Player data in one line
Annotate a class and the connector loads, caches and saves it. Schema changes are handled for you.
In development · early access opening soon
The database built for Minecraft.
One server for player data, leaderboards, cross-server messaging and your website. LeonsDB replaces the MySQL + Redis setup with a single install, and stops server-switch dupes at the database level.
@PlayerData(namespace = "practicepvp", collection = "stats")
public class Stats {
@Indexed public int kills;
public int deaths;
@Transactional public double coins;
}
Stats stats = LeonsDB.player(player).get(Stats.class);
// instant: read from the local cache
stats.kills++;
// merged with other changes, saved in the background
No SQL to write
No connection pools
No main-thread lag
No Redis to run
No server-switch dupes
Everything a Minecraft network needs from its data
General-purpose databases don't know what a player is. LeonsDB is built around how plugins actually use data.
The main thread never waits
Online players' data lives in memory on your server. Reads are instant; writes are merged and sent in the background.
Dupe protection built in
Only one server can own a player's data at a time. Late writes from a lagging or crashed server are refused.
Leaderboards for free
Mark a field @Indexed and get instant top-N lists and "rank of player X", always up to date.
Money that can't duplicate
Transfers between players are atomic, across servers and through crashes. Coins are never created or lost.
Replaces Redis
Cross-server messaging and "tell me when this changes" notifications, from the database you already run.
Your data on your website
A built-in HTTP and WebSocket API with per-field permissions feeds websites, Discord bots and stores directly.
Undo for your database
See or restore any player's data at any point in time. Roll back a dupe or an exploit in one command.
What happens when a player gets a kill
Fast where it can be, careful where it has to be.
- Your plugin changes the field.
stats.kills++updates the copy in memory. Nothing touches the network or the disk on the main thread. - The connector merges changes. Forty kills in a second become one "kills +40" operation instead of forty writes.
- It is sent in the background. About once a second, when the player leaves, and on shutdown. Money fields marked
@Transactionalgo immediately. - LeonsDB stores it durably. The server only confirms a write once it is on disk. A confirmed write survives crashes and power cuts.
The server-switch dupe, solved where it starts
The classic dupe happens when two servers both think they own a player and both save. LeonsDB makes that impossible.
lobby-1saves the player's latest data, then releases ownership
LeonsDBhands ownership to the next server with a new, higher epoch
survival-2loads the data, already warmed up before the player arrives
lobby-1a late save after a lag spike carries the old epoch, so it is rejected
One product instead of three
| MySQL + Redis + custom backend | LeonsDB | |
|---|---|---|
| Setup | Three services, schemas, connection pools, a web backend | One install, schemas from your Java classes |
| Reads during gameplay | Network round trip unless you write your own cache | Local memory, cache included |
| Stat updates | One query per change, or your own batching code | Merged automatically |
| Server-switch dupes | Your problem | Prevented by ownership and epochs |
| Leaderboards | Sorting queries or a Redis sorted set to keep in sync | Built-in sorted indexes |
| Cross-server messages | Redis pub/sub | Built in |
| Website and Discord access | Write and host an API | Built-in HTTP and WebSocket API |
| Restore a player's data | Restore a whole backup | Any player, any point in time |
Performance numbers will be published with open, reproducible benchmarks against MySQL and MongoDB before launch.
Open core
The database and the connector are open source and free to self-host, forever.
Connector
Apache-2.0
Use it in any plugin, including paid and closed-source ones. No strings attached.
Server
AGPL-3.0
Free to run on as many machines as you like. A commercial license is available for companies that need one.
Cloud and Pro
Coming later
Hosted LeonsDB with backups, a web dashboard and analytics, for networks that don't want to run it themselves.
Building a network? Get in early.
Early access is opening to a small group of servers and plugin developers. Tell us what you run and what slows you down.
contact@leonsdb.com