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Use Explain / Explain Extended to understand what indices are available to MySQL and which one it actually selects. MySQL will only use ONE key per query . EXPLAIN EXTENDED SELECT * from Table WHERE Something='ABC'
4 sty 2023 · In the following steps, you’ll create indexes of different types for a range of scenarios. You’ll learn how to verify if the indexes are used in a query. Finally, you’ll learn to remove indexes if necessary. Using Single-Column Indexes
MySQL uses indexes to rapidly locate rows with specific column values. Without an index, MySQL must scan the entire table to find the relevant rows. The larger the table, the slower the search becomes.
10.3.1 How MySQL Uses Indexes. Indexes are used to find rows with specific column values quickly. Without an index, MySQL must begin with the first row and then read through the entire table to find the relevant rows. The larger the table, the more this costs.
12 sty 2024 · Throughout this tutorial, you’ve learned essential concepts that can significantly enhance your database performance, from single-column to unique indexes. You’ve covered vital aspects of leveraging MySQL indexes effectively, including optimizing them by listing and deleting indexes.
17 cze 2024 · By following best practices such as identifying high-volume queries, choosing appropriate index columns avoiding over-indexing and regularly monitoring and optimizing indexes we can significantly enhance the efficiency and responsiveness of the MySQL database.
This tutorial shows you how to use the MySQL USE INDEX hint instruct the query optimizer to use only a list of named indexes for a query.
