Precedence Constraints
Nov 7, 2007
Hello,
I've recently begun exploring Integration Services and have a question regarding a Control Flow element.
I'm trying to understand precedence constraints. Specificially, the logical AND and logic OR components. If I have two constaints A and B where A is using a logical AND and B is using a logical OR, how are the constraints evaluated? The Evaluation Operation is set to "Expression and Constraint" for both constraints.
If my understanding is correct, path A would be followed if both A AND B are true. Path B would be followed if A OR B is true. Is this correct?
Regards,
Orlanzo
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Jan 25, 2007
Has anyone seen precedence constraints disappear in a package after closing and opening again? In this case, it's not package-wide. Only constraints inside one Foreach Loop container disappeared. Any idea what causes this to happen?
p.s: Yes, I did Save All. Most of these contraints were saved in the package for more than a week anyway.
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Aug 29, 2006
Hello,
I have a package that executes 2 sql tasks then another SSIS package. My precedence constraints between sql task 1 and sql task 2, and sql task 2 and the SSIS package check that @ErrorValue == 0.
@ErrorValue is set after each sql task (both of which execute stored procs) with the value of the output parameter for the stored proc. I have run both stored procs on the server and both return 0 in the output parameter.
When I run the package the two sql tasks execute as expected (tasks turn green indicating success) but the package stops at that point and the SSIS package task never executes.
If I remove the second sql task and connect the first sql task to the package task with the @ErrorValue == 0 precendence constraint the package task still does not execute (even though the constraint worked to get the sql task 2 to execute).
The package only runs if I remove the expression in the second precedence constraint (between sql task 2 and the package) thus changing it to simply 'on success'.
Please help!
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May 3, 2006
Is it possible to use objects in precedence constraints? For example, I have a collection object that may or may not be populated in a script at some point and want to be able to execute different paths depending upon whether the Count property equals zero or not.
I realize I could very easily just create another int variable and populate it accordingly, but I am just curious about this. I couldn't get it to work, but then I am really just starting out here and just not sure if I am doing it wrong.
Thanks!
Brandon
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Jul 17, 2007
I have about 12 sequence containers mapped out to execute separately based on a precedence contraint and an expression. These lie at the same level and order in my sequence. Only one of these will execute based on an expression. After any of these executes, I have a consecutive sequence container that I'm attempting to execute. I've set the precedence contraint from all twelve of the prior sequence containers to this single sequence container that I would like to run after any of the 12. My problem is that the package will only allow one of these twelve sequence containers to become a precedence of this second single sequence container at a time. The package will let me graphically attach the precedence constraint from all 12 to this single sequence container, but when the package runs, it fails to follow through to this single sequence container. I'm trying to figure out why this is the case and how I can get what I would like to work -- work. Thanks.
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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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Jun 20, 2007
Is it possible in a precedence constraint to have multiple expressions evaluated? IE
Operation set to Expression and expression to evaluate is: @File = x or @File = y
Thanks
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Dec 20, 2007
I have created a task that uses a ForEachFile Loop. Within that loop I load 5 files. Once those 5 files have loaded successfully I want to run a stored procedure. I placed this stored procedure into a script task. The script task has 5 precedence constraints,. They are a success on the load of the files. When I run the task, the 5 files load, but the script task will not start. I have gone so far as to check each load individually to see if it would start the script task, which they do. It's only when I add more than 1 precedence constraint that the script task will not run. The precedence constraints are set to AND, so they all are required. They all succeed. What am I doing wrong?
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Mar 17, 2006
Hey everyone,
I have used the set values option of the execute package utility many times to change values on variables in the package with no problem before, however have run into a stumbling block when coupling this with precedence constraints. I have a package that goes down a different path based on a precedence constraint that works perfectly if the default value of a variable is used....however when I pass in a new value via Set Values in the execute package utility the package will error out with this:
The expression "@[User::IVR_FLAG] == 1" must evaluate to True or False. Change the expression to evaluate to a Boolean value.
IVR_FLAG is an int with a default value of 1, and if left that way(or changing it to another value in the package, as long as the default is used) this error will not occur....it will go down the proper path. But when Set Values is used to run the package to change IVR_FLAG, the above error occurs, which doesn't make sense since the above expression should still evaluate to either true or false. Anyone have any thoughts or suggetions?
Thanks,
Adrian
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Aug 30, 2006
I had a Send email task linked to my Sequence Containers in my package and it was working fine. Everytime the container fails it would send an email to myself.
At some point all Failure constraints stopped working. Failure constraints work if I add brand new tasks, but with the existing tasks, they don't work. The Task which fails, turns red and execution stops. Next failure task is not executed.
I am not sure what triggered it to stop working. I cannot get anything on the log
Any help is appreciated.
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Oct 29, 2006
This is more a medium level annoyance than a problem. When I save a package, close it and later re-open it, the precendence constraints end up all over the place making my neatly layed out diagram a shambles.
