For both MySQL and H2, you will need to place Ledger Databases in your mods folder along with Ledger 1.1.0 or newer
## H2
Add the following to the bottom of your Ledger config file:
```toml
[database_extensions]
h2 = true
```
## MySQL
Add the following to the bottom of your Ledger config file:
```toml
[database_extensions]
mysql = true
url = ""
username = ""
password = ""
```
`url`: Must be URL of database with `/<database_name>` appended. An example URL would be `localhost/ledger`. You can optionally add port information such as `localhost:3000/ledger`