What are some tips for SQL indexing?
To optimize your SQL queries, consider these indexing tips: 1. Use the right index type (B-tree, hash, etc.). 2. Index columns used in WHERE clauses. 3. Avoid over-indexing, as it can slow down write operations.
How do I decide which columns to index?
Focus on columns that are frequently used in search conditions, JOINs, and ORDER BY clauses. Analyze query performance to identify bottlenecks.
What is the impact of indexing on performance?
Indexing can significantly speed up read operations by allowing the database to find data faster. However, it can slow down write operations due to the overhead of maintaining the index.
Can you explain the difference between clustered and non-clustered indexes?
A clustered index determines the physical order of data in a table, while a non-clustered index is a separate structure that points to the data. You can have only one clustered index per table.
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