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Sequential Fle Stage

In: Business and Management

Submitted By Ipsita88
Words 434
Pages 2
Sequential file stage:
It can have 1 output link and can support only 1 reject link

Transformer stage
Processing stage
Most commonly used whenever we hv multiple function instead of using multiple stage we can use a trf
It has single input link and multiple output link, out of this output (upto 124) it can have only 1 reject link. I can convert those output link to reference link and can do lookup with that
Its imp as we can p
We can copy () write to multiple outpiut ---what copy does
Can do lookup()as we have reference
, can do sort
Can perform remove duplicate
Can do aggregate
Can do pivot
In modify we can do data type conversion so as in trf

Trf is not good always to use.we should not use trf for evdery minor transaction coz, trf at the backend runs the C++ compiler.whenever we use trf, it ginaa call all the C++ operators at the backend even though we do not use it.
But if we want to hande more than 1 function then we should use trf instead of using multiple stage

Order of execution in trf
Stage variableloopconstraint and derivation constraint is on table and derivation is field level(specific col)
Legacy null processing---it means tryimg to revert back to th previous versions.chossing the previous version null handlingprevious version of null handling is ----befor 8.5, the design of job should explicitly handle null value when any col is used for derivation whereas in 8.5 it is handled automatically.
For eg: in previous version of 8.5, if we have to derive a col by Sal +100 --if sal contains a value, then it ll add 100 to the value and give it to the result, but if sal is null,then it ll reject the rec if reject link is provided or it will drop the record. To avoid this, we will have to write some condition to handl the nulls in the sal col.
In 8.5 version,
If the sal is null then also it will pass record to the output. we need not have to handle it explicitly.
With this also we have sm issue, then they introduce an environment handling apt transform compline old null handling is added to the parameter set.


Whenever trf encounters null value, it abort the job
If both the things are checked…then it ll abort the job
Max reject log---if -1 is specified, then unlimited warnings are written to the log.max 50 warnings can b written in a partition.…...

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