How many records should there be before I consider indexing my sql tables?
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There’s no good reason to forego obvious indexes (FKs, etc.) when you’re creating the table. It will never noticeably affect performance to have unnecessary indexes on tiny tables, and it’s good to take a first cut when your mind is into schema design. Also, some indexes serve to prevent duplicates, which can be useful regardless of table size.
I guess the proper answer to your question is that the number of records in the table should have nothing to do with when to create indexes.