Workflow - Precedence Constraint
May 1, 2008
Hi,
I have 3 data flows connected sequentially on my workflow before processing dimensions and facts which checks data from different databases and if conditions does not meet then writes to log table. So if it writes to log table , I have to quit and finish the workflow.
How can I do that?
thanks,
J
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Jan 3, 2008
I have three control flow tasks that are executing in consecutive order. Tasks 1 and 3 will always execute, but sometimes (based on an expression) task 2 will not. I would like to use precedence constraints in such a way that task 3 will execute regardless of whether task 2 executes, but in the event task 2 does execute, task 3 will only execute AFTER task 2 completes. Is there a way to accomplish this without setting the disabled property of task 2 at runtime?
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May 22, 2008
hi all - this is the first time i've worked with SSIS / Business Intelligence, and I'm having an issue with a piece of basic functinoality.
I'm working with some dtsx jobs which were all conversions from Sql Server 2000 DTS jobs. The conversion process "seemed" to go smoothly. I used the Migration Wizard, and it successfully converted my outputted DTS job files into DTSX files.
In the Business Intelligence design environment (Control Flow) for a specific dtsx package, I have two tasks that are linked together by a Precedence Constraint.
* Task A Truncates all data in Database B --> Table A
* the precedence constraint says that if Task A is successful, then go on to Task B (or at least i think it does)
* Task B copies the newest data from Database A --> Table A over to Database B --> Table A
Everything appears to be correct, but if i right-click Task A and perform an "Execute Task" command, Task A will run successfully, but then stops short without running Task B.
Are there any common "gotchas" or issues that I might be missing which would cause this behavior? I deleted the existing precedence constraint, and added back a new one with the same settings, but Task B still will not run.
thanks for any help on this
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Dec 20, 2007
I have two packages - one works, the other doesn't. Both have two tasks: an Execute SQL Task and a dependent Send Mail Task. I am using a precedence constraint where the evaluation operation is an expression evaluating a variable created by a select count(*) as variable in the query. Both variables are defined as int32, initial value of 0 with a scope for the entire package.
The expression that works tests for an error_counts > 0 condition; the one that doesn't tests for load_counts < 24. The > 0 sends mail when the error_count is greater than 0 but doesn't send mail when it is 0, which is as I intended. The less than 24 package always sends mail even though the variable resultset_singlerow is usually 24. When I look at both properties for the Execute SQL Task steps side by side, they have no differences. When I look at the properties for the constraint, the only difference is in the EvaluatesTrue, which is set to False for the one that works and True for the one that doesn't. Unfortunately, that property is grayed out (not modifiable) and doesn't seem to be an option when I edit via the Precedence Constraint Editor.
I've looked a Books Online & Google with no references to a similar situation. Does anyone have a solution? Is the EvaluatesTrue the problem? And if it is, how can I change the setting? If not, what is the problem?
Thanks in advance for any help.
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Dec 20, 2007
I have two packages - one works, the other doesn't. Both have two tasks: an Execute SQL Task and a dependent Send Mail Task. I am using a precedence constraint where the evaluation operation is an expression evaluating a variable created by a select count(*) as variable in the query. Both variables are defined as int32, initial value of 0 with a scope for the entire package. The expression that works tests for an error_counts > 0 condition; the one that doesn't tests for load_counts < 24. The > 0 sends mail when the error_count is greater than 0 but doesn't send mail when it is 0, which is as I intended. The less than 24 package always sends mail even though the variable resultset_singlerow is usually 24.
When I look at both properties for the Execute SQL Task steps side by side, they have no differences. When I look at the properties for the constraint, the only difference is in the EvaluatesTrue, which is set to False for the one that works and True for the one that doesn't. Unfortunately, that property is greyed out (not modifiable) and doesn't seem to be an option when I edit via the Precedence Constraint Editor.
I've looked a Books Online & Google with no references to a similar situation. Does anyone have a solution? Is the EvaluatesTrue the problem? And if it is, how can I change the setting?
Thanks in advance for any help.
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Jul 30, 2007
Hi all
I've got a package that checks the length of chars in a flatfile and if it's correct it executes the dataflow task.
