Job Is Not Executing In Parallel
Oct 22, 2006
I just thought I would share this info:
I created the package to download 4 ftp files at once.
I set the MaxConcurrentExecutables for the SSIS package to 4. So in BIDS in downloads 4 files at the same time.
However, when I started the job I noticed that only 3 files were downloaded at the time (looking at temp files in download directory)
Solution:
Sure enough after digging around for awhile - in Step properties for SSIS package - there is execution tab - and "Maximum Concurrent Executables" was -1 (which for some reason defaults to 3 concurrent processes even on our dual CPU server) - so after chanign that value to 4 - tada - all 4 files in parallel
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Mar 29, 2006
I have three SQL tasks executing in parallel in an Integration Services package.
+-B-+
A-+-C-+-E
+-D-+
It starts with task A; then B, C, and D all execute in parallel; and finally task E runs after BCD are done.
B, C, and D are all Execute SQL tasks, all with the same connection manager. Here is their code:
B) SELECT CASE WHEN COUNT(*) = 0 THEN 0 ELSE 1 END AS Process
FROM temp_B
C) SELECT CASE WHEN COUNT(*) = 0 THEN 0 ELSE 1 END AS Process
FROM temp_C
D) SELECT CASE WHEN COUNT(*) = 0 THEN 0 ELSE 1 END AS Process
FROM temp_D
Each one is setting a binary value to a package variable (using Result Set settings) based on the count of records from different tables.
This works with no problems when I run it against one server (development). But when I switch to the production server, task B and D both fail. I'v checked to make sure all of the temp tables exist in the database for that connection manager and that all three have the same connection manager - all is okay.
Here's the trickier part. When I'm still pointing to the production server and I run these tasks individually, they are all successful. It is only when they are attempting to run in parallel that they fail.
Here is the Output error:
Error: 0xC002F210 at Process Med?, Execute SQL Task: Executing the query "SELECT CASE WHEN COUNT(*) = 0 THEN 0 ELSE 1 END AS Process FROM temp_B" failed with the following error: "Invalid object name 'temp_B'.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.
What could be causing this? I'm at a loss.
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Dec 28, 2007
Hi,
Can we execute multiple instances of the same SSIS package simultaneously??
If yes, how?
If no, what is the work-around to simulate such a functionality?
Thanks in advance.
Regards,
B@ns
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May 30, 2015
I have about 30 different reports that I want to pull into a dashboard. I need to make sure that they don't execute in serial to get good performance.
There are two ways I can approach it
1) I can create a stored procedure for each report and then make sync calls for each of the reports from the web site. So, basically this will be controlled from the web end.
2) I can do this from the SQL Server database, if there is someway to execute these stored procedures in parallel.
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Jan 24, 2008
Hi,
I have a web application using Stored Procedure (SP). I see that there's a SP taking long time to execute. I try to capture it by Profiler Tool, and find out that with the same SP on the same db with the same parameter. The duration of executing by my web app is far bigger than the duration of executing on SQl server management studio - query window
Please see the image through this url http://kyxao.net/127/ExecutionProblem.png
Any ideas for this issue?
Thanks a lot
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Jan 23, 2008
Hi,I have a web application using Stored Procedure (SP). I see that there's a SP taking long time to execute. I try to capture it by Profiler Tool, and find out that with the same SP on the same db with the same parameter. The duration of executing by my web app is far bigger than the duration of executing on SQl server management studio - query windowPlease see the image attached http://kyxao.net/127/ExecutionProblem.png Any ideas for this issue?Thanks a lot Jalijack
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Oct 10, 2006
Hi all,I am facing an unusual issue here. I have a stored procedure, that return different set of result when I execute it from .NET component compare to when I execute it from SQL Management Studio. But as soon as I recompile the stored procedure, both will return the same results.This started to really annoying me, any thoughts or solution? Thanks very much guys
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Apr 25, 2001
Hi All,
I am working on SQL Server 7.0. Every weekend we go for reindexing of some tables. I want to know if it is possible to run the re-indexing of tables in parallel so that I can save time.
