CopyManager(In/out) vs. delete/insert directly

[Emi Lu <emilu@xxxxxxxxxxxxxxxxx>]

Hello,

Two options for data (>1M), may I know which one better please?

(1) copyOut (JDBC copyManager)
     t1 into a.csv
     delete t2 where pk.cols in t1
     copyIn t2 from a.csv

(2) setautoCommit(false);
     delete t2 where pk.cols in t1;
     insert t2 select * from t1;

Thank you
Emi