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- A 2U employee must create a Data Platform 1-off request to ensure that there will be no complications due to losing the table (e.g. financial data, or otherwise), and to determine the follow-up required.
- This must happen before removing the actual tables in 2U Production.
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TWO releases (after pre-requirements):
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When using AWS Aurora, a nullable column can be added to existing large (100k rows+?) tables without causing downtime. However, the migration may still timeout in GoCD - so please coordinate the release with SRE.
- Make a new field addition in model with null=True.
- Generate the model-change migrations locally.
- Create a pull request containing the model change and newly-generated migrations.
- Merge the migration pull request.
- The release process will run the migration and add the nullable column to table.
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On AWS Aurora, indexes can be build on large tables without causing downtime, but this requires SRE coordination as the migration may timeout in GoCD.
- Add the new index on model fields.
- Generate the model-change migrations locally.
- Make pull request containing the model change and newly-generated migrations.
- Merge the migration pull request.
- Release will run the migration and add the index to table.
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