Synchronous Vs Asynchronous Outputs
Jan 3, 2008
Can someone please clarify:
If you have a data file, and you only want CERTAIN rows to pass to the destination, ie) a table
and you are using a script task to accomplish this,
is this a synchronous or asynchronous transformation?
Q. And how do you assign the values to the output? Do you have to create output columns, or not?
I am very very confused right now. I can't seem to find a decent answer to what is a very basic question either in my SSIS book or in the documenation. Perhaps it is so basic, that the question doesn't seem valid? I don't know. But I just don't understand this at all.
Thank you
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Mar 19, 2008
Porting an existing SQL 2k DTS job over to a SQL 2k5 SQL Server running SSIS.
Background:
The job loads data into an empty work table and performs some work before clearing out the work table.
This job runs every minute.
Question:
If the job happens to take longer than a minute, does SSIS create a second instance of the job?
Or perhaps it does what DTS did and reschedules the job for the next iteration?
Concern:
I need to know because there would be key contraint violations if another instance of the job started before the working table was cleared out.
Thanks in advance
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Jan 15, 2008
I'm creating a script component that reads from an OLEDB source and writes to an OLEDB destination.
For every input row, I need to output several rows.I tried using the Row.DirectRowToOutput0() method inside a loop in the
Input0_ProcessInputRow routine but that's not working. Should I be using Addrow() instead? If I use Addrow() does this mean it needs to be an asynchronous transformation?
I remember seeing a blog entry (Jamie's?) that did almost exactly what I wanted, but I can't find it now.
Any pointers appreciated
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Mar 14, 2006
If you have an output that is not synchronous with the input what is the best way of processing the data.
I am currently using a generic queue, and a custom class. I am creating an instance of the class in the ProcessINputRow and then adding it to the Queue.
The CreateNewOutputRows Dequeues the class instances and creates buffer rows.
Is there a better solution?
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Oct 22, 2007
On URL: http://technet.microsoft.com/en-us/library/ms135931.aspx among other things there is an VB example for "Creating and Configuring Output Columns" of Custom Transformation Component with Asynchronous Outputs:
Public Overrides Sub OnInputPathAttached(ByVal inputID As Integer)
Dim input As IDTSInput90 = ComponentMetaData.InputCollection.GetObjectByID(inputID)
Dim output As IDTSOutput90 = ComponentMetaData.OutputCollection(0)
Dim vInput As IDTSVirtualInput90 = input.GetVirtualInput()
For Each vCol As IDTSVirtualInputColumn90 In vInput.VirtualInputColumnCollection
Dim outCol As IDTSOutputColumn90 = output.OutputColumnCollection.New()
outCol.Name = vCol.Name
outCol.SetDataTypeProperties(vCol.DataType, vCol.Length, vCol.Precision, vCol.Scale, vCol.CodePage)
Next
End Sub
When I copy-paste given code into ScriptMain of Ascynchronous Script Transformation Component I receive error message "sub 'OnInputPathAttached' cannot be declared 'Overrides' because it does not override a sub in a base class."
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Nov 10, 2014
We are seeing high number of hadr_sync_wait types on our server after setting up AOAG during peak times. We have setup sync type as synchronous commit and failover automatic. Can we change these settings to async and manual failover whenever we need and change them back to sync commit during off peak timings. Any drawbacks because of these changes ?
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Jan 8, 2008
Hi,
Can someone explain how the PR testharness is supposed to function? When I run it f with and without debugging and by using dtexec other processes can start and stop before the awaiting response from the console date and number of days to process. If you just look at the testharness and the loadgroupfulldaily the increment date and SQL Audits will finish prematurely before the console data is even entered. Is there a property that I am missing?
Thanks,
Larry
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Apr 13, 2000
I need to send the output of a report generated, automatically through email as an attachment to some customer.Is it possible?Can anyone help?
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Nov 2, 2004
Considering email is setup, how would you send emails by scanning errorlog for any issues. Also, how to send program outputs using email.
Thanks
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Sep 24, 2007
Hi There,
I have been struggling day and night with the creation of a store procedure due to not being able to retieve the rows I need for SUM and AVG functions.
I have two tables ('actions' & 'incident_types') which both have a score value for each record. In my database, I have reports that contain both action codes and incident_type codes based on a personnel_code.
In simple terms I'm trying to do the following:-
For all reports, find each personnel member and thier attached incident_types and action codes and then, for each score from the actions and incident_types tables, create the SUM of the 'combined' scores.