Call me anally retentive if you like (you wont be the first ), but I find this extremely annoying. Does anybody else have this problem? Does anyone have a solution?
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Jan 9, 2007
I know this is probably a flick of a switch but I cannot figure out which switch. Setup is SQL Server / Stored Procedures / DAL / BLL(skipped for testing) / PL. The stored procedure queries from only one table and two columns are ignored because they are being phased out. I can run the stored procedure and preview the data in the DAL but when I create a page with an ODS linked to the DAL and a GridView I get this error. I checked every column that does not allow nulls and they all have values. I checked unique columns (ID is the only unique and is Identity=Yes in the table definition). I checked foreign-key columns for values that are not in the foreign table and there are none. Any ideas why do I get this?
Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.
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Jan 17, 2008
Hi,
I am getting the above error when trying to load a report into my Web Application, I have tracked the error down to one specific field in my database. Even though this field is a NVarChar field and is of size 30 it would seem that there is an issue returning the value from the field. I can write it into the database no problems but when I try to get it out of the database it returns the above error.
e.g
MOB 401.908.804 - Fails
0401.907.324 - okay
8239 9082 (pager) - fails
Anyone got an idea on how to fix this????
Regards..
Peter.
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Mar 13, 2008
How is the column precedence determined when more then one column is included in the group by clause? I am using T-SQL.
for example:
SELECT VendorName, VendorState, SUM(Invoices.InvoiceTotal) AS InvoiceSum
FROM Vendors JOIN Invoices ON
Vendors.VendorID = Invoices.InvoiceID
GROUP BY VendorState, VendorName
I would expect this statement to group by VendorState first but my result set is grouping by VendorName and then VendorState.
Am I missing something?
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Jan 31, 2007
Hi there!
I've a few tasks in my dataflow. Some of them are executed depending on an precedence constrain. Works fine.
The problem is following: I want to write a success message (execute SQL task), when all the tasks who have been executed have done this with success. For example, i ve ten tasks, and 2 of them are executed (successfully). This is good, i want to execute my task to write the success message.
I tried to set these precedence constraints with EvalOP = ExpressionOrConstraint, Values = Success and an expression, what returns TRUE, when the task above is not executed (the condition from a precedence constraint above). But the task to write my message will never be executed, because it seems the task does'nt give any result (neither success nor failure) when they ar not executed, and so my AND-Constraint for the success message task will only get TRUE, when ALL task are executed (and successful).
Is there any chance to get somethink like "isSuccess OR IsNotExecuted" into a precedence constraint?
Thanks, Torsten
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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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Aug 7, 2006
Hello folks,
I have probably a dumb newbie question but I can't find the answer anywhere.
On my Control Flow design pane I have two objects: a SQL task object and a Data flow task object. The first 'points' to the second. From my digging I believed that by indicating with the arrow from 1 to 2 that 1 would execute to finish before 2 was started.
My SQL taks is to truncate a table to receive the new data coming from the data flow task object. Instead 2 executes first and then 1. You can imagine producing an empty table was not my goal for this package.
Can anybody give me a clue?
Thanks....
Jim
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Apr 29, 2004
I'm having problems with the query below. It works fine until the "NOT IN" part and I'm not sure why. Basically, I'm getting records where their educ_audio field is set to "no". I've messed with the parens to try to force SQL to process the NOT IN part before the other clauses without avail. Can someone shed some light?
TIA
SELECT distinct contacts.fname, contacts.lname, contacts.company, contacts.contact_id, contacts.business_phone, contacts.emailAddress, contacts.dateLastContact FROM journal INNER JOIN contacts ON journal.contact_id = contacts.contact_id INNER JOIN products ON journal.product_code = products.product_code WHERE ( journal.product_code IN ('ABLE') ) OR (( journal.product_code IN ('JOBS') ) AND ( journal.product_status IN ('12','14','15') )) OR (( products.prod_design IN ('audio') ) AND ( products.library_code IN ('hrss') )) AND (journal.journal_id NOT IN (SELECT journal.journal_id FROM journal INNER JOIN contacts ON journal.contact_id = contacts.contact_id INNER JOIN products ON products.product_code = journal.product_code where ( contacts.educ_audio IN ('no') ) )) ORDER BY contacts.lname asc, contacts.fname
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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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May 2, 2006
An application filters records based on names found in them. Forexample, looking through property buyer names, looking for banks andrelocation companies.I have a table of names and patterns:CREATE TABLE #Filters (Pattern varchar(100), IfWildCard int, Categoryint)INSERT #Filters SELECT 'Bank Of America', 0, 1INSERT #Filters SELECT '% Bank %', 1, 2INSERT #Filters SELECT 'Bank %', 1, 2INSERT #Filters SELECT '% Bank', 1, 2INSERT #Filters SELECT 'Credant Reloc%', 1, 3INSERT #Filters SELECT '%Relocation%, 1, 3The filtering matches the table of candidate names against the filters,and returns Category, where the where clause or join is(Candidate = Pattern AND IfWildCard = 0)OR (Candidate LIKE Pattern AND IfWildCard = 1)"Bank of America" matches an exact pattern, and also a wildcardpattern, and the two different matches give different values forCategory. Is there a way to control which match takes precedence, oris necessary to do it multiple times in the desired order, removingthose that hae already matched from consideration?Thanks,Jim Geissman
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Aug 21, 2007
Hello,
I have a SQL Task the executes the following statement;
SELECT COUNT(SettleDate) AS CountResult
FROM SettleDateCount
I have the SQL Task Editor configured for a Single Row result set. The Result Name is CountResult, and the variable it populates is RowCountRes. RowCountRes is Int32 with EvaluateAsExpression set to False.
