There will be decreasing performance of oracle by delete whole table and then insert...

There is a project that need collecting periodically (2 months) data into one table and then exporting it as excel file. The table is a temporary table, the app do that

Delete from tb_name; insert into tb_name values .....

With that method, it wocould be causing more and more tablespace fragments, and make the performance decresing.

In other to avoid this disadvantage influences, I suggest programer modify the app

Truncate table tb_name drop storage; insert into tb_name select * from...

The delete operation will be causing tablespace fragments.