Sahil Walia · Software Engineering Radio - the podcast for professional software developers · Sahil Walia on Schema Changes and Data Migrations
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state that adding a nullable column is a safe schema change even with downstream consumers
“One column had less than 2 percent of the values populated, and it was initially assumed those don't bring value, but later it was realized ... downstream jobs started breaking”
“If you have a risk register now, you could think of adding a column called Opportunities.”
“You will write ahead logs in Postgres or binlog in MySQL… replay the changes into a new system when the new schema… essentially zero application code changes.”
“I made a column of all the worst things that could happen… then a column for how to minimize each… then a column for how to get back quickly”
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