If we use only lookup transformation in a mapping ie, SourceQualifier-->Loo

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???????

Question Posted / moorthi_cs

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If we use only lookup transformation in a mapping ie, SourceQualifier-->Lookup --> Target. ,..

Answer / hari

use order by clause in source qualifier.
Remove un necessary ports in that lookup.
try to restrict lookup cache based on the source data.
create order by clause in lookup override using the lookup
condition columns.
If lookup and source are in same database try to join in
source qualifier.
Drop the indiex on the target table before loading the data.
Check index on source table,
Check source table look tables are analysed properly or not.

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If we use only lookup transformation in a mapping ie, SourceQualifier-->Lookup --> Target. ,..

Answer / murali udayagiri

One more point we can add to the first answer.
i.e
Check lookup condition columns are having indexes or not.
If indexes are present check when those are rebuild.Index
snaps are old then rebuild them before going to be start
session.If indexes are not present on conditional columns
just create.

Please let me know if any issues.

Thanks,
Murali Udayagiri

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