PHP Classes

LSM Explain Plan: Show a MySQL query execution plan and performance

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2005-05-21 (12 years ago) RSS 2.0 feedStarStar 35%Total: 879 All time: 3,876 This week: 631Up
Version License PHP version Categories
lsmexplain_plan 1.0GNU General Publi...3Databases, Performance and optimization
Description Author

This class can retrieve the explanation of the execution of a given MySQL database SELECT query and compute a relative performance factor.

The class executes an EXPLAIN query to retrieve the information about the tables, columns, indexes and search methods involved in a SELECT query.

It uses the retrieved information to compute a relative performance factor that is presented in a simple report along with other details pertaining to the execution plan of the query.


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April 2005

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When it is necessary to improve the performance of database applications, the developers often evaluate the SQL queries that are executed, so they can determine how to make the applications run faster.

MySQL has a SQL command named EXPLAIN that lets the developers see which tables, columns, indexes are involved in an SELECT query. Then they can consider eventual database changes that can make the query execute faster.

This class uses the information returned by the EXPLAIN command and computes a performance factor that can be used to easily determine if the changes in the query statement or in the database tables and indexes that are tried effectively lead to performance improvements.

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  • sql.jpg
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Plain text file LSMexplain_plan.class.php Class Executes a explain in a SQL statement

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