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MySQL Stored Procedure Programming by Steven Feuerstein, Guy Harrison

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Conclusion

In this chapter we looked at the particular performance characteristics of stored programs and offered advice about when to use stored program logic in place of “straight” SQL and how to optimize the algorithms we write in the MySQL stored program language.

As we have emphasized repeatedly, the performance of most stored programs will depend primarily on the performance of the SQL statements found within the stored program. Before optimizing stored program statements, make sure that all of the SQL statements are fully optimized.

The MySQL stored program language is currently slower than most alternative procedural languages—such as Java and PHP—when it comes to number crunching. In general, we are better off implementing computationally expensive code in one of these other languages.

Stored programs can, however, really shine from a performance standpoint when a relatively small output is calculated from a large number of database rows. This is because other languages must transfer these rows across the network, while stored program execution occurs inside the database, minimizing network traffic.

Sometimes stored programs can also be used as an alternative to hard-to-optimize SQL. This will typically be true when the SQL language forces we to repetitively fetch the same data, or when the SQL logic is enormously complex and we need to “divide and conquer.” However, a stored program solution will typically take more programming investment than a SQL equivalent, so we must ...

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