I can either have an auto increment id field as my primary key or a sha1 hash.
Which one should I choose?
Which would be better in terms of performance?
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I can either have an auto increment id field as my primary key or a sha1 hash.
Which one should I choose?
Which would be better in terms of performance?
Almost definitely an auto incrementing integer. It will be faster to create, faster to search, and smaller. Consider for example if you had another table that referenced it. Would you want it to reference it via an integral primary key or via a sha1 hash? An integer would be more meaningful (in a way), and it would be much (much!) more efficient.