Hi
I have been asked several times the following questions.
1.How does one do incremnental loading
2.Scenario - You are trying to load reasonable amount of
rows into the target table, and its taking a helluva lot of
time.What could be the reasons?
I hate to answer these tw0 , gives me nightmares to even
think of it!!!
3.Tell me any complex situation you have faced( as an
Informatica Developer) and how did you resolve it.
4.tell me any complex mapping that you have done.
All the experienced people out there , please please, reply
to these questions.
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Answer / chiky
How does one do incremnental loading
CHECK OUT THE OPTION, truncate target table option in
sesson==> target properties.
this makes the incremental load.
Scenario - You are trying to load reasonable amount of
rows into the target table, and its taking a helluva lot of
time.What could be the reasons?
use bulk loading in session properties.
use less record as master table in joiner
use filter in first of the mappings
dont use unwanted columns in source qualifier.. better use
SQL overriding.
use dynamic lookup only if in use.
tune your query what ever reads from db.
use partitioning of table if records are huge in number.
3.Tell me any complex situation you have faced( as an
Informatica Developer) and how did you resolve it.
4.tell me any complex mapping that you have done.
AM not enough experienced to answer this two questions.
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Answer / abhinaw prakash
Answer
1.We can do incremental loading by clicking on the check box inside Aggrgator T/R.Use filter transformation before Aggrgator to filter out rows and pass only the changed records to the flow.
2.One of the reasons could be the time its taking to build caches.to answer this more details of the maping is required.
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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
what is incremental loading ?
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