How can i write an expression in the precedense constraint editor to skip the dataflow task if there is an error in the script task?
Thank you
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Mar 5, 2008
I am struggling here with precendece constraints and variables.
I have the following scenario:
Task A
Task B
Task C
@var1!=0
@var1==0
Task A, Task B and TaskC
Task A (Execute SQL Task which assigns a value to a variable say, var1) determines if TaskB will execute i.e.
IF var1 !=0 Execute Task B and then Execute Task C
IF var1== Execute Task C
Is this possible in SSIS?
Problem:
Each time I try to do this, the package never executes Task C. It always either Executes Task A or Task A and Task B.
For example if var1 !=0 it executes Task A and Task B
but if var1 == 0 it executes only Task A.
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Jan 5, 2008
I am confused with Precedence constraint editor regarding Evaluation Operation and Multiple Constraints options. In the Evaluation Operation dropdown list, there are: Expression and Constraint and Expression OR Constraint. Why it still needs LOGICAL AND and LOGICAL OR in the multiple constraints options? Is it clear that Expression and Constraint is "LOGICAL AND" and "Expression OR Constraint" is "LOGICAL OR"?
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Aug 31, 2007
Dear Friends,
In my controlFlow I have 2 sequence container... Sequence1 goes to Sequence2 if an expression valuate to TRUE.
If the expression value is true, than there isn's any problem and sequence2 runs, but if the expression is FALSE the sequence2 container doesn't run.
OK?
In the case of expression valueate to FALSE I need to generate an error or an information in order to get it in the eventhandler automatic...
I can add a script task to make the package failure... but what I insert in the precedence constraint editor from Sequence1 to the scripttask?
Imagine... the expression from Sequence1 to Sequence2 is a>=b
The expression from Sequence1 to ScriotTask os a<b? (How can I define this only to run when the expression (seq1 to Seq2) is false??
Someone know how?
Regards!
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Feb 28, 2007
SQL Server 2005 now provides the ability to use expressions in the plans instead of just the Failed/Success/Completed constraints.
Can anyone tell me what language is used for these expressions. Where can I find a guide on this?
Thanks
Drew
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Feb 5, 2008
Hi,
Whenever I open my package, the Precedence Constraint lines get distorted. This makes my package look messy. Is there any way to stop this from happening?
Thanks for your help!
Subha
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Aug 27, 2007
Dear all,
I've been searching the article for error handling in SSIS but seems no article have same problem exactly as mine. In my package there's container, it contains Data Flow task and some of Script tasks. I put an error precedence from Data Flow task into Script task that contains script for log an error that might be occured. The Data Flow task imports data from flat file into SQL Server 2005 and I've set a semicolon as the column delimiter. Unfortunately there is a data in flat file that had one column contain semicolon as its value.
This would trigger an error and I hope the error would be logged into a table as I wrote inside Script task. But it didn't work. The error precedence won't work, the package stop in flat file source instead. I've been trying the event handler but it didn't work either. Maybe I got wrong implementation, anybody can help me explain the error handler and solve the problem ?
Here is the capture of my package, since I didn't know how to attach the picture in this forum.
Thanks in advance.
Best regards,
Hery
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May 16, 2015
I have (6) sequence containers, each with a data flow task and script task. The script task renames the file and the data flow uses an OLE DB Source connection to export to a flat file using the Flat File Destination connection.For sI have been unable to move from the 1st sequence container to the 2nd (and the next and so on...). I am trying to do this "on success" (on failure I generate an email notification within each container), but am apparently missing a piece to this because after the sequence container executes, which it does successfully, nothing happens.
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Dec 13, 2006
Greetings,
I have an expression in a precedence constraint that is returning false when it should return true. This is the expression that returns false:
((5500 / 9990) * 100) > 10
The following expression returns true. I did the division (5500 / 9990) myself and substituted the resulting value:
((0.55055055055055055055055055055055) * 100) > 10
Why is the first expression returning false? I'm stuck in the mud up to my axles on this and I know I'll probably feel like a fool when I learn the answer...
