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feat: document database distribution selection (MySQL vs MariaDB) #2

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feat: document database distribution selection (MySQL vs MariaDB) #2

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17 changes: 15 additions & 2 deletions references/env-variables.md
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Original file line number Diff line number Diff line change
Expand Up @@ -13,8 +13,8 @@
| `PHP_XDEBUG_3` | `1` | Use Xdebug 3 |
| `NODE_VERSION` | varies | Node.js version |
| `COMPOSER_VERSION` | `2` | Composer version |
| `MYSQL_DISTRIBUTION` | `mariadb` | mariadb or mysql |
| `MYSQL_DISTRIBUTION_VERSION` | varies | Database version |
| `MYSQL_DISTRIBUTION` | `mariadb` | `mariadb` or `mysql` — switches the DB engine |
| `MYSQL_DISTRIBUTION_VERSION` | varies | Database image tag (e.g. `11.4`, `8.4`) |

## Service Toggles

Expand Down Expand Up @@ -43,3 +43,16 @@
| `RABBITMQ_VERSION` | 4.1 |
| `OPENSEARCH_VERSION` | 3.3 |
| `NODE_VERSION` | 20 |

## Database Distribution

Default is MariaDB. To switch to MySQL:

```
MYSQL_DISTRIBUTION=mysql
MYSQL_DISTRIBUTION_VERSION=8.4
```

**Drupal and CakePHP** use different variable names: `DB_DISTRIBUTION` and `DB_DISTRIBUTION_VERSION` (same values).

Switching distributions on an existing environment requires exporting data first — volumes are not compatible between MariaDB and MySQL.
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