Tag: database

MySQL Table Size

Posted on by Andrew Minion

Ever wondered which database or tables are taking up disk space on a MySQL/MariaDB server?

This query will provide the size of each table:

SELECT TABLE_SCHEMA AS `Database`,
TABLE_NAME AS `Table`,
ROUND(((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024), 2) AS `Size (MB)`,
ROUND((data_free / 1024 / 1024), 2) AS `Reclaimable Size (MB)`
FROM information_schema.TABLES
-- WHERE `TABLE_SCHEMA` = 'database_name'
ORDER BY (DATA_LENGTH + INDEX_LENGTH) DESC;

Database Platform Comparisons for Laravel Feature Tests

Posted on by Andrew Minion

TL;DR: MySQL significantly outperforms MariaDB in my automated test suite.

The Problem

This Twitter thread prompted me to do a bit of research on database platforms for Laravel automated tests.

I’ve recently been building an ecommerce app based on Laravel. Partway through development, we added geometry fields to a couple of tables in order to determine distances. I’ve been using this spatial package, so SQLite was not an option for my test suite.

As soon as I switched the testing database driver from SQLite to MariaDB, my tests immediately took an extra 12–13 seconds to run, regardless of whether I ran the entire test suite, a single file, or just one test.

This significantly lengthened the feedback loop when making changes to code and re-running tests.

So when I saw Jack Ellis mention that he uses MySQL for his test suite, it made me curious if he had the same issue.

He said that one of his test files runs 39 tests in < 2 seconds, so apparently it’s not been a problem for him.

Context

  • I’m using the LazilyRefreshDatabase trait added in Laravel 8.62.0 on my entire test suite
  • I’m using squashed migrations
  • Many of my tables have constrained foreign keys referencing other tables

Comparisons

I decided to do some digging; here are comparisons using four different platforms for the same test in my application.

MariaDB

I’ve been using MariaDB as the main database platform on my development machine for years. Currently I’m on version 10.6.4.

  • A single test took 14s to run
  • An entire file with 16 tests took 19s to run

In-Memory SQLite Database

I temporarily disabled the geometry features and tried the in-memory SQLite database (DB_CONNECTION=:memory:); it performed much better for the same tests:

  • A single test too <1s to run
  • An entire file with 16 tests took ~7s to run

SQLite File Database

I then tried with an SQLite file (DB_CONNECTION=sqlite), and it performed about the same:

  • A single test took ~1s to run
  • An entire file with 16 tests took ~7s to run

MySQL 8

I have an installation of MySQL 8 set up for one app that uses some specific MySQL 8 and I figured why not give that a try too.

Here are the results:

  • A single test took ~1.5s to run
  • An entire file with 16 tests took ~6.5s to run

Summary

For some reason, MariaDB takes approximately 12–13 seconds to tear down and recreate the database before starting to run tests, but MySQL is much faster.

While testing MariaDB, I opened the raw data directory for the database, and noticed chunks of files being removed and recreated at a time, so perhaps the foreign key constraints are (part of) the culprit here.

I do have 77 databases with ~3800 tables in my MariaDB installation built up from various projects over the years. It seems unlikely, but theoretically possible, that the server size could be part of the problem too.

I think I’ll experiment with switching back to MySQL as my development platform of choice.

Have you run into this same issue? Have any tips or tricks? Let me know in the comments.