#31202: Bulk update suffers from poor performance with large numbers of models
and
columns
-------------------------------------+-------------------------------------
Reporter: Tom Forbes | Owner: Tom
Type: | Forbes
Cleanup/optimization | Status: assigned
Component: Database layer | Version: dev
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Hannes Ljungberg):
One suggestion is to use the `UPDATE..FROM`-syntax along with `VALUES` on
backends which supports it. For example:
{{{
UPDATE mytable
SET
mytext = myvalues.mytext,
myint = myvalues.myint
FROM (
VALUES
(1, 'textA', 99),
(2, 'textB', 88),
) AS myvalues (pk, mytext, myint)
WHERE mytable.pk = myvalues.pk
}}}
I know PostgreSQL supports this syntax but I haven't looked into the
others.
--
Ticket URL: <https://code.djangoproject.com/ticket/31202#comment:7>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
--
You received this message because you are subscribed to the Google Groups
"Django updates" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-updates/061.1de51a75a28a10db9970b47b87e02bf5%40djangoproject.com.
