Delete all record in a table, the insert speed is not change.

I have an empty table, and i insert a record need 100ms,
when this table has 40,0000 record, i insert a record need 1s, this is ok, because i need do a compare based an index before insert a record, so more record, need more time.
The problem is when i delete all record in this table, the insert time is still 1s, not reduce to 100ms.Why?

Hello,
Read through this portion of oracle documentation
http://download.oracle.com/docs/cd/B19306_01/server.102/b14220/logical.htm#CNCPT004
The reason is still taking 1s, because when you inserted 400K record because HWM (The high water mark is the boundary between used and unused space in a segment.) moved up. And when you deleted all the records your HWM still at the same marker and didn't get to reset to 0. So when you insert 1 record it lookings for free space and after finding (generally a regular inserts got 6 steps it inserts data). If you truncate your table you and try it again it will be faster as your HWM is reset to 0.
Regards

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