#24203: Optimisation: adding multiple fields to same model should attempt to run
single ALTER TABLE statement
-------------------------------------+-------------------------------------
Reporter: Peter Lauri | Owner: nobody
Type: | Status: new
Cleanup/optimization |
Component: Migrations | Version: dev
Severity: Normal | Resolution:
Keywords: migration | Triage Stage:
| Someday/Maybe
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by Pratyush Mittal):
Yeah, clubbing will save multiple `copy to tmp table` steps on large
tables.
I have a MySQL table with ~20mln rows. I increased the decimal places for
6 columns. This took 45 minutes which would have taken 5 minutes if the
alter statements were clubbed.
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Ticket URL: <https://code.djangoproject.com/ticket/24203#comment:19>
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