Interpreting the Execution Plan
The execution plan can be difficult to read at first, but with some practice, you can learn to interpret it effectively. Here are some of the most important columns in the execution plan table:
id: This is a unique identifier for each step in the execution plan. The id column is used to show the order in which the steps will be executed.
select_type: This column describes the type of SELECT statement that is being executed. There are several possible values for this column, including SIMPLE, PRIMARY, SUBQUERY, and UNION.
table: This column shows the name of the table that is being accessed.
type: This column shows the type of access that is being used to access the table. There are several possible values for this column, including ALL, index, range, and ref.
possible_keys: This column shows the indexes that could potentially be used to access the table.
key: This column shows the index that is actually being used to access the table.
rows: This column shows the number of rows that will be examined for each step in the execution plan.
Using the information in the execution plan, you can identify areas where you can optimize your query. For example, if you notice that the optimizer is performing a full table scan instead of using an index, you may want to consider adding an index to the table.
CONCLUSION
The execution plan is a powerful tool that can help you optimize the performance of your MariaDB queries. By analyzing the plan, you can identify areas where you can improve the efficiency of your queries, resulting in faster and more responsive database applications. If you are new to MariaDB, it is highly recommended that you spend some time learning how to use the execution plan, as it can be an invaluable resource for optimizing your database queries.
Top comments (0)