Our database is of size 80GB and one table is around 22GB. Rebuilding of index on this table takes a lot of time and we are unable to index the other tables.
Any solutions/suggestions are mostly appreciated.
Regards,
Mitra
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Jan 4, 2008
hi,
we currently use the Database Maintenance Plan to do backups for our SQL Server 2000 databases.
I notice that the database are backed up one after the other.
I would like to know how to run the backups in parallel rather than sequentially.
To do this, is there any dependency on the number of CPUs?
regards
Andrew
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Oct 30, 2007
Is there any way to run a stored procedure in parallel to another one? i.e. I have a stored procedure that sends an email. I then scan a table and send any unsent emails. I do not want the second part to slow the response to the user.
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Dec 6, 2001
I'd like to run 4 stored procedures in parallel on 4 different processors on our server.
Does anyone know the syntax to do that? (Could not find it on the web so far).
Anything else I need to do in addition to the specific syntax (i.e. any specific properties to set in Enterprise Manager)?
Your help is greatly appreciated!
Lana
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Apr 13, 1999
One of the developers here wants to run a PB script consisting of 11
inserts to 11 respective tables at the same time. This is on a development
box.
Currently, we are running on MSSQL 6.5 ,sp4. We have very general
parameters set, nothing special. We have max async io set to the default
The inserts run serially now. What I need to do is run them in parallel.
My questions are:
1) How do I do this -- run in parallel?
2) What parameters do I need to set?
3)What else would I need to do?
Any information you can provide will be greatly appeciated. Thanks.
David Spaisman
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Mar 19, 2014
Assuming I have a line, is there a function I can call to create a parallel line at a given distance away.i.e - with the below I would want to draw a parallel line to the one output.
DECLARE @line geometry = 'LINESTRING(1 1, 2 2, 3 3, 4 4)'
SELECT @line
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Jun 14, 2006
Hi ,I need to place the results of two different queries in the same resulttable parallel to each other.So if the result of the first query is1 122 343 45and the second query is1 342 443 98the results should be displayed as1 12 342 34 443 45 98If a union is done for both the queries , we get the results in rows.How can the above be done.Thanks in advance,vivekian
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Aug 21, 2007
Hi,All.
I'm writing test cases on C# for a few methods that make changes in database.To prevent making changes I used BeginTransaction-Rollback,everything was good.But this doesn't work if tested method has BeginTransaction-Rollback code itself.An error appears in NUnit: System.InvalidOperationException : SqlConnection does not support parallel transactions.
Do smb know how to solve the problem?
*******************************tc below********************
[Test]
[Category("Access")]
public void UpdateGroupUserTable(/*Int32 userID, GroupList dataset*/)
{
r.BeginTransaction();
try
{
r.UpdateGroupUserTable(userId,gl);
}
finally
{
r.Rollback();
}
*******************************tested method below********************
public void UpdateGroupUserTable(Int32 userID, GroupList dataset)
{
CheckDisposed();
UpdateCommand.CommandType = CommandType.Text;
UpdateCommand.Parameters.Clear();
UpdateCommand.Parameters.Add("@USERID", userID);
BeginTransaction();
try
{
Adapter.Update(dataset.acl_group);
Commit();
}
catch (SqlException)
{
Rollback();
throw;
}
}
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May 13, 2008
I have several packages within secuence containers and into one main dtsx package with a checkpoint configuration and when I run it some succeed and some don´t. The problem is that when I rerun it checkpoint doesn´t seem to work ´cause some of the successful packages are rerun as well (and not skipped as it should be...) In other words, the process does not begin on the point of failure..
Seems to be that packages that finish after the failure point (and succeed) are not registered in the checkpoint file, then when I rerun the main package these succeeded packages are rerun too....
Any ideas??
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May 11, 2007
Hello,
I have created a project to do de-dupification of addresses.
I understand that Fuzzy Grouping will take less time if it has lesser data volume to process.
My source feed file is sometimes huge. So I am splitting the input into multiple branches based on
the first letter of the city. There are 7 branches in the process.
