Looking 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.
do 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
Dim srv As New Server(".SQLEXPRESS")'
srv.ConnectionContext.ConnectionString =connection string
Dim bk As New Backup
bk.Action = BackupActionType.Database
bk.Database = application path+""+databaseName+".mdf"
Dim bdi As New BackupDeviceItem(backuppath+""+databasename+ ".bak", DeviceType.File)
bk.Devices.Add(bdi)
bk.Initialize = True
bk.Incremental = False
bk.SqlBackup(srv)
This is a pretty standard procedure for doing backups. For some reason I am getting 'Failed to connect to server. Cannot open user default database. Login failed' for MachineNameAdministrator' error message.
This error message appears when the application is loaded on to windows 2003 machine. However I have been able to do one backup on this machine in the last 2 days, so there appears to be some erratic behaviour. I am able to connect to the server to read the last database backup date (This function also occasionallly fails to connect to the server.)
This login failure does not seem to be present when I load this application on XP machines.
Hello,
If i backup a database and then restore it, would physical structure remain the same? specially fragmentation.
I'm concerned about output of DBCC SHOWCONTIG.
Senario: I want to check if client database needs defragmentation, so he's sending db backup file. But is it possible that when i restore it fragmentation info has got lost?
Thank you.
STG Labs
I want to automate backup and restore operation in T-sql script I need to give resource server,database and backup file location as input and then I need to restore that backup in different server so I want to give destination server as input too.
View 4 Replies View RelatedI got the backup failed with error 665.
We have a scheduled weekly full backup job running through maintenance plan. We are using Sql 2008r2. Our backup server is windows 2008R2. There is plenty of space in the backup server but still my database full backup failed with the following error.
Executing the query "BACKUP DATABASE [Test] TO DISK = N'C:fullbackup." failed with the following error: "Write on "C:fullbackup est_backup_2015_04_12_200003.bak" failed: 665(The requested operation could not be completed due to a file system limitation) BACKUP DATABASE is terminating abnormally.
I'm using SQL Server 2012 Analysis services in Tabular mode and connected to Oracle Database and while importing, I'm getting below error after importing some rows.
OLE DB or ODBC error: Accessor is not a parameter accessor.. The current operation was cancelled because another operation in the transaction failed.
Hi
What is the purpose of checksum function???
RKNAIR
Hi,
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
Please 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
--
Hello All,
How to use CHECKSUM function and how it is useful?
Thanks
Sanjeev
I'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 RelatedHi,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 RelatedHi,
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
Hi,
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
it 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 RelatedHi:
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,
Morning 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
Hello,
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
what is the use of check sum in sql server:
ex: RESTORE DATABASE [XXX] FROM DISK = 'XX.BAK' with check sum
How much of a performance impact will using Cheksum have over Torn Page Detection for Page Verify Recovery? Thanks
View 3 Replies View RelatedWith 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
Hi,
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.
For 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.
I 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
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)!
From 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
I'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]....
Hi there
I'm getting this message on my third automated backup of the transaction logs of the day. Both databases are in full recovery mode, both successfully backed up at 01.00. The transaction logs backed up perfectly happily at 01:30 and 05:30, but failed at 09:30.
The only difference between 05:30 and 09:30's backups is that the log files were shrunk at 08:15 (the databases in question are the ones that sit under ILM2007, and keeping the log files small keeps the system running better).
Is it possible that shrinking the log files causes the database to think that there hasn't been a full database backup?
Thanks
Jane
I am running SQL Server 7. I have an user that need to run the Set Identity On a table, and he gets an error message:
Server: Msg 8104. The current user is not the database or object owner of table 'tpartners'. Cannot perform SET operation.
I can grant this user with DBO user role, then he can edit anyting on the database.
Is there a work around that he can run the Set cmd and I don't need to grant him the DBO user role?
HiI have a database with full recovery model.Every night at 11.00pm performs full backup, and dayly every 3 hoursperforms differential backup, and trasnactional log backup performsevery 15 minutes during a day.I am interested what operations i can not recover from log ordifferential backup.I saw that when i drop table i can recover it from log backup, but isthere some operation that can not be recoverThanks a lotAlex*** Sent via Developersdex http://www.developersdex.com ***Don't just participate in USENET...get rewarded for it!
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