On Wed, Jan 16, 2019 at 02:14:41PM +0100, Peter Eisentraut wrote:
> On 15/01/2019 08:13, Michael Paquier wrote:
>> When testing a bulk INSERT into a table which has a stored generated
>> column, memory keeps growing in size linearly, which does not seem
>> normal to me. If inserting more tuples than what I tested (I stopped
>> at 10M because of lack of time), it seems to me that this could result
>> in OOMs. I would have expected the memory usage to be steady.
>
> What are you executing exactly? One INSERT command with many rows?
Yes, something like that grows the memory and CPU usage rather
linearly:
CREATE TABLE tab (a int, b int GENERATED ALWAYS AS (a * 2) STORED);
INSERT INTO tab VALUES (generate_series(1,100000000));
--
Michael
