#24203: Optimisation: adding multiple fields to same model should attempt to run
single ALTER TABLE statement
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Reporter: peterlauri | Owner: nobody
Type: | Status: new
Cleanup/optimization |
Component: Migrations | Version: master
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
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Comment (by simonpercivall):
Replying to [comment:2 timgraham]:
> Could you give some performance numbers for comparison?
I can give performance numbers for a MySQL installation.
Doing an ALTER TABLE on a table with 120 columns and containing approx.
20M rows takes 2–3 hours. Combining several ALTER TABLES into one takes no
longer time.
The simple math here is that three Django migrations would take 6–9 hours,
whereas the combined version would take 2–3 hours.
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Ticket URL: <https://code.djangoproject.com/ticket/24203#comment:5>
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