Thanks,
BCB
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Aug 1, 2007
I have designed an SSIS package that :
(1) contains a for loop task (in which all the logic is contained) that loops through a particular folder for excel files
WITHIN THE FOR LOOP:
(2) pulls data from an excel file into SQL Tables(Data Transformation Task)
(3) run stored proc to validate data (Execute SQL TASK)
(4)ON SUCCESS of executing the SQL Task (Script Task - move file to success or reject folder based on value returned from sproc)
(5)ON FAILURE of executing the stored proc (Script Task - move file to bad format failure)
NOTE:
I have modified the MaximumErrorcount property of (1 FOR LOOP) and (3 EXECUTE SQL TASK) and the package itself to 0.
In order to deal with badly formatted excel files...I do not want the package to stop for every missing tab in excel file or data entry error. I simply want the badly formatted file to be moved to a special folder
PROBLEM:
on failure logic is never executed (I have 2 options after step (3)) on success do step (4) on failure do step (5)
step (3) fails...then it simply iterates to the next file
step 5 is never executed
Is this because I changed the maximumerrorcount property?
What am I doing wrong witht he Precendence Logic?
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Aug 4, 2015
I am creating one SSIS package where my source is oracle. I have transferred the data from Oracle to flat file as per client requirement.I have to create single package for 2 country 1 is US and another is CANADA Columns are below
ZONE_ID,
ZONE_NAME
Zone Id having data like 10001,10002,10003,20001,2002,2003
Where zone_id start with 1000 is US Zone and Zone_Id start with 2000 is Canada Zone.
For US:
1. Load geography data from DB tables into flat files
2. Load geography data from flat files to Spectrum DB tables
For Canada:
1. Load geography data from DB tables into flat files
2. Load geography data from flat files to Spectrum DB tables
Now I want to look from flat file if Zone_id start with 1000 then it must go to US_DFT and if Zone_id start with 2000 then it must go to CANADA_DFT.
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Jul 29, 2015
Send Mail task not working properly when it configured in Precedence Constraint (Failure)...
Scenario:
I'm using multiple containers in my ssis package. Also I have configured mail task for capturing error.
I'm getting mail only when error occurs in foreach loop container. If error occurs in other containers it doesn't works.
Actually I would like to receive mail notification on error when it occurs in any of the containers or DFT.
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Jul 12, 2005
Hi all,
I've got a DTS job which has lots of tasks in it. I've also got quite a few flows of workflow and i've noticed that a task won't execute if it has both Failure and Success workflow pointing to it... It can have multiple failures pointing to it and it will execute but it can't have multiple successes or a combination of workflows...
Does anyone know a way to get around this or to change the 'AND' ing that seems to be on the workflow going into a task..
Thanks.
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Jan 12, 2005
Howdy,
Now this one I don't think will be fixed by changing the length of a variable.
Anyway, In this nifty DTS package I've created I have it set so that on the failure of an SQL task DTS should send me an e-mail letting me know it failed. The SQL statement in the DTS task is "EXEC WEB_Check_Files". In the Stored Proc I then call RAISERROR w/ a user defined error message w/ severity 10. When I call RAISERROR the DTS packages logs everything just kosher but skips past the "on fail" e-mail message. It refuses to execute it and don't know why. Spent the last hour or two going through docs looking at RAISERROR. Tried RETURN 1 to see if that would do anything and nadda. I also don't have "Fail package on first error" checked.
Don't know if it matters but I'm executing the package through the "play" button in Enterprise Manager.
So... anyone got an idea? I'm fresh out.
Yall rock!
Thanks,
Me
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Aug 13, 2004
I hope I've done due dilligence before posting for help. I've combed a lot of Google and dBforums search results with no luck.
Anywho, this *seems* like it should be simple: I have a Transform Data Task, into which I've introduced deliberate errors, followed by an ActiveX Script Task that is supposed to fire based on the failure of the Data Transform Task. The second task is joined to the first via an "On Failure" workflow step.
The problem: The second task never fires. The first task fails as expected, but the second one just shows the "Not Run" indicator in the package results after executing.