I have successfully retrieved the output for the scores individually but I need the TOP(10) of the combined output.....
I'm currently using to seperate queries as follows :--
--This gives me the incident type output...... Creating the 'Volume' column which is the total Score for incidetn_types
SELECT Top (@Number) Personnel_details.personnel_code, Personnel_details.personnel_forename, Personnel_details.personnel_Surname, sum(incident_types.type_score) as 'Volume', avg(incident_types.type_score) as 'Average' INTO 'Incident_Scores' from Report_header
JOIN incident_types on incident_types.type_code = report_header.report_incident_Code
JOIN report_basedon on report_basedon.report_code = report_header.report_code
JOIN personnel_details on personnel_details.personnel_code = report_basedon.personnel_code
WHERE (report_header.report_date >= @fromDate and report_header.report_date <= @toDate)
AND (report_header.report_time >= @fromTime and report_header.report_time <= @toTime)
AND report_basedon.personnel_code <> 0
AND report_header.record_status=@recordStatus
group by Personnel_details.personnel_code, Personnel_details.personnel_forename, Personnel_details.personnel_Surname
-- I then use the following to get the total of all action scores, again in the 'Volume' column
SELECT Top (@Number) Personnel_details.personnel_code, Personnel_details.personnel_forename, Personnel_details.personnel_Surname, sum(actions.action_score) as 'Volume', AVG(actions.action_score) as 'Average' from profile
JOIN actions on actions.action_code = profile.action_code
JOIN report_header on report_header.report_code = profile.incident_ID
JOIN personnel_details on personnel_details.personnel_code = profile.personnel_code
WHERE (report_header.report_date >= @fromDate and report_header.report_date <= @toDate)
AND (report_header.report_time >= @fromTime and report_header.report_time <= @toTime)
AND personnel_details.personnel_code <> 0
AND report_header.record_status=@recordStatus
AND profile.record_status=@recordStatus
group by Personnel_details.personnel_code, Personnel_details.personnel_forename, Personnel_details.personnel_Surname
So my question is - How can I get the sum(incident_types.type_score) + sum(actions.action_score) and then get the TOP(10) rows?
Is it possible to output these 2 result to a new table and then join the new tables?
Thanks for any assistance, this is really draining me at the moment..... :-/
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Jan 5, 2008
The following statement is from Microsoft documentation:
If you use the ExclusionGroup property to specify that rows should only go to one or another of a group of outputs, as in the Conditional Split transformation, you must call the DirectRow method to select the appropriate destination for each row. When you have an error output, you must call DirectErrorRow to send rows with problems to the error output instead of the default output.
I have a question about this because I have never used the "ExclusionGroup" property. For example, I have a script component where I specify 4 separate outputs, because I am sending different groups of rows to each output. I accomplish this programmatically using a lot of conditionals and it works fine.
I did not have to use the "ExclusionGroup" property to do this. So I'm not sure why I would ever need this, or to use DirectRow? I'm trying to understand this better, because maybe I feel like I'm not understanding the DirectRow, or how/when to use it.
Thanks
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Mar 19, 2004
I have a stored procedure that I just need to return the output to my program.It is a Select All type statement.I will post my vb code that works when I use both inputs and outputs but not for all output procedure...I dont get it.
Here is the Stored Procedure.....
CREATE procedure dbo.IDXAppt_Settings_NET
(
@SQLADD nvarchar(15)Output,
@SQLDatabase nvarchar(20)Output,
@SQLLogin nvarchar(20)Output,
@SQLPass nvarchar(20)Output
)
as
select
@SQLADD=SQLAddress,
@SQLDatabase=SQLDatabase,
@SQLLogin=SQLLogin,
@SQLPass=SQLPassword
from
Clinic_Settings
GO
Here is the Vb.Net Code........
To retrieve the elements that does not give me an error just gives me no data....
Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim consql As New SqlConnection("server=myserver,database=APPOINTMENTS;uid=webtest;pwd=webtest")
Dim cmdsql As New SqlCommand
Dim parmSQLAddress As SqlParameter
Dim parmDatabase As SqlParameter
Dim parmLogin As SqlParameter
Dim parmSqlPass As SqlParameter
Dim strtest As String
Dim db As String
Dim login As String
Dim pass As String
cmdsql = New SqlCommand("Appt_Settings_NET", consql)
cmdsql.CommandType = CommandType.StoredProcedure
parmDatabase = cmdsql.Parameters.Add("@SQLData", SqlDbType.NVarChar)
parmDatabase.Size = 20
parmDatabase.Direction = ParameterDirection.Output
db = cmdsql.Parameters("@SQLData").Value
parmLogin = cmdsql.Parameters.Add("@SQLLogin", SqlDbType.NVarChar)
parmLogin.Size = 20
parmLogin.Direction = ParameterDirection.Output
login = cmdsql.Parameters("@SQLLogin").Value
parmSqlPass = cmdsql.Parameters.Add("@SQLPass", SqlDbType.NVarChar)
parmSqlPass.Size = 20
parmSqlPass.Direction = ParameterDirection.Output
pass = cmdsql.Parameters("@SQLPass").Value
parmSQLAddress = cmdsql.Parameters.Add("@SQLADD", SqlDbType.NVarChar)
parmSQLAddress.Size = 15
parmSQLAddress.Direction = ParameterDirection.Output
strtest = cmdsql.Parameters("@SQLADD").Value
consql.Open()
cmdsql.ExecuteNonQuery()
Label1.Text = strtest
End Sub
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Oct 12, 2004
Hi everyone!
I have an stordprocedure that returns a resultset , an output value and an return value.
I invoked this procedure using an sqlcommand object ( by ExecudeReader method ) and I filled a SqlDataReader object by the resultset.
dr = cmd.ExecudeReader();
but I cant reach its output variable and its return value (cmd.parameters["@ret"].value).
an exception raises : object refrence error!
what is wrong in this approach ?
please help me.
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Nov 30, 2014
Obviously Excel is the tool of choice for most people but with it's limited ability to leverage RAM (32 bit) and it's limitation with rows at just over 1 million what other choices do we have for viewing data?
My bosses boss created several OLAP universes and they seems to fly a lot fast than regular relational database. This still doesn't work with the fact the data can't be worked with unless you have a strong front end that can handle processing all those rows.
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Jul 22, 2015
I have a table with email addresses and CC_Flag.
Email    | CC_Flag
xxxx          0
yyyy          1
zzzz          1
Using Task SQL, I am trying to pass these email addresses to two separate variables - To_field, Cc_field on basis of the CC_Flag. Is it possible to fill two variables from a single SQl Task.
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Apr 11, 2007
Hello, I am using a multicast with 5 outputs, I attempting to pass about four thousand rows to different destinations. However, upon execution only two of the outputs send the rows to the destination. After deleting the multicast and reinserting it, different destinations received the data. The number of destinations is also not consistant, sometimes 3 work and sometimes only 1 works.
Thank you.
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Mar 13, 2007
Hi,
SQL Server 2005, sp2
What I am trying to do is very simple. I just want to run 2 stored procedures, then have the output from both sp's written to a single file.
I created a Data Flow task, then put 2 OLE DB Source adapters in the Data Flow task, one for each stored procedure.
Next, I dropped a Flat File destination object onto the page. However, I can only connect ONE arrow from one of the OLE DB Source adapters to the Flat File destination. It won't let me connect both.
What am I doing wrong here? How can I accomplish what I am trying to do here?
Thanks much
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Sep 25, 2006
Hi,
I wonder if someone might be able to help me with scripting a script component. I'd like to include error redirection of rows within my script.
If the conversion of any of my inputs fail i'd like to catch the error and then just output all values to another output path. The output path will just take the input values without converting them from string data types and output them to an error table.
In the script i imagine i would use try catch statements and if it fails then set the output. I am not entirely sue as to how to go about switching between outputs though.
Any help on this matter would be greatfully recieved.
Cheers,
Grant
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Oct 1, 2007
I'm new to SSB, so please bear with me. Our application requirements are:
1) Web app gathers user input from a web UI.
2) Web app calls a stored procedure, passing in the user input gathered in step (1).
3) Procedure issues queries to multiple data sources (SQL Server 2005 db's) derived from the user input.
4) Procedure waits for replies from these multiple data sources, governed by a timeout in case a data source is unavailable or slow to respond.
5) Procedure aggregates the data returned in step (4) from multiple data sources into an XML document.
6) Procedure returns the XML document as an output parameter.
This is different than the usual SSB asynchronous application paradigm. In particular, I'm wondering:
How can I setup a synchronous dialog, where the procedure that issues the SEND waits for a reply from the target service? I don't want the initiator procedure to end after SENDing, but rather wait for the replies to those messages so it can aggregate the data from the reply message bodies.
