How Oracle quickly inserts 10 million of data

1. Use dual with Connect by level

Create Table  as Select  as ID  from  by Level<=100000;

However, there is a limit of connect by level, if exceeding the limit, the system will report, "Connect by Level" Memory is not enough, I tried 10 billion data can, but no more.

2, using XMLTable, "CONNECT by operation Memory is not enough, 10g began to support XML, changed to XMLTable can be", the code is as follows:

Create Table  as Select  as  from xmltable ('1 to 10000000');

ok,1000 Data Perfect Insertion

How Oracle quickly inserts 10 million of data