An Inesrt on a partitioned table become very slow - Mailing list pgsql-novice

From Tomer Praizler
Subject An Inesrt on a partitioned table become very slow
Date
Msg-id CAD=kdR9rs+3+NrfTAdA_8gaPfXQg5gt06F_Ddz4dY-WZcOLd5g@mail.gmail.com
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Responses Re: An Inesrt on a partitioned table become very slow
List pgsql-novice
Hey, 

I use Postgres 10.1, and I have the following structure:
Parent table with columns:
range_value: double, timestamp: timestamp, device_id: integer, count:integer

which is partitioned with Partition key: LIST (range_value) which has a value of 1 - 26.
So basically it has 26 child partitions. 

Each one of those partitions it partitioned by range. essentially a daily partition.

This is how the perant_table_with_range_value_1 is conofigured:

Partition of: perant_table FOR VALUES IN ('1')
Partition constraint: ((range_value IS NOT NULL) AND (range_value = ANY (ARRAY['0'::double precision])))
Partition key: RANGE ("timestamp")

At the moment I have 128 days of partitions in each one of the ranged partitioned.
Which means a total of 26 * 128 = 3328 total partitions. 

My problem is that inserts became very slow. 
I used to bulk insert 10000 rows in 6 seconds, now it takes 45 seconds. 

Is this an expected behavior? is there something I missing? 
Thank you!



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