php - Basic mysql optimizations -

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i'm new mysql. hit scaling problem queries taking as 15 seconds solve on simulations when added 7k accounts.

7k isn't much. so, got few questions.

what tradeoff between making 1 big query database (multiple joins reqd) , multiple smaller queries(which require no joins)?

also, (this basic) select * work slower select <column> because more columns returned caller (php)?

thanks.


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