Backend
Database Index
A data structure that improves the speed of data retrieval operations on a database table.
Why it matters
- Dramatically speeds up query performance
- Essential for scaling database operations
- Can make or break application performance
When to use
- On columns frequently used in WHERE clauses
- On columns used for sorting or joining
- When query performance is slow
Common mistakes
- Creating too many indexes, slowing writes
- Not indexing columns used in queries
- Creating indexes that are never used
Related terms
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