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what is incremental data aggregation?
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Incremental aggregation means applying only the captured
changes in the source to aggregate calculations in a session.
When the source changes only incrementally and if we can
capture those changes,then we can configure the session to
process only those changes.This allows informatica server to
update target table incrementally,rather than forcing it to
process the entire source and recalculate the same
calculations each time you run the session.By doing this
obviously the session performance increases.
| Is This Answer Correct ? | 7 Yes | 0 No |
Answer / shruthi
When the aggregator transformtaion executes all the output
data will get stored in the temporary location called
aggregator cache. when the next time the mapping runs the
aggreagator transformation runs for the new records loaded
after the first run. These output values will gets
incremented with the values in the aggregator cache. Thia
is called incremental aggregation. By this way we can
improve performance...
Correct me if i was wrong
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / lokesh y g
suppose yesterday 100 got inserted into target,today 50
records inserted and 25 records got updateted ,rather then
pulling all records, using incremental logic we can pull
the data only updated records and inserted records using
setmax variable ........
| Is This Answer Correct ? | 0 Yes | 0 No |
How You Pull the records on daily basis into your ETL Server.
Difference between Target-based loading and constraint-based loading?
i have two coloumn emp_no sal 1 3000 2 3000 3 3000 4 4000 5 5000 6 2700 7 4500 i just need output by removing duplicate.my answer should be emp_no sal 1 3000 2 4000 3 5000 and so on.please tel me the transformation to use and if variable is used in expression then how can i give variable expression
what is incremental data aggregation?
Consider a Phone Log table as below. It records all phone numbers that we dial in a given day. SOURCE_PHONE_NUMBER DESTINATION_PHONE_NUMBER CALL_START_DATETIME 1234 4567 01/07/2011 10:00 1234 2345 01/07/2011 11:00 1234 3456 01/07/2011 12:00 1234 3456 01/07/2011 13:00 1234 4567 01/07/2011 15:00 1222 7890 01/07/2011 10:00 1222 7680 01/07/2011 12:00 1222 2345 01/07/2011 13:00 Please provide an SQL query to display the source_phone_number and a flag where the flag needs to be set to Y if first called number and last called number are the same and N if the first called number and last called number are different. Desired Output: Source Number Is_Match 1222 N 1234 Y
Write the different tools in the workflow manager?
Performance tuning( what you did in performance tuning)
How to enter same record twice in the target table,explain?
My Source qualifier has empno, sal. Now my mapping is like SQ(EMPNO)->AGGR->EXP->TARGET SAL ------------>TARGET ? Is this mapping valid or any issues are there if we design like this?
what is the logic will you implement to load data into a fact table from n dimension tables?
How to differentiate between the active and passive transformations?
For stage table data processing, suppose in first run we processed 8 records out of 10 records then in 2nd run we should consider only not processed records (here total no of records =2) along with new records which got loaded in stage table thru real time mapping. Note : In this example, 8 records are those records for which we got transaction number after lookup on trn_no_cod table and 2 records for which lookup returns trn_no as NULL
Teradata 
