Trigger or sql statments to trim spaces??

Dears,
I am receiving some data in some kind of stagging tables with some columns having extra spaces ... so is it faster and / or better to create a trigger on those tables to trim those spaces before insert or shall i trim when retrieving data from those tables?? note that this data will not be retrieved more than two times as its part of migration process.
Thanks in advance,
Swaid McKey

How did you perform the import? imp <username>/<password>@<ORACLE_SID> fromuser=<srcusername> touser=<destusername> file=<dumpfilename> tables='<tablename>' log=<logfilename> BUFFER=2048000 RECORDLENGTH=64000
Where did the source dump file come from? if i got u right from informix dynamic server (src) to oracle 9i (intermediate) then to oracle 9i (stagging)
How did you "processing and moving data to final destination"? with pl/sql procedures selecting from stagging inserting into dist with updates in the middle.
How did you "updating the the table by trimming the> column"? update emp
set name=rtrim(name);
How many tables are we talking about? 13 table
How many columns need to be trimmed? 1 to 2 columns per table
How many rows are there? as i said before 11million
How did you take these timings?using shell script, i record the time before & after.
How did you write hte migration?cursor --> open --> loop --> fetch --> inserts --> updates --> end loop
Why are you going via a dump file to do the migration?because of the agreement with the other party
Why are you using staging tables? Are you performing other transforms on the staging tables?i only query from them but i do transform the data before inserting in the destination
Where are the spaces? leading or trailing? or both?trailing
what are the data types?VARCHAR2 (20)
Are there object types involved?no
Do the target tables already have triggers on them for other reasons?no

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