"Create Table from select Query" Vs "Insert into"
Hi
Schenaio:
My Select Query returns more than 10 million records, these records needs to be inserted into another table.
Approach 1:
I created table called TABLE1, and inserted the records using INSERT statement as a batch (batch size is 5000).
Approach 2:
I create table like,
CREATE TABLE TABLE1 AS <SELECT QUERY>
Here Apporach-1 took almost 40 minutes to complete the insert but Approach-2 took only 6 minutes.
If anybody knows why it is? And is there any way to improve the performance of Approach-1?.
Thanks
Nidhi