Multiple Execution Paths In SSIS Control Flow

Apr 18, 2007

Hello all,



Is there documentation somewhere about multiple execution paths in SSIS control flow? I didn't find documentation anywhere. I have a situation where I have two tasks that take considerable time, but could be executed in parallel (to speed up things) and I was wondering whether SSIS supports parallelism.



To illustrate the issues in simultaneous execution, I created a test SSIS package. In the package, I have five tasks, let's call them T1, T2, T3, T4 and T5. The taks are connected with "green arrows" like this:



T1->T2

T1->T3

T2->T4

T3->T4



T5 is not connected. The tasks can be e.g. Send Mail tasks, that's not relevant to this issue. I put a breakpoint in each task and execute the package.



When I execute package, T1 and T5 become active, i.e. the arrow that displays where the package execution currently is, is in two tasks simultaneously. Now F10 (step over) doesn't seem to work "Unable to step. Not implemented". If I press F5 nothing happens. After I press F5 for a second time tasks T1 and T5 and executed. Why don't they execute with the first pressing of F5? I would additionally like to know whether these two tasks are executed in parallel or sequentially, i.e. in the same thread or in two threads? Is there documentation of this?



The execution stops at T2&T3. Again, pressing F5 doesn't do anything, but the second time I press F5 T2 and T3 are executed.





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Greetings.

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[data] [varchar] (366) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
) ON [PRIMARY]
GO

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WITH (FORMATFILE = '\l32b0021foo.fmt')

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declare @dedcode varchar(5)
declare @eeamt money
declare @eepct decimal
declare @effdt datetime

set @effdt = getdate()
set @sessionid = 'PENDING_BI'


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from #foo

OPEN Transaction_Cursor

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declare @rectype varchar(3)
declare @seqno varchar(3)
declare @data varchar(366)
declare @eeccoid varchar(6)
declare @eeceeid varchar(12)
declare @eecempno varchar(9)
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declare @type varchar(20)


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@eeccoid = eeccoid,
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and eecemplstatus = 'A'
and cmpcoid = eeccoid




CASE @RECTYPE+@SEQNO
when '001001' then goto parse_pretax
when '002001' then goto parse_LOAN
else select @RECTYPE+@SEQNO+' not recognized!'
end
process_it:
insert into foo2 (empno,companycode,amt,pct)
values (@eecempno,@companycode,@eeamt,@eepct)
FETCH NEXT FROM Transaction_Cursor into @eepssn,@rectype,@seqno,@data
END

CLOSE Transaction_Cursor
DEALLOCATE Transaction_Cursor

goto bypass

parse_pretax:
let @eepct = substring(@data,1,5)

goto process_it

parse_loan:
let @eeamt = substring(@data,27,11)
goto process_it

bypass:


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Code Snippet

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