Answer
Migrations are performed safely using batch updates or tools like Mongock, with applications supporting both old and new versions temporarily.
Quick Answer
MongoDB supports schema evolution via its flexible document model - add new fields without migrating existing documents. Strategies: use schema versioning field (add "schemaVersion: 2" to documents and handle both versions in code), lazy migration (upgrade documents on first read/write), bulk migration scripts for breaking changes. Schema validation can be updated live with collMod.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