From: Rodrigo Rosenfeld Rosas <rr.rosas@gmail.com>
To: pgsql-performance@lists.postgresql.org
Subject: Extremely slow DELETE with cascade foreign keys
Date: Tue, 5 Dec 2017 14:21:38 -0200
Message-ID: <8f569ed9-fde9-1fe7-4beb-01945009e040@gmail.com> (raw)
Hi, I think something changed recently in my development environment as
I don't recall deletes being so slow before.
I've created a new dump and restored to a new database, ran VACUUM FULL
ANALYSE and a simple delete takes forever as you can see here:
explain analyze delete from field_values where transaction_id=226;
QUERY PLAN
---------------------------------------------------------------------------------------------------------------------------------------------------------------
Delete on field_values (cost=0.43..257.93 rows=481 width=6) (actual
time=367375.805..367375.805 rows=0 loops=1)
-> Index Scan using index_field_values_on_transaction_id on
field_values (cost=0.43..257.93 rows=481 width=6) (actual
time=0.223..4.216 rows=651 loops=1)
Index Cond: (transaction_id = 226)
Planning time: 0.234 ms
Execution time: 367375.882 ms
(5 registros)
Time: 367377,085 ms (06:07,377)
Any ideas on what could be causing this? Could it be an issue with my
hard drive?
There aren't that many records to delete from the other tables
referencing field_values. I've done this sort of operation earlier this
year and it was quite fast. Any clues?
Thanks in advance,
Rodrigo.
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Subject: Re: Extremely slow DELETE with cascade foreign keys
In-Reply-To: <8f569ed9-fde9-1fe7-4beb-01945009e040@gmail.com>
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