Source File Feed
|
Split data into 7 groups
|
------------------------------------------------------------------------------------------------------------------------------------------
| | | | | | |
FzGrpg FzGrpg FzGrpg FzGrpg FzGrpg FzGrpg FzGrpg
| | | | | | |
Split Split Split Split Split Split Split
| | | | | | |
------------- -------------- -------------- -------------- -------------- -------------- --------------
| | | | | | | | | | | | | |
<- - - - - - - Write the Canonicals and Dupes from each of these splits into database - - - - - - - - ->
When I designed this I was hoping that each of the Fuzzy Grouping tasks will execute in parallel.
But in reality they are processing one after the other.
Is there anyway to make them execute in parallel?
Appreciate your help.
Thanks
KM
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Feb 24, 2015
We have a monitoring tool that find a query that is using most of execution time of all sessions on the server.
I located it, and found it is a data flow task in an SSIS package.
It export data from a table which has big mount of data to another database.
I know it only executes one time, but I see in the monitoring tool it executes 4 times.
I am wondering is it because SSIS is doing it in parallel execution automatically?
We use all default settings, and the server physical cpu is 4.
Also it says the query is slow is because it has a wait called PREEMPTIVE_OS_WAITFORSINGLEOBJECT
not sure what does that mean
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Nov 6, 2015
what the ideal CPU count and Max Degree of Parallelism are for a 3rd party database server.The server has 12 CPUs, 32GB RAM and all database sizes add up to < 30GB so they can all fit in memory (I tried to force this by doing a select * from every table). On certain payroll days, the CPU gets maxed out to 100% for a few seconds.
MAXDOP was originally set to the default 0. We later changed it to 8 based on several 'best-practices' articles. However the vendor suggests to change it to 1 (no parallelism), while others suggest changing it to 4, so that one run-away query doesn't hog most of the CPUs.
I'd like to find out how many CPUs are actually being used by queries. There is a Degree of Parallelism event in URL.... The BinaryData column says :
0x00000000, indicates a serial plan running in serial.
0x01000000, indicates a parallel plan running in serial.
>= 0x02000000 indicates a parallel plan running in parallel.- What does "parallel plan running in serial" mean ?
I see a lot of 0x01000000, and a few 0x08000000's in my trace.How can i determine whether one query is hogging CPUs and if reducing it to 4 will work?
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Jun 2, 2007
I have another post here regarding SQL 2005 running a query 50% slower than on 2000. It was discovered that 2005 runs the query in series whereas 2000 runs it in parallel.
Even with "Cost Threshold For Parallelism" set to a default value – 0, 2005 still executes my query in series. Does anyone know how to force a query to run in parallel in SQL 2005. I specifically want to set it at the database level.
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Jul 23, 2005
I have a SQL 7 db with a union query (view), and I'm getting the error, "Thequery processor could not start the necessary thread resources for parallelquery execution." This union query has been in place for about two years nowwith no problems until just now, though I haven't changed anything. Also, Ihave a local copy of the database on my machine, and the query runs fine.As noted, I haven't changed anything in the query, nor in the SQL settings.There is a network administrator, so it's possible that he may have changeda setting, but I don't know what. The query is reproduced below. Any ideasas to what's going on would be appreciated.NeilMain query:SELECT Tmp.INVCUST, Tmp.SDNBR, Tmp.SDBOOK, Tmp.SDIVCLN,Tmp.SDPAID, Tmp.SDPRICE, Tmp.SDCOPIES, Tmp.Location,INVTRY.AUTHILL1, Tmp.INVDATE, INVTRY.SaleSrc,INVTRY.HoldInitFROM (SELECT INVDATE, INVCUST, SDNBR, SDBOOK, SDIVCLN,SDPAID, SDPRICE, SDCOPIES, 'P' AS LocationFROM vwInvoiceDetUNION ALLSELECT INVDATE, INVCUST, SDNBR, SDBOOK, SDIVCLN,SDPAID, SDPRICE, SDCOPIES, 'N' AS LocationFROM vwInvoiceDetNUNION ALLSELECT INVDATE, INVCUST, SDNBR, SDBOOK, SDIVCLN,SDPAID, SDPRICE, SDCOPIES, 'M' AS LocationFROM vwInvoiceDetM) Tmp INNER JOINdbo.INVTRY ON Tmp.SDBOOK = dbo.INVTRY.[Index]vwInvoiceDet:SELECT tabInvoice.INVDATE, tabInvoice.INVCUST,SALEDET.SDNBR, SALEDET.SDBOOK, SALEDET.SDINVNUM,SALEDET.SDPRICE, SALEDET.SDPAID, SALEDET.SDCOPIES,SALEDET.SDIVCLN, tabInvoice.INVNBR, SALEDET.SDIDFROM dbo.tabInvoice INNER JOINdbo.SALEDET ONdbo.tabInvoice.INVNBR = dbo.SALEDET.SDNBR(vwInvoiceDetN and vwInvoiceDetM are similar to vwInvoiceDet.)
