Insertion of data after creating index on empty table or creating unique index after inserting data on oracle?

Question

Which option is better and faster? Insertion of data after creating index on empty table or creating unique index after inserting data. I have around 10M rows to insert. W

Answer 1

As others have said, insert first and add the index later. If the table already exists and you have to insert a pile of data like this, drop all indexes and constraints, insert the data, then re-apply first your indexes and then your constraints. You'll certainly want to do intermediate commits to help preclude the possibility that you'll run out of rollback segment space or something similar. If you're inserting this much data it might prove useful to look at using SQL*Loader to save yourself time and aggravation.

I hope this helps.