Interested to Buy Any Domain ? << Click Here >> for more details...
Major difference between SQL override and Lookup Sql override
- 1 Answers
- 4299 Views
- I also Faced
- E-Mail Answers
Answer / ysindhureddy77@gmail.com
1. SQL Override is to limit the number of incoming rows entering the mapping pipeline
Lookup Override is to limit the number of lookup rows to avoid the whole table scan by saving the lookup time & cache it uses.
2. Lookup Override uses "Order By" clause by default
SQL Override doesn't uses it & should provide in our query if we require it.
3. SQL Override can provide any kind of join by writing the query
Lookup Override provides only Non-Equi joins
4. Lookup Override gives only one record even if it finds multiple records for a single condition
SQL Override doesn’t do that.
| Is This Answer Correct ? | 0 Yes | 0 No |
what is polling?
Differences between connected and unconnected lookup?
Which development components of informatica have the highest usage?
When do we use dynamic cache and static cache in connected and unconnected lookup transformations?
How mapping parameter and variable works
what is data modelling? what are types of modelling?In which suituation will use each one?
If you have 10 mappings designed and you need to implement some chages (may be in existing mapping or new mapping need to be designed) then how much time it takes from easier to complex?
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.
What is factless fact schema?
Why is meant by direct and indirect loading options in sessions?
If we use only lookup transformation in a mapping ie, SourceQualifier-->Lookup --> Target. , here datas are taking very long time to load in target., so what are steps to improve the performance in that mapping???????
What are different types of transformations available in informatica?
Teradata 
