#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 ambivalentno):
Regarding timings:
InnoDB table with 2 mln entries (but lots of big TextFields).
It takes ~3 hours to add a single field, and also ~3 hours to add multiple
fields in case they're grouped via single sql statement. Actually, most of
time it takes to perform a migration mysql copies data to temporary table.
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Ticket URL: <https://code.djangoproject.com/ticket/24203#comment:11>
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