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 Fast copying of Oracle table data Tips

Oracle Database Tips by Donald BurlesonMarch 23, 2015

Question:  What is the fastest way to copy Oracle data from one table to another table? 

Answer:  You can use many tricks to make a faster copy of Oracle data using CTAS:

  • Use NOLOGGING:  This turns off logging, making for a faster copy.  However, if you must recover, you will not be able to roll-forward through this operation.
  • Use the parallel clause:  Since a table copy does a full table scan of both tables, parallel query will make the copying far faster, (up to cpu_count-1 faster).

In this example we fast copy data from one table to another table on a 16 CPU server:

create table
   newtab
parallel 15 nologging
as
select /*+parallel(source 15) */ *
from
   oldtab;

Also see these notes on fast copying of Oracle tables/schemas:

   
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