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
- 7132 Views
- Tech Mahindra, I also Faced
- E-Mail Answers
Answer Posted / subhrangshu
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 |
Post New Answer View All Answers
What is the format of informatica objects in a repository?
Informatica Checkpoints
What is update strategy transform?
What is native users?
Suppose we have a source qualifier transformation that populates two target tables. How do you ensure tgt2 is loaded after tgt1?
How to update source definition?
What is the sql query overwrite in source qualifier in informatica
Write the advantages of partitioning a session?
Informatica settings are available in which file?
What is an unconnected transformation?
What are the guidelines to be followed while using union transformation?
What differs when we choose the sorted input for aggregator transformation?
Explain constraint based loading in informatica
Define filter transformation?
How to handle decimal places while importing a flatfile into informatica?