Thanks - Dana Reed
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Sep 25, 2006
HI, I need to know whether I am on the last row or not in my script component. If this is the case, I would alter a column in the row that indicates me that I am processing the last row. Is there a way to do it? I tried with process input but when the EndOfRowSet() indicates me that the last row is porcessed, I cannot alter the row in the buffer.
Thank you,
Ccote
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Aug 21, 2007
Can someone please point me to one or more examples of a Source component that has two or more outputs?
I wrote a source, which works with a single output, but after adding a second output, I see no rows there. I've single-stepped the code in the debugger, and it looks like it should be adding rows to the second output, but the downstream component never sees any.
Thanks.
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May 24, 2007
Hi guys,in my db i have these three tables1.Stores 2.Products3.Partstheir structure is something like :Stores ----Products ----PartsStores----------------StoreId, StoreNameProducts----------------ProductId, StoreId, ProductNameParts----------------PartId, ProductId, PartNamenow, in my application i wanna to implement a bulk-copy operation souser can copy products from one store to another one and when aproduct copied to new store;all of it's parts should copy too.in fact i need a method to insert a Product item in Products table andsynchronously copy it's parts into Parts table and repeat this stepsuntil all of proucts copied.how can i do that without cursors or loops ?Thanks
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May 13, 2006
I have synchronous mirroring. Some times I loose connection to witness and mirror servers. These times primary server is down. Is there any way I can change mirroring to asynchronous when primary server is down due to communication break down between witness and mirrored servers? I can break mirroring but to re-establish mirroring, I have to backup and restore on the other side. So if I can change mirroring to asynchronous when primary server is down due to connection breakdown between witness and mirrored server, then when witness and mirror servers come back, I don't need to restore the entire database. Ofcourse I could use asynchronous always but that does not failover automatically. I am thankful to all answers and suggestions. Thanks.
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Aug 30, 2006
hi there
I am using SQL SERVER 2005.
I am creating a Merge replication(between two databses), its working well, but i need to goto the Local publications & right click there & select the "View Synchronization Status" & then start the Agent manually to Synchronous the databases.
Now I want the Two databses should be replication (Merge) automatically without going to any menu.
I mean the Synchronization takes place when any of the Databases changes, automatically, without touching anything.
For Example:
If one record is inserted in a table(on commit) of Database ONE, it should be Reflected to the other table of the database TWO.
Any Idea, or Link or solution???
Gurpreet S. Gill
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Jun 8, 2006
Hi
I'd like to know if there's a way to control the execution of ETL packages, such that:
Different packages, or at least packages that don't access the same table or database run asynchronously with respect to each other; e.g., two different packages run at the same time
and
If a package is called for execution more than once by different requests, force them to run synchronously, or one after the other.If this is possible, what resources would it require? Is this possible under, say, a dual or quad processor machine?
Thanks.
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Mar 13, 2006
Hi
I am currently trying to write a custom transform componet in c# that will take a row of data, perform a look-up via an external system,
then if there is a match then send the data from the extranel system down macth ouptut (which will have different columns to the input) and drop the data that
was read, else send the data down the unmacthed output which will be the same as the input.
So I would like to write a synchrons transform becuase I don't need read all the rows from the input buffer before I started processing, also I wish have millions of rows
load in memory.
Can this be done? also does any have explame code of how to do this? becuse I can't see how to send data down the match output buffer,
as this will have the lookup results data which will have diffent columns to the input data and how disgard the input data as well.
Thanks Steve
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Apr 2, 2007
Hi,
Can anyone please point me in the right direction?
What I am trying to do should be very straightforward:
Take a flat file, perform various transformation on various columns using the SCRIPT COMPONENT task, then send the transformed (and un-transformed) rows to a table in the database.
My question is, how to do this using scripting? I have yet to see an example of what I'm trying to do. (I have both Kirk Haselden's book, Donald Farmer's SSIS scripting book, and the msdn website, but I have yet to see an example of what I'm trying to do!)
FILE SOURCE --> SCRIPT COMPONENT (synchronous transform) --> OLE DB DESTINATION
How do I account for all the columns that will be both transformed and un-transformed, and get them into the table? That is the missing piece of information I can't find anywhere.
The closest thing I found was this code snippet. Do I need to use this syntax, eg. Me.Output0Buffer.FirstName = (where FirstName is the actual column name??)
etc.