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Dec 9, 2005
SQL Server 2000 SP3ALast week one of our processes starting issuing or suffering deadlockdetected errors every 15 minutes or so.I have read several articles at MS on the subject. I set a couple ofstartup parameters related to producing deadlock detection informationand ran SQL Profiler. I found the SQL statements being issued by thedeadlocked statements. In every deadlock the same UPDATE statementappears however the data values being searched on are different. Thebest I can tell from trying to query the actual data each update hitsonly one or very few rows. No indexed column is updated so the indexesshould not be the source of conflict.Looking at the query I noticed that the query does not have anavailable index and Query Analyzer shows that the full table scan isbeing done in parallel.My question: Does SQL Server change or modify its locking rules whenqueries are converted to be ran using parallel processing? If so, doyou have a reference?Here is the deadlock entries posted to the error log:SPID=167ResType:LockOwner Stype:'OR' Mode: IX SPID:63 ECID:0 Ec:(0x65971510)Value:0x3c577e60 Cost:(0/0)Input Buf: Language Event: UPDATE Station_Upload setStation_Accept_Status = 'ACC',HeadStatus ='ACC',LastProcessedSta='110',HeadPartType='1' WHERE Part_Serial_No ='SCH1119323' AND Station = 'H110'SPID=63ResType:LockOwner Stype:'OR' Mode: IX SPID:167 ECID:0 Ec:(0x65801510)Value:0x3c27d060 Cost:(0/0)Input Buf: Language Event: UPDATE Station_Upload setStation_Accept_Status = 'ACC',HeadStatus ='ACC',LastProcessedSta='70',HeadPartType='1' WHERE Part_Serial_No ='SCH1119060' AND Station = 'H070'I have suggested adding an index to support the query.Any ideas?Thanks -- Mark D Powell --
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Jun 29, 2007
I have seen a number of posts regarding parallel development of SSIS packages and need some further information.
So far we have been developing SSIS packages along a single development stream and therefore have managed to avoid parallel development of our packages.
However, due to business pressures we will soon have multiple project streams running in parallel, and therefore multiple code branches, as part of that we will definitely need to redevelop the same SSIS packages in parallel. Judging from your post above and some testing we have done this is going to be a nightmare as we cannot merge the code. We can put in place processes to try and mitigate this but there are bound to be issues along the way.
Do you know whether this problem is going to be fixed? We are now using Team Foundation Server but presumably the merge algorythm used is same/similar to that of VSS and therefore very flaky?
However, not only are we having problems with the merging of the XML files, but we also use script tasks within the packages which are precompiled, as the DTSX files contain the binary objects associated with the script source code, if two developers change the same script task in isolated branches the binary is not recompiled as the merge software does not recognise this object.
Do you know whether these issues have been identified and are going to be fixed to be in line with the rest of Microsoft Configuration Managment principles of parallel development?
Many thanks.
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Apr 16, 2007
Hi,
We have a process that builds our data warehouse.
The processes execute SPs in serial order.
Each SP builds separate table.
Each table is build destructive (truncate and Insert Into).
I've tried to change the configuration by running 4 SP in parallel by SSIS to shorten the update time.
I've noticed in two declines in performance:
1. Each SP execution time is higher in the parallel execution in around 50% then in the serial execution. The CPU utilization is the same.
