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This Idea is a duplicate of https://ibm-ai-apps.ideas.ibm.com/ideas/MASM-I-813.
For SQL Server a default constraint is utilized so the database platform populates it on existing columns and then the constraint is dropped after. Oracle/DB2 syntax is different (you set a default on the column instead of a constraint) but I'd imagine the performance of that would be faster then executing a bulk update. Similarly after you would then need to drop the default.