Here is a graphical illustration of the package and results: http://www.bountifulware.com/blogs/rex/dtsproblems.html
I've experimented with the transaction settings in the package properties, as well as the transaction settings in the workflow properties of each step. I don't particularly want the package as a whole to be couched in a transaction, but if that is part of the equation for making the "On Failure" step fire, I'll happily go along. Also, in the Data Transform task with the deliberate errors, I have the max error count set high, as I want the task to continue logging errors for each record that chokes. I've tried various settings there as well, however.
Thank you in advance -- I'll try to contribute more and leech less after this.
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Feb 5, 2008
I would like to build a workflow system where 100 processes are requesting an item from a ~1.000.000 items large DB, process that item and move it to the next state. The problem with the current implementation I tried is that I get deadlocks....
The DB table looks like:
CREATE TABLE Transactions(
itemid CHAR(32),
status TINYINT not null default 0,
result INT not null default 0,
lockby TINYINT not null default 0,
.... (etc.)
PRIMARY KEY(refno)
);
CREATE INDEX IxStatus on transactions (status)
Each process (with his own ID) is doing 4 step:
1) update transactions set status=1, lockby=<ID> from
(select top 1 itemid from transactions where status=0) as t1
where t1.itemid=transactions.itemid
2) select itemid from transactions where status=1 and lockby=<ID>
3) process item
4) update transactions set status=2,result=<RESULT> where itemid=<ITEMID>
Does anyone has a suggestion on how to do this?
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Nov 13, 2006
I know the idea was to seperate workflow and dataflow, but I have come across a scenario where it would be useful for a branch of a dataflow to wait until another branch has finished.
I have some transactional data which records events for the start and end of a session. I want to build a list of unique sessions with the start and end date. I currently have the list of events sorted by time, followed by a conditional split for the start and end events. I can then insert all of the start events and would like to wait until all of the starts are inserted before updating them with their relevant end times.
Is this achievable?
Does anyone else think it would be a good idea to be able to set precendence across multiple branches of a data flow?
Does anyone have a better solution?
I know this is the wrong forum, but is there a way to model this against the transactional data in SSAS, I will move this question to the SSAS forum if anyone can think this would work!
Philip Coupar
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Jun 14, 2006
Hi
Can any one provide sample for work flow in SSIS . and how to excute package conditionaly like if package1 is sucess then excute package2 else excute package3 .( more like writeing batch file in Data Stage ETL Tool ).
Thanks & Regards
Jegan.T
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Apr 16, 2007
Hello,
I have a SQL Server 2000 DTS package in which the first step executes a batch file. The batch file contains FTP commands that log into an FTP server, and pull down whatever file is there.
I set up a failure workflow to send an email if the step fails. When I have a SQL Server job run this package, and there is no file to dowload, the whole package fails without the failure workflow result firing.
For the step (DTSStep_DTSCreateProcessTask_1), I have the 'FailPackageOnError' property set to -1. In the package properties, I have the check box for 'Fail Package on First Error' cleared.
What do I need to do so that the failure workflow occurs when the step fails?
Thank you for your help!
cdun2
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Jan 16, 2007
Trouble with Workflow
Hello. I have a DTS package that executes some tasks of the type "Execute Package Task".
Every Task has a Condition of been executed just in case of success. I understand that only if the precedent task ends successfully the next one would be processed. My problem is that the DTS continues even if one of the previous steps fails. Would you have any idea?____________________________________________________________________
My escenario is something like this:
EP: Execute Package Task
ES: Execute Sql Task
______ _____
EP# 1 (on success) ----> EP# 2 (on success) ----> ....
______ _____
So, EP#1 fails but EP2# is also executed.
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Feb 1, 2007
i created a DTS package in SQL 2000 using the enterprise manager.
I have defined a SQL task to drop some temporary tables on failure of another SQL task. Also the same temporary tables need to be dropped on success of another task. the on success workflow is working fine. but when i add the on failure workflow to the temporary table dropping task, the temp table droppin is not getting excuted at all either for success nor for the failure. please help me out.
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Jul 27, 2006
Hi,
I just recognized a strange displaying problem in one of my SSIS jobs.
I created job which contains a sequence container. Within the sequence container there is one "Execute SQL Task" and one "Foreach Loop Container". Within the "Foreach Loop Container" there are 4 task which are connected with precedence constraints.