I have a boolean variable called RowCountStatus. It evaluates as the following expression;
@[User::RowCountRes] > 1
From the SQL Task, I have two different constraints, both of which evaluate with an expression. One constraint evaluates this way; @[User::RowCountStatus] = True
The other evaluates this way; @[User::RowCountStatus] = False
The idea is that if the count comes back from the sql statement greater than 1 then execution continues down one path, else it goes down the other path. Currently, the result comes back = 1. I expect that the 'False' path will execute, but the 'True' path executes instead.
What am I doing wrong?
Thank you for your help!
cdun2
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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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Feb 14, 2007
I have three sequence containers setup to run in parallel. I have a final step that parses the log file and displays results, and I want to this to occur when all three containers have completed, success or failure. I therefore have a constraint from each container that feeds into my final step, and all three constraint types are set to "completion".
When I run the package and one of the tasks within a container fails (and fails its parent, but not the package) the final step is not executed.
If I take off all the constraints except one, the final step is executed as expected.
I am using checkpointing if that has any impact. Disabling it makes no difference.
Any thoughts/alternatives I might try?
thanks
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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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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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Jun 15, 2007
hi all,
i have a package here which updates a DB from a flat file source.now the problem is i may get multiple files.i have used a for each loop to handle this. it takes files based on the files name9(file names has a timestamp in it).but i want to give files in order of its Creation time.
Please help me on this.i have written a script task before the for each loop and i have got the minimum creation date from all the files,i am not able to going forward from here.
does any body has an idea!!
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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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Dec 5, 2007
I have DTSX package where all the Control Flow Boxes are connected by precedence constraints (the Green Lines).
However, only half of them visible!
If I try and add another it says:
Cannot create connector.
Only one workflow can exist between the same two executables.
I don't want to have to drop and create them all the constraints (because there are a lot of them!)
But I can't even do that - since I can't see them, I can't select them; and I don't think I can delete them without being able to select them. Am I missing something? Zooming in makes everything larger, but it doesn't make my Green Lines reappear.
Help!
And yes, I'm using the latest version of everything:-
Microsoft Visual Studio 2005
Version 8.9.50727.762 (SP.050727-7600)
SQL SERVER 2005
9.00.3054.00 SP2 Developer Edition
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Jun 18, 2002
This is a bug that I submitted to Microsoft. I wanted to see if anyone could assist me with a work-around.
1. Create a new DTS Package
2. Add an ActiveX Task and change 'Main = DTSTaskExecResult_Success' to 'Main = DTSTaskExecResult_Failure'.
3. Running this package will result in a Failed package.
4. Save Package as 'Failure' to local server
5. Create another new DTS Package.
6. Add an 'Execute Package' task, and configure the properties to have it launch the saved 'Failure' child package.
7. Add an ActiveX task and then click ok to close it.
8. Select the Execute Package task (which executes the failure package), hold control and click the ActiveX task. Add an 'On Success' Precendence constraint from the 'Workflow' menu.
9. Now execute the package. Notice that the ActiveX task will execute even though the Execute Package task FAILED.
10. If you change the Precendence constraint from 'On Success' to 'On Failure' the ActiveX task will not run, because the package thinks that the Execute Package task completed with success.
In summary... if a child package, executed by an Execute Package task fails, the Execute Package Task ALWAYS "reports" success to the following precedence constraint and the package continues to run. Even if 'Fail Package on first error' is enabled. Although you will see that the task actually failed while watching the status of the package execution.
I am currently trying to write vbscript in an ActiveX task that will follow an Execute Package Task. I am trying to make the vbscript check and see if the previous task really did succeed or fail, and then make the ActiveX task succeed or fail as required to make the precedence constraints work properly.
I have replicated this problem on many different machines.
---------------------------------------------------------------------------
Any ideas for my ActiveX task? I am trying to access the StepExecutionResult from the Execute Package task, and I have been unable to. If I can get the Step Execution reult, then I can in turn cause the ActiveX task to suceed or fail, based on the execution result of the Execute Package task.
Thank you for your time,
David Zebrowitz
dzebrowitz@apartners.com
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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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