DNS experts recommend lowering TTLs before planned changes, not keeping them permanently short

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A technical analysis recommends using long DNS Time-To-Live values for marketplace tenant subdomains and lowering them only a day before planned cutovers. Permanent short TTLs force resolvers to perform extra work daily for agility only needed during rare changes, while resolvers treat TTLs as advisory anyway. This approach balances steady-state cache efficiency with operational flexibility during migrations. The guidance applies differently depending on whether the marketplace controls the domain or the customer does.

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