Partition merge for huge data

Question

The application has a very large table with more than 5 billion data , using that table it is planned to have only some years data by doing this it is expected to reduce 20 to 25 % data reduced.
The problem here is as it is very large table we plan to get the required data in partition and plan to have this partition merged in to single partition then exchange partition to one table which is not having partition.
My question is how efficiently this partition merge is with huge data volume ?

Answer 1

Hello,
I wonder why are you using Bulk Collect, when the same can be accomplished by a simple Merge statement.
Below can help:
MERGE INTO hotels tgt USING
(SELECT hotel_code,
  hotel_name,
  hotel_type,
  hotel_address,
  hotel_number,
  hotel_facility
FROM bck_hotel
) src ON (src.hotel_code = tgt.hotel_code)
WHEN MATCHED THEN
  UPDATE
  SET tgt.hotel_name   = src.hotel_name,
    tgt.hotel_type     = src.hotel_type,
    tgt.hotel_address  = src.hotel_address,
    tgt.hotel_number   = src.hotel_number,
    tgt.hotel_facility = src.hotel_facility WHEN NOT MATCHED THEN
  INSERT
      tgt.hotel_code,
      tgt.hotel_name,
      tgt.hotel_type,
      tgt.hotel_address,
      tgt.hotel_number,
      tgt.hotel_facility
    VALUES
      src.hotel_code,
      src.hotel_name,
      src.hotel_type,
      src.hotel_address,
      src.hotel_number,
      src.hotel_facility
    );Is it not true?
Regards,
P.