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Add "Seeding an empty database" section

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Michael Kozono 2019-02-20 20:08:03 +00:00
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doc/development/performance.md
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@ -410,6 +410,21 @@ there's nothing stopping somebody from doing this elsewhere in the code:
SOME_CONSTANT = 'bar'
```
## How to seed a database with millions of rows
You might want millions of project rows in your local database, for example,
in order to compare relative query performance, or to reproduce a bug. You could
do this by hand with SQL commands, but since you have ActiveRecord models, you
might find using these gems more convenient:
- [BulkInsert gem](https://github.com/jamis/bulk_insert)
- [ActiveRecord::PgGenerateSeries gem](https://github.com/ryu39/active_record-pg_generate_series)
### Examples
You may find some useful examples in this snippet:
https://gitlab.com/gitlab-org/gitlab-ce/snippets/33946
[#15607]: https://gitlab.com/gitlab-org/gitlab-ce/issues/15607
[yorickpeterse]: https://gitlab.com/yorickpeterse
[anti-pattern]: https://en.wikipedia.org/wiki/Anti-pattern