delete all the records in a table, the speed of insertion is not change.
I have an empty table, and I insert a record need 100ms.During this table a 40,0000 trace, I insert a record need 1 s, it's ok, because I need to make a comparison according to an index before inserting a record need, so more record, more time.
The problem is when I delete all the record in this table, the insertion time is always 1s, not reduce to 100ms. Why?
Hello
Read this part of the oracle documentation
http://download.Oracle.com/docs/CD/B19306_01/server.102/b14220/logical.htm#CNCPT004
The reason is always 1s, because when you inserted 400ko record as HWM (high tide is the border between old and new space in a segment.) moved to the top. And when you remove all records of your HWM still in the same coordinate system and that you have not reset to 0. So when you insert 1 it save free space and after finding faces (usually a regular insertions got 6 steps it inserts data). If you truncate your table you and try it again it will be faster that your HWM is reset to 0.
Concerning
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