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PlanetScale Blog
What are the disadvantages of database indexes?
If you've worked with databases for a while, you've probably learned that adding indexes can improve performance. This is especially true for large tables when you are querying with JOINs, GROUP BY, WHERE, or ORDER BY clauses. An index basically works by storing a copy of part of the data in a different order, so that it can be accessed more quickly — kind of like adding a table of contents to a book. For a more detailed explanation of how indexes work and how you can use them, check out this ar
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