# Database Engine

### Configuring Cereal

Inside your servers `/plugins/SVCommonsLib` directory, you'll find `cereal.json` which can be used to configure the databases of all plugins on the server. In the future it will be possible to utilize different databases on a pre-plugin bases, but for our first implementation we've limited it to one shared instance. 

```json
{
  "mode": "FILE", // Also supports MongoDB
  "nodeId": "c88272c9-f0e1-4b99-8df5-3d138e6d6bd7",
  "mongoDBConfig": {
    "uri": "",
    "database": ""
  },
  "fileConfig": {},
  "cacheConfig": {
    "expireAfterAccessMinutes": 60,
    "expireAfterWriteMinutes": 60
  },
  "debug": true
}
```

Only a few of the above config variables need special attention,

### Special Config Options

`mode` - Currently supports `FILE` and `MONGO`with plans to support MySQL, SQLite, and Postgres in the coming months.

`debug` - Enables debug logging for caches and data sources.

`cacheConfig` - This is used to change how long specific items are kept in memory before being freed. These values are in milliseconds, and its recommend they are set between 5 and 15 minutes but every server is different. If peoples are only online for a short time before logging of for a long time, the value should be lower. 

`nodeId` - This value should never be changed. Its used to distinguish servers which share data between each other. This value is assigned and maintained by the plugin.

{% hint style="info" %}
If you need help with any of the other config variables, or have questions, please open a support ticket in our [Discord.](https://guccidev.us/discord)
{% endhint %}


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