2. On each parallel execution we have a decline in performance of around 5 -10% compare to the previous parallel execution.
Do you have any directions to inquire?
Btw €“ we have Itanium 64bit x8 with 32GB memory
Thanks,
Assaf
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Jun 26, 2007
Hello,
I have done a search and have read some of the posts, but am left more confused than before. I am fairly new to SSIS. Here is my situation and what i am trying to accomplish.
I have a package that has a sequence container, in which there are multiple SQL tasks (about 20) running in parallel. I have checkpoints enabled, and FailPackageOnFailure enabled as well. If the package fails, when i re-run the package it will run the last task as well as all the other tasks. What I am looking to accomplish is when the package is re-run, have the SQL tasks that failed ran and not the previous successful tasks.
I think the best way would be via disabling tasks on successful completion of a task, where it writes the name of the SQL task to a temp table, but I am skeptical.
Can anyone point me in a direction to help me accomplish what I am looking for please.
Thanks in Advance.
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May 7, 2006
Hey guys. I'll try to keep this as short as possible.
Was testing out some thresholds with a simple service broker application and ran into something interesting that I'm trying to find a workaround to. I setup a simple service on a single instance, and am transmitting messages to/from the same instance. I assigned a procedure to be activated on the queue, with a max of 20 parallel activations.
The procedure originally was reading messages off the queue by following a process with major steps outlined here:
Start loop until no more messages to process
Call get conv. group with 3000 timeout into variable x
If group retrieved, receive top 1 from queue where conv_group = x
If no group, exit
Process message(s) received (simply insert some of the msg data into user table, then waitfor 1 second to simulate doing some work) for the given group
Loop to get next group and messages
So, with this type of configuration, I sent off a few thousand messages to the queue and monitored the queue count, user table count, and activated tasks count. To my surprise, despite the fact that there were thousands of messages in the queue waiting to be processed, only a single task was processing data, pulling about 1 per second.
I tried over and over with different values in the waitfor, and no additional tasks got spun up until I had a waitfor of 6 seconds or more...then only about 3-4 would get spun up at any time in parallel.
Given the way activation occurs, I thought I'd try things without the call to get conv group, and instead simply use a receive without a where clause...so, I rewrote the activation procedure to skip the call to GET CONV GROUP, and simply perform a receive without any where clause. I also removed the waitfor delay and simply left it to process messages as fast as it could...
This time, I sent over the same number of messages and checked the same counts, this time noticing that within 20 seconds or so, all 20 parallel instances of the activation procedure were processing messages off the queue, and doing so very quickly. Same occured if I put the waitfor delay back in...
The problem is, that this type of coding doesn't allow for processing related messages, even though it seems to be much better at allowing parallel activations. I tried to rewrite again using 2 types of receive statements (first one without a where clause and next one with a where clause on the conv. group from the first receive after processing the message) to see if that would allow for better parallel activation, however that worked about the same as using the GET CONV GROUP call.
So, if I have an application that mostly does not make use of grouping and want to ensure optimal parallel activation when needed, however also handle the times when related messages arrive and need to be processed together, what can I do? Any ideas?
I have test code scripts that can reproduce this behavior if needed. Thanks up front,
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Jul 25, 2007
I'm working on an SSIS package whose job it is to push data from x # of tables to x# of servers. Right now, I have it implemented with nested ForEach loops. ForEach Server loop inside of a ForEach table loop. It works great, but it will take too long as it is serial. I need a way for the inner operation to take place in parallel. In SQL 2000, the way I 'm doing this is by spawning a SQLAgent job per server. I could always do this here as well, but I'm interested in finding out if there is a way to do this with a single package.
I'm okay with process the table serially, but for each table I'd like to be able to parallel the push to the servers. Can't do it with multiple data flows because there are N # of servers being pushed to.
Hope that makes sense.
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Oct 24, 2006
Hi,
I have a master package with a sequence container with around 10 execute package tasks (for child packages), all in parallel. Checkpoints has been enabled in the master package. For the execute package tasks FailParentOnFailure is set to true and for the sequence container FailPackageOnFailure is set to true.
