Poor performance when deleting from entity-attribute-value type master-table - Mailing list pgsql-performance

From Andreas Joseph Krogh
Subject Poor performance when deleting from entity-attribute-value type master-table
Date
Msg-id VisenaEmail.6a.6ef5c9caf9b77096.14b702ca7f3@tc7-visena
Whole thread Raw
Responses Re: Poor performance when deleting from entity-attribute-value type master-table  (Igor Neyman <ineyman@perceptron.com>)
Re: Poor performance when deleting from entity-attribute-value type master-table  (Jerry Sievers <gsievers19@comcast.net>)
List pgsql-performance
Hi all.
 
Using PG-9.4.0 I'm seeing this trying to delete from an "entity"-master table:
 
*# explain analyze     delete from onp_crm_entity where entity_id IN (select tmp.delivery_id from temp_delete_delivery_id tmp);
                                                                    QUERY PLAN                                                                     
---------------------------------------------------------------------------------------------------------------------------------------------------
 Delete on onp_crm_entity  (cost=0.43..5673.40 rows=1770 width=12) (actual time=7.370..7.370 rows=0 loops=1)
   ->  Nested Loop  (cost=0.43..5673.40 rows=1770 width=12) (actual time=0.050..1.374 rows=108 loops=1)
         ->  Seq Scan on temp_delete_delivery_id tmp  (cost=0.00..27.70 rows=1770 width=14) (actual time=0.014..0.080 rows=108 loops=1)
         ->  Index Scan using onp_crm_entity_pkey on onp_crm_entity  (cost=0.43..3.18 rows=1 width=14) (actual time=0.010..0.011 rows=1 loops=108)
               Index Cond: (entity_id = tmp.delivery_id)
 Planning time: 0.314 ms
 Trigger for constraint onp_crm_activity_entity_id_fkey: time=4.141 calls=108
 Trigger for constraint ...
 Trigger for constraint ...
 Trigger for constraint ...
 
 
I have lots of tables referencing onp_crm_entity(entity_id) so I expect the poor performance of deleting from it is caused by all the triggers firing to check FKI-constraints.
 
Are there any ways around this or do people simply avoid having FKs in schemas like this?
 
Thanks.
 
--
Andreas Joseph Krogh
CTO / Partner - Visena AS
Mobile: +47 909 56 963
Attachment

pgsql-performance by date:

Previous
From: Tom Lane
Date:
Subject: Re: Avoiding Refreezing XIDs Repeatedly
Next
From: Gavin Flower
Date:
Subject: Re: Survey: Max TPS you've ever seen