How to Monitor the Impact of MySQL Indexing on Query Performance
Q: How can I assess the performance improvements resulting from applying indexes to MySQL tables?
A:
To evaluate the efficacy of indexing, utilize the EXPLAIN EXTENDED query:
EXPLAIN EXTENDED SELECT col1, col2, col3, COUNT(1) FROM table_name WHERE col1 = val GROUP BY col1 ORDER BY col2;
Followed by SHOW WARNINGS;. This provides insight into query performance and index usage.
Additional Tips:
- Implement "covering indexes" by prioritizing columns from the WHERE clause, GROUP BY, ORDER BY, and SELECT clauses when creating an index.
- For instance, with the provided query, a covering index would resemble KEY(col1, col2, col3) to optimize performance.
Caution:
- Keep in mind that excessive indexing can hinder insert query execution speed.
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