The problem i am facing is as follows. One of the parallel tasks fails and at the time of failure some of the parallel tasks (say set S1) are completed succesfully and few are still in execution (say set S2) which eventually complete successfully. The container fails after all the tasks complete execution and fails the package. When the package is restarted the task which failed is not executed, but the tasks in set S2 are executed.
If FailPackageOnFailure is set to true and whatever be the FailParentOnFailure value for the execute package task, in case of restart the failed package is executed but the tasks in set S2 are also executed.
Please let me know if there is any setting that only the failed task executes on restart.
Thanks in advance
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Feb 19, 2008
Scenario
I have a package that is doing some file transformation (Text, XML, and Excel) job based on a variable value. This package is called by a Parent package, where I am calling this package parallel through a script Task. So there are three parallel script task and all variables are local to script task.
In Script Task I am assigning value to child package variable using following code.
packToLaunch = appLaunch.LoadPackage("SSISPackage.dtsx", Nothing)
For iVarCtr = 0 To Dts.Variables.Count - 1
VarName = Dts.Variables(iVarCtr).Name
packToLaunch.Variables(VarName).Value = Dts.Variables(VarName).Value
Next
Dts.TaskResult = packToLaunch.Execute()
Problem1
Out of three packages some are getting failed saying variables not found in collection.
To read a variable in child package I am setting it to ReadOnlyVariables List of Script Task.
In some places I am using following code
object objValue = null;
Microsoft.SqlServer.Dts.Runtime.Variables variables = null;
if (varDispenser.Contains(variableName))
{
varDispenser.LockOneForRead(variableName, ref variables);
objValue = variables[variableName].Value;
if (variables.Locked) variables.Unlock();
}
return objValue;
Problem2
I have created a hash table in child package and stored in a package variable through a script task.
When trying to access the variable through a custom task, in some of threads it€™s returning me System.Object not System.HashTable.
Both the problems are working fine on a single processor machine, it starts giving errors on multi processor 64 bit machine.
Need Urgent Help!!!!!
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Apr 26, 2006
I have data flow tasks, one which validates the import file and one which processes the import file if the validation passed. The validation runs and pushes the three row types to three different recordset destinations. When I enter the processing data flow task, I have three parallel trees processing each recordset saved in the previous task. I'm using a script component to generate the rows which are then sorted and merged with the production database to find existing records. Based on this, I split to an OLE DB command (running an UPDATE command) or OLE DB destination (to simply insert the records.)
In this particular case, all records are being updated and nothing is being inserted new. Two of the three trees will complete the sort but hang on the merge, split, and OLE DB command components. The other will do the same but also hang on the split.
In another case, I truncated each destination table before running the package and the package runs fine.
Are toes being stepped on in the data flow task and causing a deadlock?
Update: I removed the sort transformation and sorted the rows before pushing them to the recordsets and I still get the same results.
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Oct 7, 2006
Hi,
I am facing some problem's while using the FOR loop container to execute 7-10 packages in parallel.
The main package has 7 FOR loop containers say F1-F7.
Each FOR loop container has 2 task's
T1==> exec child package C1
T2==> exec delay task Delay1.
The idea is to run child packages c1-c7 in parallel ...delay for some time and then run again since there are in the FOR loop container.
I am facing someproblems.
1. The execution of tasks T1-T7 is not guranteed. This means SSIS picks up any 6 tasks of T1-T7 randomly to start with. 6 is the max it processes whereas i have more than that. Can i change this setting???
2. Its not guranteed that if say Task t1 of FOR loop F1 is executed the subsequent task for Delay within tat For loop would be executed next. Typically wat happens is it starts with T1-T6 (T7 onhold) and then exec the delay for T1-T5 and passes control to T7 without going into the delay for T6.This is not the intended execution.
What i want is exec T1-t7 ..delay for the next exec and start again.
How do i do this.
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Nov 10, 2005
Is is possible to get the iterations in a foreach loop to run in parallel? What I need to do is to spawn an arbitrary number of parallel execution paths that all look exactly the same. The number is equal to the number of input files, which varies from time to time. Any help is appreciated!
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