Database Index Tutorial - Search Videos

How Databases Actually Find Your Data — Why Indexes Matter

YouTubeDmitry Finashkin

How Databases Actually Find Your Data — Why Indexes Matter

You write a SQL query. SELECT * FROM users WHERE id = 42. Simple, right? But behind that one line, the database makes a decision that determines whether your query takes 1 millisecond — or 500. The difference is whether you have an index. This video visualizes what databases actually do when they look up your data. With and without indexes ...

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