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 - [ ] [Understanding Database Sharding](https://www.digitalocean.com/community/tutorials/understanding-database-sharding)
 - [ ] [Data Replication in DBMS](https://www.geeksforgeeks.org/data-replication-in-dbms)
 - [ ] [SQL vs. NoSQL Database: When to Use, How to Choose](https://towardsdatascience.com/datastore-choices-sql-vs-nosql-database-ebec24d56106)
+- [ ] [How do database indexes work?](https://planetscale.com/blog/how-do-database-indexes-work)

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