Then, once I hook up the SCRIPT COMPONENT to the OLEDB Destination, which uses a connection manager to the table, it will insert FirstName with what I specify?
Help. Thanks.
Me.Output0Buffer.AddRow()
Me.Output0Buffer.FirstName = columnValue (or whatever)
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Mar 8, 2015
I am trying to implement a read only replica to move much of the data read for an application to the secondary replica. Initially I had the the primary and secondary set to asynchronous commit. QA brought up an issue with creating entities from the application because after the creation of an entity the application turns around and repopulates the entire aggregate object. Well it seems that the application was reading the secondary replica before the data had been committed. Although I understand the issues that synchronous commits can cause, I went ahead and made the change as I expected it to fix the issue. After changing the primary replica to synchronous we still had the error, so I also changed the secondary although that makes no since, but the issue remains.
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Nov 21, 2006
Wanted to enquire how this is done. Tried doing it in the setUsageType method I have overwritten but only allows description to be changed. Basically need to change "Name".
Best option would be to change it instantly when a user selects a column from the inputs in the custom component, ie. it changes the Output Alias to a desired value. (Input tab in advanced editor)
All this is being done in a custom component which I would like to be synchronous, can achieve a similar result asynchronously.
Thanks
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Mar 27, 2007
Hello :
I have a Web application with reports which lasts for a long time, for it I reflected to make call Asynchronous for reports
(that is I execute the report and warned the user when the report is ready).
I found an example which supplied with SQL Server, but as I am novice C# I understands not everything in the example
( AsynchronousRenderCS).
Please indicate me a simpler example.
Thank you.
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Apr 23, 2008
I have a package with 10 synchronous dataflows, which, combined, load about 300MB of flat file data to a database. This package would run successfully on 2 of our database servers, but would regularly fail on a third. The server on which it was failing is a 4 processor box with 16GB Ram with Windows Server 2003, SQL 2005, SSIS and SSRS installed - much more robust than one of the others that the package worked on. The SSIS error messages returned alternated between the following (with no apparent reason why one would show up rather than another, though the first was the most common):
"The file name "\Server1Folder1File1.txt" specified in the connection was not valid."
"The file name property is not valid. The file name is a device or contains invalid characters."
"An error occurred while initializing the flat file parser."
For the first error message, the error would report different connection managers and their associated file as invalid from run to run. All of the files across the 10 dataflows resided in the same network folder, and the package would read in and process a few of them before failing, so the problem was definitely not the connection string.
Searching the forums, etc. for these errors provided no useful information - given the real cause of the problem, these error messages are worse than unhelpful, they send you looking in the wrong direction. It was only when trying to track down another problem on the same server that I discovered the issue. When trying to copy database backups greater than 12GB over the network to this server, the operation would fail with an "Insufficient System Resources" message.
Some research led to the discovery that problem was caused by the /3GB switch in the boot.ini file of the server (don't let your Server team use that switch if you have 16GB of memory or more). Removing the switch and setting SQL to utilize AWE, fixed both the file copy problem AND the SSIS package failure problem. The SSIS package failed, not due to a bad connection string, but rather to insufficient server resources (read memory) to handle the simultaneous connections.
I hope this may help any others trying to track down this kind of SSIS package failure.
I will also provide here what I have gleaned about setting up Memory usage for SQL Server 2005 running on 32 bit Windows Server 2003 (with the caveat that I am no expert €“ corrections and additional information are welcome).
The following links got me started in my research (thanks to the folks who provided such useful information):
http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=55191
http://articles.techrepublic.com.com/5100-10878_11-6091280.html
http://www.simple-talk.com/community/blogs/brian_donahue/archive/2007/09/30/37747.aspx
http://blogs.technet.com/askperf/archive/2007/03/23/memory-management-demystifying-3gb.aspx
http://www.modhul.com/2007/11/10/optimising-system-memory-for-sql-server-part-i/
Also, search BOL for:
Server Memory Options
Enabling Memory Support for Over 4 GB of Physical Memory
Enabling AWE Memory for SQL Server
Windows Server 2003 provides access to 4GB of virtual address space. By default, 2GB is assigned to the OS and 2GB to applications. This default can be change to 1GB for the OS and 3GB for applications by the use of the /3GB switch in the boot.ini file.
Physical memory over 4GB can be addressed by enabling Physical Addressing Extensions (PAE), which is done by setting the /PAE switch in the boot.ini file. This does not increase the systems virtual address space, rather it increases the size of the page table (which is maintained within the virtual address space), adding entries to reference the physical memory above 4GB.
