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I’ve been a MySQL DBA for 20 years.
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There is a new type of job showing up.
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You moved your production MySQL to Aurora.
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Most people, when asked what a database does, say something like: “it stores data.”
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You added a foreign key constraint when you designed the schema, verified referential integrity, and moved on.
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You’ve set binlog_format=ROW and binlog_row_image=FULL.
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You’ve planned the schema change.
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You run ALTER TABLE orders MODIFY COLUMN status VARCHAR(100) on your production table.
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You need to add a column to a 500-million-row production table.
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You’ve probably been there: running ALTER TABLE users ADD COLUMN email VARCHAR(255) on a production table, expecting it to take a few seconds, and watching it lock the table for 20 minutes instead.