user instance of SQL Server due to a failure in starting the process for the user instance. The connection will be closed.
Is this a bug that will be fixed in release of Windows / SQL or am I doing something wrong?
Many thanks for help,
Jan
SQL 2012 :: CheckSum Agg Function Returns 0 For Even Number Of Repeated Values?
Aug 14, 2014From what I've seen, the CheckSum_Agg function appears to returns 0 for even number of repeated values. If so, then what is the practical use of this function for implementing an aggregate checksum across a set of values?
For example, the following work as expected; it returns a non-zero checksum across (1) value or across (2) unequal values.
declare @t table ( ID int );
insert into @t ( ID ) values (-7077);
select checksum_agg( ID ) from @t;
-----------
-7077
declare @t table ( ID int );
insert into @t ( ID ) values (-7077), (-8112);
select checksum_agg( ID ) from @t;
-----------
1035
However, the function appears to returns 0 for an even number of repeated values.
declare @t table ( ID int );
insert into @t ( ID ) values (-7077), (-7077);
select checksum_agg( ID ) from @t;
-----------
0
It's not specific to -7077, for example:
declare @t table ( ID int );
insert into @t ( ID ) values (-997777), (-997777);
select checksum_agg( ID ) from @t;
-----------
0
What's curious is that (3) repeated equal values will return a checksum > 0.
declare @t table ( ID int );
insert into @t ( ID ) values (-997777), (-997777), (-997777);
select checksum_agg( ID ) from @t;
-----------
-997777
But a set of (4) repeated equal values will return 0 again.
declare @t table ( ID int );
insert into @t ( ID ) values (-997777), (-997777), (-997777), (-997777);
select checksum_agg( ID ) from @t;
-----------
0
Finally, a set of (2) uneuqal values repeated twice will return 0 again.
declare @t table ( ID int );
insert into @t ( ID ) values (-997777), (8112), (-997777), (8112);
select checksum_agg( ID ) from @t;
-----------
0
Microsoft SQL Server 2008 CTP, February 2008
Mar 7, 2008
Hi all,
New to this so please be patient and please help.
I have developed an SQL 2005 Express command line option install for our company which has been working seamlessly for the last 18 months.
http://msdn2.microsoft.com/en-us/library/ms144259.aspx
I downloaded the €œMicrosoft SQL Server 2008 Express CTP, February 2008€? from http://www.microsoft.com/downloads/details.aspx?FamilyId=749BD760-F404-4D45-9AC0-D7F1B3ED1053&displaylang=en
I simply replaced the 2005 file €œSQLEXPR.EXE€? with the 2008 file €œ€?, recompiled the installation and tested only for it to fail. I than read the 2008 books online and noted the change in command line options.
http://www.microsoft.com/downloads/details.aspx?familyid=19DB0B42-A5B2-456F-9C5C-F295CDD58D7A&displaylang=en
http://msdn2.microsoft.com/en-us/library/ms144259(SQL.100).aspx
I then changed the command line to suit the Microsoft 2008 books online, recompiled the installation and tested only for it to fail once more.
Interestingly I tested the install from the default GUI and at the point of adding the €œsa€? login credentials it fails to allow the installation to proceed. Strangely by selecting the windows authentication credentials, €œnext€? than €œback€? it now allows me to add the €œsa€? login credentials and continues to install correctly as required.
I hope I have explained this clearly enough.
1. Is this a bug in the €œMicrosoft SQL Server 2008 CTP, February 2008€? installation?
2. If so is this causing the command line install options to fail?
3. How do I obtain a version of €œMicrosoft SQL Server 2008 Express€? that will work installing from the command line?
Thanks in advance.
SQL Server 2008 :: Restoring A Database / Server Using A Remote Server As The Service Call?
Jan 4, 2013if you can restore a database to Server B using Server A as the service. Meaning we would issue the command on Server A but somehow point to Server B as where we want the restore to happen.
The backup file would be in a location independent of both servers.
Difference Between SQL Server 2005 And SQL Server 2008 SSRS(Sql Server Report)
Apr 15, 2008Hi all,
Please tell me about difference between SQL Server 2005 and SQL Server 2008 SSRS(Sql Server report)
Why to upgrade for Sql Server 2008
Thanks,
Ashok
Sqlserver 2008 Can't Work With Visual Studio 2008
Dec 23, 2007when I try to make a sqldatasource with visual studio 2008 and SQLServer 2008 . I found that there are a message that the visual studio 2008 can support only SQLServer 2005 and SQLServer 2000how to make my visual studio 2008 support SQLServer 2008
View 1 Replies View RelatedSQL Server 2008 :: SSIS Package Fails Silently On Server But Works If Run Manually
Jul 7, 2015I have two calls to stored procedures that in an SSIS package fails silently. They are simply not executed in production but works fine in test, nothing happens and the sql server agent reports that everything has gone just fine.
In test they have 1 server with db A and B. No issue here.
In prod they have 2 servers with db A and B. On server 1 sql server agent executes a job that includes an SSIS package that on server 2 runs a couple of sp's. That user is db owner on server 2 db B and yet nothing happens. The sp's are not executed.
If I in prod run the job manually then it works, but not when run with the sql server agent account that as said is even db owner.
Visual Studio 2008;SQL Server 2005;SQL Server Compact Edition 3.5 Question
Aug 26, 2007I have a question about a problem that I cannot seem to tackle. I have installed the following programs on Windows Vista:
- SQL Server 2005
- Visual Studio 2008
- SQL Server Compact Edition 3.5
- SQL Server Compact Edition 3.5 Server Tools
I want to do the following:
1. I want to create a SQL Server Compact Edition 3.5 database in the SQL Server Management Studio
2. I want my SQL Express server in SQL Server 2005 to be a distributor and publisher
About 1. In SQL Server Management Studio I cannot choose SQL Server Compact Edition 3.5 .
ABout 2. I tried to setup my server to be a distrubutor by running a stored procedure with the following name: sp_adddistributor. I get the following error: This edition of SQL Server cannot act as a Publisher or Distributor for replication.
Does anyone have a solution to both problems.
How Can I Get The 'entire' Database, Structure And Data, From SQL Server 2008 To SQL Server 2005?
Jun 20, 20081) I can't get the 'copy database' function to work from SQL Server 2008 to SQL Server 2005. I connect ok. Everything goes to the last step and then it fails.2) I cant get a SQL server 2008 backup to restore on SQL SEerver 2005 either.
The only way I know that works is to script the creation of all tables then export and import. This does work.
How can I get the 'entire' database, structure and data, from 2008 to 2005?
ThanksSQL newbie.