It is important to note that these two switches are not interdependent (they do different things and you can turn each on or off regardless of the others status), though the combination of them has an impact on server performance and the maximum amount of physical memory which can be addressed.
The /3GB switch only impacts the allocation of the first 4GB of memory (virtual address space) between the OS and applications (default 50/50 % split, with switch on - 25% OS and 75% applications). The /PAE switch enables the system to reference/manage physical memory above 4GB, but does not alter the allocation percentages of the first 4GB of memory between the OS and applications. However, when PAE is enabled, the OS requires more memory within the first 4GB to manage the physical memory above 4GB (due to increased page table entries). With the /3GB switch, the OS has only 1GB of virtual address space, and only enough space to manage a total of 16GB of physical memory. If 32GB of physical memory is installed, 16GB of it will go to waste.
Address Windowing Extensions (AWE) is an API that allows an application to address more than the 2-3GB of memory that is available to applications within the virtual address space (first 4GB of memory). SQL Server can utilize AWE to take advantage of memory above the first 4GB that is made available via PAE, and can even reserve portions for its own use. I believe (though I can€™t remember where I got this bit) that SQL utilizes AWE memory only for the page cache (buffer pool €“ which seems to be a misnomer), and not for other operations.
To enable AWE, see the BOL references above.
The big question: what are the recommended settings for all of these? That all depends on what you have running on the server. You need to leave space for the OS, SQL Server and any other applications you have.
The hard and fast rules:
If you have more than 4GB of RAM, you must use the /PAE switch in order to take advantage of it.
If you have more than 16GB of RAM, you must NOT use the /3GB switch in order to take advantage of it.
Based on anecdotal evidence, I€™ve noticed the following generally recommended guidelines €“ assuming the server is dedicated to SQL.
Use of the /3GB switch seems to be a generally accepted practice if you have 8GB of RAM or less. For between 8 and 16GB, some say never use the /3GB switch, others say you can use it up to 12GB and still others up to 16GB. I interpret this to mean that it all depends on what types of loads are being placed on the server and that testing on individual servers will be required to determine whether or not to use the switch. Certainly that was my experience - the /3GB switch worked fine with 16GB RAM, until the server encountered a certain workload. For me, no more /3GB switch.
For setting SQL to use AWE, most seem to agree that it should be enabled if you have more than 4GB RAM. The setting of max server memory is more complicated. BOL seems to suggest (the €˜Server Memory Options€™ entry) a formula of Total Physical Memory minus 1-2GB for the operating system. Based on a desire to be a bit more conservative, I am now using the following formula:
max server memory = total physical memory
minus
4GB for the OS and application processes (since the AWE memory is utilized for page cache, not SQL processes)
minus
AWE memory required by other applications, including other instance of SQL Server
If anyone has additional insight, or a more refined equation, I could certainly benefit from it.
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Apr 8, 1999
Hi all,
Can anybody tell me if the have had any luck on creating and processing asychronous cursors. According to Microsoft SQL 7.0 books online after you create your Async cursor and then display the variable @@cursor_rows it should display either a negative number like -1245 meaning that it is still loading or a whole number meaning that it finish loading, but every time I display this variable I get -1 and according to MSSQL documentation this means I'm creating a Synchronous cursor, I have modified the cursor threshold settings, declared my cursor INSENSITIVE, and still can't get a cursor to be Async.
Thanks
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Mar 21, 2007
What I am looking to do is have a stored procedure begin a dialog with my request service.
With that dialog established my stored procedure sends 50 request messages, one for each of the 50 of the United States. I want these to be processed asynchronously by a procedure that is called on activation for the request queue. In that activation procedure the request is processed against the respective state and a response message is sent to the response service (to the response queue). I want to be able to tie these request messages and response messages together with some type of shared identifier. These requests don't need to be processed in any specific order and don't need any fancy locking mechanism via conversation group since these requests require to be processed asynchronously. What is the best approach? Do I need to create 50 seperate queues and open dialogs with each? If this is the route to take, would this be a performance hit?
My goal is to have all 50 states process all at once, each finishing with a response message sent to the response queue. The initiating procedure, after sending these 50 requests, would then spin and wait for all 50 to complete, be it a response, error, or timeout. When all 50 have returned, the procedure would then merge the results and return. So as you can see in my scenario, I dont care when a state is complete as they do not affect the outcome, nor do they access any of the same resources when being processed.
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