How to handle new partitions in a smart automatic manner in PostgreSQL ?

I want to create a PostgreSQL table List partition on a certain column. For example:

  id            int ,
  country_code  VARCHAR,
  order_total   int,
) PARTITION BY LIST (country_code)

however I dont know all the possible counties in advance, on an oracle table I will enable auto partitioning:


It seems like PostgreSQL lacks this feature, I have read that I can add a default partition to the table and then later on add another partition and the values from the default partition would be transferred automatically to the new partition. (EDIT: default partition block you from creating new partitions if you previously inserted values to it)

what would be the best strategy to handle this in an automatic manner ? Are there any plans to add this feature to PostgreSQL?

  • I have created an external script as adding a trigger before/update on the default partition would slow down the insertion. So the script runs every month as I have partitioned for each month and then it checks the records which are there in default partition.I admit there are many steps to ensure. I wish it would have been easier but it works
    – Freedom911
    May 10, 2021 at 13:24

1 Answer 1


I haven't heard of any plans to add such a feature.

You can easily create a BEFORE INSERT trigger that creates partitions on demand, but of course that trigger has to run for each row inserted, which means a certain performance impact.

Using a default partition like you suggest is a solution with better performance, but it requires later explicitly moving the data to a different partition, which can be painful.

If you expect new countries to pop up all the time, maybe the trigger is the way to go. If it happens once in a blue moon, I might prefer the second way.

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