Hi,
We have one partition table which has got 30 partitions as days of month.This is a MIS report related table. We pull data from several other database into external tables.then we will pull data in temp table from external table. Then we will exchange the temp table with partition of that day.(easiest way and fast also). Now my question is. If one partition contains some data and i exchanged it with temp table what will happen to data in partition.will it append data or replace fully.
logically i think exchanging includes only data dict updates so it will fully replace. i searched on google didnt find anything convincing.

Thanks in advance

Rgds
Parag