Now my problem is that if I load the SSIS job and open the "sequence container" while the "Foreach Loop Container" is already open then the precedence constraint won't be displayed. If I close and open the "Foreach loop container" again then the precedence constraints will be displayed again.
My first assumption was that it might be a problem with the display drivers of the computer ....however the problem appears also on any other computer.
Does anyone know how to solve this display problem without closeing/reopening the container?
Thanks,
StSt
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May 13, 2008
Hi, all.
I am trying to create table with following SQL script:
Code Snippet
create table Projects(
ID smallint identity (0, 1) constraint PK_Projects primary key,
Name nvarchar (255) constraint NN_Prj_Name not null,
Creator nvarchar (255),
CreateDate datetime
);
When I execute this script I get following error message:
Error source: SQL Server Compact ADO.NET Data Provider
Error message: Named Constraint is not supported for this type of constraint. [ Constraint Name = NN_Prj_Name ]
I looked in the SQL Server Books Online and saw following:
CREATE TABLE (SQL Server Compact)
...
< column_constraint > ::= [ CONSTRAINT constraint_name ] { [ NULL | NOT NULL ] | [ PRIMARY KEY | UNIQUE ] | REFERENCES ref_table [ ( ref_column ) ] [ ON DELETE { CASCADE | NO ACTION } ] [ ON UPDATE { CASCADE | NO ACTION } ]
As I understand according to documentation named constraints should be supported, however error message says opposite. I can rephrase SQL script by removing named constraint.
Code Snippet
create table Projects(
ID smallint identity (0, 1) constraint PK_Projects primary key,
Name nvarchar (255) not null,
Creator nvarchar (255),
CreateDate datetime
);
This script executes correctly, however I want named constraints and this does not satisfy me.
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Dec 29, 2000
I know this sounds bizarre, but hey... this is DTS, right?
For ALL of my local packages on a particular server, when I open them with DTS designer on my workstation, everything is fine - I can even execute them. When I log onto the server locally, and open them, the workspace is empty!!!
They are stored as local packages. As I said, I can execute them within designer on my workstation, but if I try to run them via dtsrun, I get an error saying "No Steps have been defined for the transformation Package." And when I look at them on the server, that appears to be true.
One last thing (I know you've heard this before)... Everything was working fine last week - that darn Santa.
PLEASE HELP!!!
Thanks,
Andy
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Aug 22, 2002
I have just installed MS Office XP developer and MS SQL Server 2000 as
I would like to use the workflow aspects of this. The problem is that
the installation of XP developer wil not install "Workflow Services for
SQL Server" as it says one needs SQL Server 7.0 SP2, but I have SQL Server 2000 SP2.
Has anybody come across something like this.
Thanks
Donnacha
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Aug 22, 2007
HI,
We are currently trying to import the Data from one DB to Multiple DBs.And these multiple DBs connection strings must be configurable. This I can do it by reading the connection strings from dtsconfig file and execute it for each DB.Is it possible to execute for all the DBs in parallel(Multithreaded).
Thanks,
Sabari.
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Aug 21, 2007
Hi, not sure my subject title makes it clear what I want but here it is.
I have a workflow which basically looks at an excel file in a folder on the local drive and then does loads of stuff to it. Everytime I want to process a different excel file that is in the same location al I have to do is change the value of a single local variable, which is just the name of the excel file.
Is there a way to make this automatic? For exmaple....could I somehow put my whole workflow inside a loop that looks inside that local folder and one by one, get the name of the file, assigns the name to that global variable, and then runs the flow...and continues to do that until it gets to the end??
any help would be greatly appreciated...thanks!!!!
andy
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Jun 14, 2007
Hi,
this is a bit of an open-ended question. but,
is it possible that you can use SB as part of a workflow engine?
SB sends messages backwards and forwards on a conversation so I am guessing that there is some way that the application can "work out" which person to send a particular message to ?
I've seen examples like an expense form being filled in and sent to a manager, presumably you can specify if the manager accepts or rejects the expense form?
I know there is windows workflow, but, i thought using SB is an alternative?
MrPeds
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