How to Choose Column Order in a MySQL Composite Index
When you add a composite index to a MySQL table, the order of its columns determines which queries can use it efficiently. A composite index is one index…
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How to Find Slow Queries with the MySQL Slow Query Log
When a MySQL database responds slowly, the SQL statements taking the most time are a useful place to investigate. The slow query log records statements that exceed a…
Read articleHow to Insert or Update Rows in MySQL with ON DUPLICATE KEY UPDATE
When you insert a row into a MySQL table, you may need to add it if no row has its key, or update the row that already has…
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