Coach note

Interviewers ask this kind of question to surface how you think, not what you remember. The strongest answers are specific, calmly told, and end on what changed.

SQL · Indexes

You need to add an index to a 500GB table that's heavily used in production. Explain your strategy to minimize downtime and impact on active queries.

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You need to add an index to a 500GB table that's heavily used in production. Explain your strategy to minimize downtime and impact on active queries.

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