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performance tunning sql insert - challenging one

Posted on 2016-10-07
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Last Modified: 2016-10-07
I have an insert statement which is  used to insert around 9 million records, I want your guidance in tunning this process. Which is better a plsql procedure or insert statement

INSERT /* + append */ into consumer
Select *
from tmp_consumers  b
where  not exists (select 1 from consumerdata c
                                where c.prodcode=b.prodcode
                                and c.city=b.city)
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Question by:sam_2012
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sdstuber earned 500 total points
ID: 41834346
sql statement alone is better.

using pl/sql  you'll have to the same sql to perform the insert and select, but on top of that, you have the pl/sql overhead itself.

thing about it this way - you can perform step A, or you can perform step A + step B
No matter how small B is (unless 0, which is impossible) A alone will always be faster.


as a side note - please don't tag the questions "challenging" it's just extra characters that don't really add value in describing the problem.
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Author Closing Comment

by:sam_2012
ID: 41834433
awesome.
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