Interested to Buy Any Domain ? << Click Here >> for more details...
generate Unique sequence numbers for each partition in session with Unconnected Lookup ?
Hi All,
Please help me to resolve the below issue while Applying partitioning concept to my Session.
This is a very simple mapping with Source, Lookup , router, and target.
I need to Lookup on the target and compare with the source data, if any piece of data is new then Insert, and If any thing change in the existed data then Update.
while Inserting the new records to the target table I'm generating sequence numbers with Unconnected lookup, by calling the maximum PK ID from the target table.
The above flow is working fine from last one year.
Now I wish to apply the Partitioning concept to the above floe(session)
At source I used 4 pass through partitions.(For Each partition different filter conditions to pull the data from source)
at Target I used 4 passthrough Partitions.
it is working fine for some data, but for some rows for Insert Operation , it is throwing Unique key errors, because while Inserting the data it is generating the same sequence key twice.
In detail : 1st row is coming from 1st partition and generated the sequence number 1 for that row.
2nd row is coming from 1st partition and generated the sequence number 2 for that row
3rd row is coming from the 2nd partition generated the sequence number 2 again for that row. (it must generate 3 for this row)
the issue is becuase of generating the same sequence numbers twice for different partitions.
Can any one Please help me to resolve this issue.
While Applying partitions how can I generate a Unique Sequence numbers from Unconnected lookup for Each partitioned data.
Regrads,
N Kiran.
- 2 Answers
- 7003 Views
- Tech Mahindra, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / sufi
Most simple way to handle this type scenario is use DB Sequence Generator (write Stored Procedure) and Trigger on INSERT on top of it.
| Is This Answer Correct ? | 2 Yes | 0 No |
Hi,
Take one parameter (i.e. $$seq) and assign initial value for the unique key (i.e. 1000). Now, from Source Qualifier take all the ports to one expression transformation. Add two additional ports in the Expression Transformation as below.
v_seq (variable port) = IIF(v_seq>0,v_seq+1,$$seq)
SEQ_NO (output port) = v_seq
In this way, the Sequence transformation can be avoided but we will have the same facility in partition scenario as we are changing the port values only.
Though I believe it will work but please let me know if it is not.
| Is This Answer Correct ? | 0 Yes | 0 No |
How can we use mapping variables in informatica?
Can we create out put ports in source qualifier t/r?
Difference between session variables and workflow variables?
Generally how many Fact Tables and Dimensions Table you have used in the Project? Which one is loaded first Fact Table or Dimensions Table into the warehouse? What is the size of the Fact Table and Dimension Table? what is the size of the table and warehouse
Please let me know how we can implement the below scenario. In a single mapping,more than 500 sources (legacy,VSAM,relational) will be loading into only one target. Whenever I retreive the data(any record) from target, i need to find the details that the record belongs to which source. Thanks in advance..
i have a data in my source as a flat files what test i have to perform the next step can any body help to me
My i/p is like below 1,2,3,4,5,6,7,8,9,10....100 I want that to be populated in two o/p as below o/p-1: 10,20,30,40,50,60,70,90... o/p-2: 11,21,31,41,51,61,71,81,91.... How to do it in ingotmatica...
How can we reset Sequence Generator, when we move objects from Dev Environment to QA env?
what is informatica metadata?
in realtime which situations u can use unconnected lookup transformation
Performance wise which is better joiner or look up ? Give me with example?
when do we use static cache and when do we use dynamic cache in lookup transformation? with example.
Teradata 
