Oracle SQL - 使用 expdp/impdp 将数据从非分区（常规表）导入空分区表

Question

Oracle version - 12.2.0.1 OS version - 7.1 Exadata box.

I have a table with 5 million rows into a regular table (non-partitioned) and my client has created an empty structure of the above table (partitioned by date). Now, he wants to export(expdp) the data from original table (non-partitioned) and import (impdp) into the partitioned table and wants the data to go into the partitions accordingly. Is this achievable?

Please let me know if this is achievable through any method?

Thank you,

Answer 1

A normal datapump with TABLE_EXISTS_ACTION=APPEND will take care of it assuming the table has already been created in the target schema.

If you have a table that is already loaded and is unpartitioned, there is the 'alter table' option as mentioned, which lets you define the partitionined schema for both table and indexes, and do it online

SQL> alter table T modify
  2  partition by range (object_id) interval (10000)
  3  (
  4    partition p1 values less than (20000)
  5  ) online
  6  update indexes
  7  ( ix  local,
  8    ix2 global partition by range (created)
  9    (
 10      partition ix2_p1 values less than (date '2016-08-01'),
 11      partition ix2_p2 values less than (maxvalue)
 12    )
 13  );

Table altered.

Answer 2

I'm confused, you use the tag oracle10g, but mention 12.2 in the question?

Yes, this will work, on two conditions:

1. It is clear into which partition each row will be sorted. Unless you use system partitioning ( PARTITION BY SYSTEM ), that should be fine.

2. All the necessary partitions do exist. Either your client uses interval partitions (for instance PARTITION BY RANGE (my_date) INTERVAL (NUMTOYMINTERVAL(1,'MONTH')) ), or they set up partitions to cover all dates in the unpartitioned table.