What are some common SQL performance mistakes?
An example of an AI chatbot conversation about common SQL performance mistakes.
What are some common SQL performance mistakes I should avoid?
Some common SQL performance mistakes include using SELECT *, not indexing properly, and writing inefficient joins.
Can you explain why using SELECT * is a bad practice?
Using SELECT * retrieves all columns, which can lead to unnecessary data transfer and slower performance. It's better to specify only the columns you need.
What about indexing? How can it affect performance?
Indexing can significantly speed up data retrieval. However, over-indexing can slow down write operations, so it's important to find a balance.
Are there any tools to help analyze SQL performance?
Yes, tools like SQL Server Profiler, EXPLAIN in PostgreSQL, and various APM tools can help analyze and optimize SQL performance.
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